bluuebunny/crossref_metadata_2025_split huggingface dataset:
Triterpentrïdes De Dodonaea Viscosa
Authors: Dimbi Makoso Zexa , Kapundu Mpuza , Darimont Edmond , Warin Roger , Delaude Clément , Huls Robert 
Published: September 2010

AbstractFrom the saponin of the stem barks of Dodonaea viscosa (L.) Jacq. (Sapindaceae) we have isolated the known genins R1‐barrigenol and Jegosapogenol and two novel prosapogenins R1‐barrigenol 21,22‐diangelate and Jegosapogenol 21‐(2,3‐dihydroxy‐2‐methylbutyrate),22‐angelate. Structures have been elucidated chiefly by spectroscopic means.
Étude Des Propriétés Oxydantes D'Alcènes De L'Iodylbenzène En Présence D'Acetylacétonate De Vanadyle
Authors: Barret R. , Pautet F. , Daudon M. , Fillion H. , Mathian B. 
Published: September 2010

AbstractVanadylacetylacetonate catalyses the epoxidation of olefins by iodylbenzene. A free radical oxidation mechanism is postulated.
A Configuration‐Retaining α, β‐Diol to 1,4‐Dioxane Conversion1
Authors: Hosten N. G. C. , Tavernier D. , Anteunis M. J. O. 
Published: September 2010

AbstractCis‐Perhydronaphtalene‐2,3‐diol treated with ethyl diazoacetate/rhodium (II) pivalate gives the mono‐O‐alkylation product which cyclizes readily to the lactone (dioxanone). Photo‐chemical deoxygenation with trichlorosilane affords the dioxane derivative perhydro‐1,4‐dioxaanthracene.
Helicenes: Synthèse Photochimique De Fluoro‐1‐Pentahelicenes
Authors: Gorsane M. , Martin R. H. 
Published: September 2010

Abstract1‐Fluoropentahelicene and substituted derivatives have been synthesized by the photocyclodehydrogenation of 1,2‐di(2‐naphthyl) ethylenes (1) and 3‐styrylphenanthrenes (2). In two cases (la and 2d) the photocyclisations gave rise to benzo [g,h,i] perylenes (7, 8, 23, 24) a reaction involving either the loss (8, 24) or the migration (7, 23) of the fluorine atom. The1H‐NMR spectra are described.
Polarographic Behaviour of Phenylbiguanide Hydrochloride
Authors: Martinez Calatayud J. , Fagoaga Caridad P. , Vicente Pedrós F. 
Published: September 2010

AbstractThe polarographic behaviour of phenylbiguanide hydrochloride in aqueous solution is studied. A cathodic wave is observed between 1.90 and 9.89 pH values. The electrodic process is described. The calibration graph is linear up to 10−3 M phenylbiguanide.
Polarography of n‐Butyl 3‐Mercaptopropionate In Water and its Mixtures With Methanol, Acetonitrile and Dioxane
Authors: Gupta K. C. , Jain Miss Nita 
Published: September 2010

AbstractThe polarographic behaviour of n‐butyl 3‐mercaptopropionate (R‐S‐H) at the DME in aqueous methanol, acetonitrile and 1,4‐dioxane has been investigated in presence of 0.1 M KNO3 and 0.01% thymol. The effect of pH, concentration of RSH and drop time, on the wave characteristics and the mechanism of the reaction occurring at the surface of the mercury drop have been studied. Well‐defined reversible and diffusion controlled anodic waves were obtained in aqueous (pH=3.8) 40% v/v methanol (pH=3.86) and 40% v/v acetonitrile (pH=2.94). In 40% v/v dioxane a well‐defined irreversible anodic wave was obtained at pH=8.1. Mathematical and analytical evidence was obtained to show that the anodic wave of RSH at the DME in aqueous 408 v/v methanol, 40% v/v acetonitrile and 40% v/v dioxane is due to formation of a mercury complex RSHg. The linearity of id with RSH concentration provides a rapid and precise method for the determination of RSH, down to 0.4 mM in aqueous methanol, acetonitrile and dioxane medium
Photochemical Reactivity and Fluorescence Analysis of 6‐Methoxyquinoline, 6‐Methoxyquinaldine, and 4,7‐Dichloroquinoline
Authors: Fidanza J. , Aaron J. J. 
Published: September 2010

