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Articles 31051 - 31080 of 34555

Full-Text Articles in Physical Sciences and Mathematics

Low Temperature Spectroscopic And Annealing Studies Of Disordered Organic Solids, Dwayne L. Labrake Jan 1992

Low Temperature Spectroscopic And Annealing Studies Of Disordered Organic Solids, Dwayne L. Labrake

Dissertations

No abstract provided.


Spin Label Studies Of Radical Reduction In Normal And Sickle Erythrocyte Membranes Associated With Antioxidants, Yin Zhang Jan 1992

Spin Label Studies Of Radical Reduction In Normal And Sickle Erythrocyte Membranes Associated With Antioxidants, Yin Zhang

Dissertations

No abstract provided.


Lithium Transport, Mg2+ Competition, And Phospholipid Composition In Human Erythrocytes: A Multinuclear Magnetic Resonance Study, Aida Abraha Jan 1992

Lithium Transport, Mg2+ Competition, And Phospholipid Composition In Human Erythrocytes: A Multinuclear Magnetic Resonance Study, Aida Abraha

Dissertations

No abstract provided.


Multinuclear Magnetic Resonance Study Of Chlorine And Cesium Ion Distribution In Human Erythrocyte Suspensions, Lisa Wittenkeller Jan 1992

Multinuclear Magnetic Resonance Study Of Chlorine And Cesium Ion Distribution In Human Erythrocyte Suspensions, Lisa Wittenkeller

Dissertations

No abstract provided.


Improved Recovery Of A Radlolabeled Peptide With An Albumin-Treated Reversed-Phase Hplc Column, David S. Hage, Robert L. Taylor, Pai C. Kao Jan 1992

Improved Recovery Of A Radlolabeled Peptide With An Albumin-Treated Reversed-Phase Hplc Column, David S. Hage, Robert L. Taylor, Pai C. Kao

David Hage Publications

Reversed-phase high-performance liquid chromatography (RP-HPLC) is an important tool in the purification of radiolabeled peptides and proteins for immunoassay. However, for some proteins and peptides it is difficult to achieve reproducible behavior in RP-HPLC because of the low recovery of these compounds. Factors that can be varied to improve recovery include the strength or pH of the mobile phase, the chain length and spacing of groups on the reversed-phase support, and the flow rate or steepness of the elution gradient (1-5). ... In summary, we obtained better recovery and more reproducible chromatographic behavior for labeled 1-34 PTHrP with an albumin-pretreated …


The Eukaryotic Initiation Factor 2-Associated 67-Kda Polypeptide (P67) Plays A Critical Role In Regulation Of Protein Synthesis Initiation In Animal Cells, Manas K. Ray, Bansidhar Datta, Arup Charkraborty, Ansuman Chattopadhyay, Susanne Meza-Keuthen, Naba K. Gupta Jan 1992

The Eukaryotic Initiation Factor 2-Associated 67-Kda Polypeptide (P67) Plays A Critical Role In Regulation Of Protein Synthesis Initiation In Animal Cells, Manas K. Ray, Bansidhar Datta, Arup Charkraborty, Ansuman Chattopadhyay, Susanne Meza-Keuthen, Naba K. Gupta

Chemistry Department: Faculty Publications

The eukaryotic initiation factor 2 (eIF-2)- associated 67-kDa polypeptide (p67) isolated from reticulocyte lysate protects the eIF-2 α subunit from eIF-2 kinase-catalyzed phosphorylation and promotes protein synthesis in the presence of active eIF-2 kinases. We have now studied the roles of p67 and eIF-2 kinases in regulation of protein synthesis using several animal cell lysates and an animal cell line (KRC-7) in culture under various growth conditions. The results are as follows. (i) Both p67 and eIF-2 kinase(s) are present in active forms in all animal cells under normal growth conditions and p67 …


Characterization And Implementation Of A Continuos Flow Trace Metal Preconcentration System For Inductively Couples Plasma Atomic Emission Spectrometry, Robert N. Sibley Jan 1992

Characterization And Implementation Of A Continuos Flow Trace Metal Preconcentration System For Inductively Couples Plasma Atomic Emission Spectrometry, Robert N. Sibley

Senior Scholar Papers

A continuous flow pre-concentration system for analysis of trace metals in natural waters was characterized and used to determine the copper(II) and lead(II) concentrations in seawater from Penobscot Bay, Maine. Pre-concentrated samples were analyzed by inductively coupled plasma atomic emission spectrometry (ICP-AES). System characterization involved elucidation of the thermodynamic complexation constants, KCu(II) and KPb(II), for Cu(II) and Pb(II) with the pre-concentration column chromatographic material. This was done in aqueous media of known pH and ionic strength. The column contained 8-hydroxyquinoline immobilized on Toyopearl HW-75 fractogel chromatographic resin. The buffer system used for metal binding experiments was an equimolar mixture of …


Partial Characterization Of The Major Lipooligosaccharide From A Strain Of Haemophilus Ducreyi, The Causative Agent Of Chancroid, A Genital Ulcer Disease, William Melaugh, Nancy J. Phillips, A A. Campagnari, R Karalus, B W. Gibson Jan 1992

Partial Characterization Of The Major Lipooligosaccharide From A Strain Of Haemophilus Ducreyi, The Causative Agent Of Chancroid, A Genital Ulcer Disease, William Melaugh, Nancy J. Phillips, A A. Campagnari, R Karalus, B W. Gibson

Chemistry Faculty Publications

The first preliminary structure of a surface lipooligosaccharide from Haemophilus ducreyi has been determined. The major oligosaccharide was released by mild acid hydrolysis and analyzed by liquid secondary ion and tandem mass spectrometry. The mass spectral data combined with composition and methylation analysis yielded the most probable structure; Gal1----4GlcNAc1----3Gal1----4Hep1----6Glc1----( Hep1----2Hep1----)3,4Hep1---- KDO, where the reducing terminal 3-deoxy-D-manno-octulosonic acid (or KDO) exists in an anhydro form. This anhydro species results from the elimination of a phosphate from C-4 of KDO during mild acid hydrolysis. The core heptose trisaccharide consists of L-glycero-D-manno-heptose, but analysis of the peracetylated sugars indicated that the 1,4-linked heptose …


Solid-State Nmr Characterization Of Organics In Cement, Michael A. Janusa Jan 1992

Solid-State Nmr Characterization Of Organics In Cement, Michael A. Janusa

Faculty Publications

Solid-state magic angle spinning nuclear magnetic resonance (MAS NMR) has been applied to cement samples containing water-soluble organics, ethylene glycol, phenol, p­bromophenol and p-chlorophenol. Cement matrix development has been followed by 29Si and27Al NMR, which shows the organics, particularly ethylene glycol, to be promoters of silicate polymerization despite the fact that they reduce the compressive strength of the pastes. 13C NMR shows that phenol is completely ionized in cement pastes, but with substituted phenols in the presence of extra added metal salts, ionization is not always complete. 2H NMR on d5 …


Intact Parathyroid Hormone: Performance And Clinical Utility Of An Automated Assay Based On High-Performance Immunoaffinity Chromatography And Chemiluminescence Detection, David S. Hage, Bob Taylor, Pai C. Kao Jan 1992

Intact Parathyroid Hormone: Performance And Clinical Utility Of An Automated Assay Based On High-Performance Immunoaffinity Chromatography And Chemiluminescence Detection, David S. Hage, Bob Taylor, Pai C. Kao

David Hage Publications

The performance and clinical utility of an automated assay of intact parathyroid hormone (parathyrin, PTH) are evaluated. The method is based on the extraction of PTH from plasma by an HPLC column containing immobilized anti-(44-68 PTH) antibodies. The PTH retained is detected with a postcolumn reactor and use of anti-(1--34 PTH) chemiluminescent-labeled antibodies. The total cycle time of the assay is 6.5 mm per injection after a 1-h incubation.The lower limit of detection for PTH in a 66-pL plasma sample was 0.5 pmol/L based on peak heights and 0.2 pmol/L based on peak areas. Mean analytical recovery for PTH added …


Theoretical Investigatlons Of Olefin Metathesis Catalysts, Thomas R. Cundiari, Mark S. Gordon Jan 1992

Theoretical Investigatlons Of Olefin Metathesis Catalysts, Thomas R. Cundiari, Mark S. Gordon