AbstractThe photochemical reactivity of 6‐methoxyquinoline, 6‐methoxyquinaldine, and 4,7‐dichloroquinoline has been investigated by UV spectrophotometry and spectrophotofluorimetry, in liquid solution and on silica‐gel thin layers. Ultraviolet irradiation decreases the fluorescence intensity of 6‐methoxyquinoline and 6‐methoxyquinaldine, with apparent first‐order rate constants of photolysis. A highly fluorescent photoproduct is formed upon irradiation of 4,7‐dichloroquinoline, and a photochemical scheme is proposed. The effect of solvent composition, pH, and irradiation time on fluorescence intensity, and the effect of medium on the photochemical enhancement or quenching of fluorescence have been studied for the three compounds. Fluorimetric pKa values are found to be in good agreement with the ground‐state dissociation constants. Linear calibration plots are obtained over a concentration range of two to three orders of magnitude. Very low fluorimetric detection limits, at the picomole (or ng) level are determined for the methoxyquinolines. Photochemical‐fluorimetry is a useful method for the analysis of 4,7‐dichloroquinoline
Optimization of a Wet Digestion Method for the Determination of Mercury in Coal Samples by Cold Vapor Atomic Absorption Spectrometry (CVAAS)
Authors: Dumarey R. , Verbiest P. , Dama R. 
Published: September 2010

AbstractA comparative study is reported on different wet‐digestion mixtures and reaction vessels for the reduction‐aeration/amalgamation/CVAAS determination of mercury in coal samples. A 100% recovery is obtained when performing the digestion in HNO3/HCIO4/(NH4)2S2O8 at 250–300°C using the Bethge apparatus. Total reaction time is about 30 min. No interference is found by undissolved silicates which are eliminated by filtration. The digests are stable for 24 h. The detection limit is 0.2 ng Hg ml−1 for a 5ml‐fraction analysis, corresponding to 0.08 ppm in the coal. The reproducibility of the entire method is better than 2% above 0.5 ng ml−1. Results are given for the analysis of standard reference coal samples showing a good agreement with the certified value
Transition State Solvation Effects in the Kinetics of Decomposition of Tetraphenylphosphonium Bromide With Hydroxide or Methoxide Anions In Protic‐Dipolar Aprotic Solvent Systems
Authors: Khalil Fayez Y. , Abdel‐Halim F. M. , Hanna M. T. , El‐Batouti M. 
Published: September 2010

AbstractA kinetic study has been made of the decomposition of tetraphenyl‐phosphonium bromide with hydroxide or methoxide anions in mixtures of dimethyl sulphoxide with methanol. Both reactions display drastic rate increase as the DMSO content of the medium is increased. The rate of the OH− reaction is faster than that of the OMe−, due to a change in mechanism, and the kinetic factor k'OH‐/k'OMe‐depends largely on solvent composition. The transition state solvation is believed to exihibit a large contribution in rate enhancement. Solvent effects are shown to be far more important in determining the electrostatic phenomena than other solvent properties like dielectric constant. The thermodynamic parameters of the activated complex are considered.
Synthèse Et Étude Rmn 1H Et 13C Du 1‐(9‐Anthryl) Éthanol Et Des 2,2,2‐Trifluoro‐2,2,2‐Trichloro‐et 2,2,2‐Tribromo‐1‐(9‐Anthryl) Éthanols. Estimation Des Barrières Conformationnelles
Authors: Ben Hassine B. , Gorsane M. , Pecher J. , Martin R. H. , Defay N. , Ottinger R. 
Published: September 2010

AbstractThe alcohols 1 to 4 were prepared with good to excellent yields. Their 1H and 13C N.M.R. spectra were recorded at different temperatures. For 1, 2 and 3, the conformational barriers corresponding to the C(9')‐C(1) rotation are close to 11, 14.5 and 19 KcalM−1, respectively.
N‐(1‐Acyloxyalkyl) Heteroaryliumsalze, IV1 Konformationskontrollierte Deprotonierung
Authors: Anders E. , Clark T. , Stankowiak A. , Boldt H. G. , Fuchs R. 
Published: September 2010