Mark S. Gordon

An ab initio analysis of the electronic structure of high-valent, transition-metal alkylidenes as models for olefm metathesis catalysts is presented. The catalyst models studied fall into three categories: "new" metathesis catalyst models-tetrahedral M(0Hh(XH)(CH2) complexes; "old" metathesis catalyst models-tetrahedral MCMY)(CH2) complexes and alkylidene-substituted Mo metathesis catalysts, Mo( OHMNH)(=C(H)Z). The effect on the bonding caused by modification of either the metal, ligands, or alkylidene substituents is considered. For the new models the minimum energy structures result from maximum metal d1rligand p11' bonding and minimum competition among the ligands for the same d11' AO. Rotation about the MC axis increases this competition. The …


Nature Of The Transition Metal-Silicon Double Bond, Thomas R. Cundiari, Mark S. Gordon Jan 1992

Nature Of The Transition Metal-Silicon Double Bond, Thomas R. Cundiari, Mark S. Gordon

Mark S. Gordon

The nature of the metal-silicon double bond is investigated using ab initio wavefunctions. Electron correlation is specifically included in the calculations at the FORS-MCSCF (full optimized reaction space multiconfiguration self-consistent field) level of theory. Silylene complexes of the form MSiH2 +,containing metals from the first transition series (M = Sc, Ti, V, Cr, Mn, Fe, Co, and Ni), are chosen for this study. An analysis of the bonding and electronic structure among the silylene complexes is presented. The silylene complexes are compared to representative car bene analogues, MCH2 +, and to CrGeH2 + and CrSnH2+.


High-Valent Transition-Metal Alkylidene Complexes: Effect Of Ligand And Substituent Modification, Thomas R. Cundiari, Mark S. Gordon Jan 1992

High-Valent Transition-Metal Alkylidene Complexes: Effect Of Ligand And Substituent Modification, Thomas R. Cundiari, Mark S. Gordon

Mark S. Gordon

An ab initio investigation into the effects of ligand and substituent modification on the metal-carbon double bond is reported. Prototypical group IVB (Ti, Zr, HO and Group VB (Nb, Ta) alkylidenes are chosen for this study. The MC/LMO/CI (multiconfigurationjlocalized molecular orbital/configuration interaction) procedure is used to examine the electronic structures of these complexes in terms of the prime resonance contributors to the ground-state wave function. The main conclusion drawn from this work is that the intrinsic nature of the metal-carbon double bond can typically be changed only within certain limits by modification of the electronegativity of the ligands (L) and …


A Modular Array To Detect Complex Fragments Produced In Intermediate-Energy Reverse-Kinematics Reactions, W. L. Kehoe, A. C. Mignerey, A. Moroni, I. Iori, Graham F. Peaslee, N. Colonna, K. Hanold, K. Hanold, D. R. Bowman, L. G. Moretto, M. A. Mcmahan, J. T. Walton, G. J. Wozniak Jan 1992

A Modular Array To Detect Complex Fragments Produced In Intermediate-Energy Reverse-Kinematics Reactions, W. L. Kehoe, A. C. Mignerey, A. Moroni, I. Iori, Graham F. Peaslee, N. Colonna, K. Hanold, K. Hanold, D. R. Bowman, L. G. Moretto, M. A. Mcmahan, J. T. Walton, G. J. Wozniak

Faculty Publications

A segmented silicon-silicon-plastic array was constructed for studying complex fragment production in heavy-ion reactions with incident energies of 35–100 MeV/u. The array was designed: (1) to measure the energy, position and charge of fragments with 1≤Z≤Zproj; (2) to have high efficiency for detecting fragments produced in reverse-kinematics reactions; (3) to detect events with two or more fragments; and (4) to have a flexible configuration. Each array telescope consists of a 300 μm Si detector, a 5 mm Si(Li) detector and a 7.6 cm plastic scintillator. The elements of the telescope are held by interconnecting modular packages which allow the telescopes …


New Reaction Conditions For The Synthesis Of Wieland-Miescher Ketone, Jonathan J. Bates Jan 1992

New Reaction Conditions For The Synthesis Of Wieland-Miescher Ketone, Jonathan J. Bates

Presidential Scholars Theses (1990 – 2006)

Natural products chemistry is a very important field of chemistry to chemists, biochemists, and biologists. The ability to synthesize a naturally occurring chemical in the laboratory is necessary for some experiments. Often it is difficult to isolate a large quantity of a compound from its natural source when needed for certain experiments. Established procedures for artificial synthesis of this compound can produce higher yields. Sometimes, the function of a natural product is tested by observing the behavior of analogues in the same biological system. The differences in behavior can be related to differences in structure . Since such analogues are …


Magnetic Properties Of A Novel Iron Carbide Film, Fe₇C₃X Formed In A Glow Discharge, Oran Allan Pringle, Gary J. Long, Fernande Grandjean, Jun L. Li, George C. Hadjipanayis, William Joseph James Jan 1992

Magnetic Properties Of A Novel Iron Carbide Film, Fe₇C₃X Formed In A Glow Discharge, Oran Allan Pringle, Gary J. Long, Fernande Grandjean, Jun L. Li, George C. Hadjipanayis, William Joseph James

Physics Faculty Research & Creative Works

No abstract provided.


Structural Studies Of Rare Earth-Iron Nitrides By Neutron Powder Diffraction, William B. Yelon, George C. Hadjipanayis Jan 1992

Structural Studies Of Rare Earth-Iron Nitrides By Neutron Powder Diffraction, William B. Yelon, George C. Hadjipanayis

Physics Faculty Research & Creative Works

No abstract provided.


Hydration Behavior Of Laser Dye Aerosols Of Mixed Composition Having High Critical Supersaturations, Max B. Trueblood, Donald E. Hagen, Darryl J. Alofs Jan 1992

Hydration Behavior Of Laser Dye Aerosols Of Mixed Composition Having High Critical Supersaturations, Max B. Trueblood, Donald E. Hagen, Darryl J. Alofs

Mechanical and Aerospace Engineering Faculty Research & Creative Works

This Study Concerns Aerosol Particles of Mixed Composition. the Particles Contain a Water Insoluble Core (Polystyrene Latex), Surrounded by a Water Soluble Shell (Various Fluorescent Dyes). a Collison Nebulizer and an Electrostatic Aerosol Classifier Are Used to Prepare the Aerosol; its Critical Supersaturation Spectrum is Measured with a Diffusion Cloud Chamber. Experiments Were Done using Four Different Dyes (Disodium Fluorescein, Sulforhodamine 640, Sulforhodamine B and Rhodamine 560 Chloride) with Five Different Polystyrene Latex Sphere Sizes. the Results Indicate that a Kohler-Type Behavior is Obeyed. This Technique of Putting a Soluble Coating Onto an Insoluble Core is Found to Be a …


Remote Sensing Of On-Road Vehicle Emissions, Donald H. Stedman, Gary A. Bishop, Paul L. Guenther, James E. Peterson, Stuart P. Beaton, Iain F. Mcvey Jan 1992

Remote Sensing Of On-Road Vehicle Emissions, Donald H. Stedman, Gary A. Bishop, Paul L. Guenther, James E. Peterson, Stuart P. Beaton, Iain F. Mcvey

Fuel Efficiency Automobile Test Publications

No abstract provided.


A Casscf Study Of Various Rotamers Of The Hexatriene Radical Cation, Robert J. Cave, Jenifer L. Johnson Jan 1992

A Casscf Study Of Various Rotamers Of The Hexatriene Radical Cation, Robert J. Cave, Jenifer L. Johnson

All HMC Faculty Publications and Research

Results are presented from ab initio calculations on the ground and two low-lying excited states of the hexatriene radical cation in a variety of stable conformations of the electronic ground state of the molecule. We have performed Hartree-Fock geometry optimizations using the STO-3G and 6-31g basis sets and have performed vibrational analyses for all stable conformers in the 6-31G basis. In addition, we have performed geometry optimizations in both basis sets using CASSCF wave functions where the five π electrons are correlated. No new geometrical information is obtained at this level of treatment. Excitation energies to the two lowest-lying doublet …


Multiple Enantioselective Retention Mechanisms On Derivatized Cyclodextrin Gas Chromatographic Chiral Stationary Phases, Alain Berthed, Weiyong Li, Daniel W. Armstrong Jan 1992

Multiple Enantioselective Retention Mechanisms On Derivatized Cyclodextrin Gas Chromatographic Chiral Stationary Phases, Alain Berthed, Weiyong Li, Daniel W. Armstrong

Chemistry Faculty Research & Creative Works

2, 6-Di-O-pentyl-3-O-(trifluoroacetyl) (DP-TFA) derivatized β and γ-cyclodextrlne are able to resolve a wide variety of volatile racemic compounds. The enantiomeric recognition mechanism of these phases was Investigated. The retention behavior of homologous series showed that lengthening the side alkyl chain Increases the retention time but does not affect enantioselectivlty. The thermodynamic parameters, free energy, enthalpy, and the difference In free energy, enthalpy, and entropy between enantiomers were evaluated for 24 enantiomeric pairs. From this data, It appears that the compounds can be arranged In two groups. One group has high values for enthalpy, entropy, free energy, and the corresponding difference …


Thalamic Stroke: Presentation And Prognosis Of Infarcts And Hemorrhages, Wolfgang Steinke, Ralph L. Sacco, J. P. Mohr, Mary A. Foulkes, Thomas K. Tatemichi, Philip A. Wolf, Thomas R. Price, Daniel B. Hier Jan 1992

Thalamic Stroke: Presentation And Prognosis Of Infarcts And Hemorrhages, Wolfgang Steinke, Ralph L. Sacco, J. P. Mohr, Mary A. Foulkes, Thomas K. Tatemichi, Philip A. Wolf, Thomas R. Price, Daniel B. Hier

Chemistry Faculty Research & Creative Works

Thalamic Strokes in 62 Patients Selected from the Stroke Data Bank Were Studied to Determine Differences among 18 Infarctions (INF), 23 Localized Hemorrhages (ICH), and 21 Hematomas with Ventricular Extension (IVH). Stupor or Coma at Onset Occurred More Frequently in the IVH (62%) Than in the INF (6%) or ICH (13%) Groups and Was Reflected in Significantly Lower Median Glasgow Coma Scores in the IVH Group (7) Than in the INF (15) and ICH (14) Groups. Although Ocular Movements Were More Frequently Abnormal in the IVH Group Compared with the ICH and INF Groups, No Significant Differences Were Found in …


Early Clinical Differentiation Of Cerebral Infarction From Severe Atherosclerotic Stenosis And Cardioembolism, S. G. Timsit, R. L. Sacco, J. P. Mohr, M. A. Foulkes, T. K. Tatemichi, P. A. Wolf, T. R. Price, D. (Daniel) B. Hier Jan 1992

Early Clinical Differentiation Of Cerebral Infarction From Severe Atherosclerotic Stenosis And Cardioembolism, S. G. Timsit, R. L. Sacco, J. P. Mohr, M. A. Foulkes, T. K. Tatemichi, P. A. Wolf, T. R. Price, D. (Daniel) B. Hier

Chemistry Faculty Research & Creative Works

Background and Purpose: Hyperacute Cerebral Infarction Trials Require Early Differentiation of Infarction Subtype. Our Aim Was to Determine Clinical Factors Predictive of Infarction Subtype from Data Collected in the Early Hours of Admission. Methods: using the 1,273 Patients Enrolled in the Stroke Data Bank, Stroke Risk Factors and Demographic, Clinical, and Radiological Features Were Compared between the 246 Cardioembolic and 113 Large-Vessel Atherosclerotic Cerebral Infarcts. Results: Stroke Data Bank Definitions Ensured More Transient Ischemic Attacks in Atherosclerotic Infarcts and More Cardiac Disease in Cardioembolic Infarcts, But the Diagnosis Was Distinguished Further using a Logistic Regression Model. Fractional Arm Weakness (Shoulder …


Fundamental Aspect And Behavior Of Saturated Fluorocarbons In Glow Discharge In Absence Of Potential Source Of Hydrogen, Yu Iriyama, H. Yasuda Jan 1992

Fundamental Aspect And Behavior Of Saturated Fluorocarbons In Glow Discharge In Absence Of Potential Source Of Hydrogen, Yu Iriyama, H. Yasuda

Chemistry Faculty Research & Creative Works

The glow discharge of a series of saturated fluorocarbons, CnF2n+2 (n = 1, 2, 4, 6, and 8), was studied with glass substrates which do not contain any hydrogen. It was found that the deposition rate was a function of the F/C ratio of the starting fluorocarbons. That is, fluorocarbons with higher F/C ratio, such as CF4 and C2F6, hardly polymerized, while fluorocarbons with lower F/C ratio, such as C8F18, polymerized as well as C2F4. After plasma exposure, the surface of glass substrate was …


Empirical Procedure That Uses Molecular Structure To Predict Enantioselectivity Of Chiral Stationary Phases, Alain Berthod, San Chun Chang, Daniel W. Armstrong Jan 1992

Empirical Procedure That Uses Molecular Structure To Predict Enantioselectivity Of Chiral Stationary Phases, Alain Berthod, San Chun Chang, Daniel W. Armstrong

Chemistry Faculty Research & Creative Works

A total of 121 racemic compounds were separated In the normal-phase mode on a (S)-(1-naphthylethyl)carbamoylated β-cyclodextrin (S-NEC-β-CD) bonded phase and 74 on the R equivalent (-NEC) chiral stationary phase (CSP). All compounds are of the type that have four substituents on a stereogenlc center, rather than an "axis of chirality". It is shown that the binary solvent pair used as the mobile phase has a significant Influence on chiral recognition. However, the proportions of the components of a specific pair have little effect. From the results, the Individual contributions to chiral recognition by these CSPs were estimated for 81 different …


1-Ferrocenyl-1-Cyclopropyl Cation: The First Long-Lived Cyclopropyl Cation, G. K.Surya Prakash, Herwig Buchholz, V. Prakash Reddy, Armin De Meijere, George A. Olah Jan 1992

1-Ferrocenyl-1-Cyclopropyl Cation: The First Long-Lived Cyclopropyl Cation, G. K.Surya Prakash, Herwig Buchholz, V. Prakash Reddy, Armin De Meijere, George A. Olah

Chemistry Faculty Research & Creative Works

No abstract provided.


A Proposal For United States/Polish Collaboration On Energy And The Environment, Carole B. Szpunar Jan 1992

A Proposal For United States/Polish Collaboration On Energy And The Environment, Carole B. Szpunar

Chemistry: Faculty Publications and Other Works

Argonne National Laboratory, a U.S. Department of Energy facility that is operated by the University of Chicago and located southwest of Chicago, Illinois, has proposed a collaborative effort by the United States and Poland to conduct applied research on energy and environmental topics of common interest. Through this collaboration, evaluative studies on energy and environmental assessment issues could be developed and implemented by Argonne and one or more sister institutions in Poland, which could lead to active research, development, and demonstration joint activities. The objective of this initiative is to produce strategies and options for review by Poland's decision makers …


Study Of The Hexamethylenetetramine, Ammonia, And Formaldehyde System: Quantitative Determinations, Gary Lee Madsen Jan 1992

Study Of The Hexamethylenetetramine, Ammonia, And Formaldehyde System: Quantitative Determinations, Gary Lee Madsen

Dissertations

No abstract provided.


Structure Of (22S)-3Β-Acetoxy-20-(3-Isopropylisoxazolin-5-Yl)-4,4,14 Α-Trimethylpregn-8(9)-Ene, Sergey V. Lindeman, Mikael S. Alexanyan, Yuri T. Struchkov, Rajesh Kumar Thaper, Irina G. Reshetova, Alexey V. Kamernitzky Jan 1992

Structure Of (22S)-3Β-Acetoxy-20-(3-Isopropylisoxazolin-5-Yl)-4,4,14 Α-Trimethylpregn-8(9)-Ene, Sergey V. Lindeman, Mikael S. Alexanyan, Yuri T. Struchkov, Rajesh Kumar Thaper, Irina G. Reshetova, Alexey V. Kamernitzky

Chemistry Faculty Research and Publications

C32H51NO3, Mr = 497·7, orthorhombic, P212121, a = 7·577 (2), b = 10·510 (2), c = 35·399 (7) Å, V = 2819 (1) Å3, Z = 4, Dx = 1·173 g cm-3, λ (Mo Kα) = 0·71073 Å, μ = 0·69 cm-1, F(000) = 1096, T = 153 K, R = 0·0497 for 2235 observed reflections. The compound investigated is found to be a (22S)-epimer.


The Synthesis And Chemistry Of N-Chlorosulfenylaziridines, Michael Claude Hare Jan 1992

The Synthesis And Chemistry Of N-Chlorosulfenylaziridines, Michael Claude Hare

Dissertations and Theses

Thiazyl chloride, the monomer of trichlorotrithiazene, reacts with fluorinated olefins to form N-chlorosulfenylaziridines. Four members of this new class of compounds have been prepared. Fluorine NMR, carbon-13 NMR, mass spectrometry, infrared spectroscopy, and elemental analysis have been used to characterize these compounds.