AbstractMNDO semiempirical molecular orbital theory has been used to investigate the various possible reactions open to the title compounds (eq. 2–4).Specifically, the energy differences between the compounds resulting from deprotonation in the ortho‐, meta‐, and para‐positions of pyridine and pyridine‐N‐oxide are compared with those obtained from N‐alkylpyridinium salts.A variety of results from the literature can be explained with help of the MNDO results. The mechanism of the substitution reaction (2) is determined by the energetically favored conformation of the salts 7.
Insight in the Mechanism of Cyclopropanation of Electrophilic Olefins by 2‐Metallo‐2‐Nitro‐Propanes
Authors: Chaboteaux C. , Krief A. 
Published: September 2010

Abstract2‐metallo‐2‐nitro‐propanes proved particularly powerful reagents for the synthesis of gem‐dimethylcyclopropane carboxylic esters. Insight into the intimate mechanism of this reaction is disclosed for the first time.
Establishment of the Nature of the Reactive Species of Ni(III) ION: Kinetics of Oxidation of Iodide and Thiocyanate Ions by NiO(OH) In Aqueous H2SO4 Medium
Authors: Rayapa Reddy T. , Murthy G. S. S. , Jagannadham V. 
Published: September 2010

AbstractSolid nickel oxyhydroxide [NiO(OH)] has been prepared by oxidation of Ni(II) ions by bromine in aqueous alkali. The reaction of this nickel oxyhydroxide with iodide and thiocyanate ions in aqueous H2SO4 medium is overall second order, being first order each in [oxidant] and [reductant]. The rates of oxidation of iodide and thiocyanate ions were affected by added H+, So ions and also dependent on solvent polarity. The order in [H+] was found to be 2, suggesting that Ni(OH)2+ may be the reactive species. This was further confirmed by ionic strength and solvent effect studies. Evidence for no complex formation between Ni(OH)2+ and either iodide or thiocyanate ions led to conclude that the reaction is an outer sphere electron transfer process.
Proton NMR and Mass Spectrometric Study of Triazolobenzodiazepines
Authors: Fernandez‐Arciniega M. A. , Hernandez L. , Habeeb A. H. R. , Alonso R. M. , Jimenez R. M. 
Published: September 2010

AbstractThe proton NMR and the high‐resolution electron impact mass spectra of alprazolam and triazolam, two new triazolo [4,3‐a]‐[1,4]‐benzodiazepines were studied.
Diastereoselective NaBH4 Reductions of (dl) α‐Keto Esters
Authors: Ben Hassine B. , Gorsane M. , Pecher J. , Martin R. H. 
Published: September 2010

AbstractThe (dl) α‐keto esters 16, were prepared from the (dl) carbinols 1 to 4 and from (dl)‐2‐hydroxyheptahelicene 5. These (dl) α‐keto esters underwent NaBH4 reductions to give the corresponding diastereomeric (dl) α‐hydroxy esters 17, with 54 to ∼100% diastereomeric excesses.
Synthesis of the Racemic Form of (Z)‐1, 17‐Diaminooctadec‐9‐Ene, An Aliphatic Diamine From Coccinellidae, Determination of the Absolute Configuration of the (+)‐Naturally‐Occurring Antipode
Authors: Braconnier M. F. , Braekman J. C. , Daloze D. 
Published: September 2010

AbstractThe total synthesis of the title compound (1) has been achieved. Also reported is the use of lanthanide induced shifts in 1H NMR spectroscopy to assign the absolute configuration of the α‐carbon atom in chiral primary α‐methylalkylamines. Application of this empirical method to natural (+)‐1 shows that it has the R‐configuration at C‐17.
Separation of Cadmium(II), Iron(III), Nickel(II) and Copper(II) in Aqueous Solutions Using Adogen‐Foam Columns
Authors: Farag A. B. , El‐Wakil A. M. , El‐Shahawi M. S. 
Published: September 2010

AbstractPolyurethane foam, polyether of open‐cell type, immobilizing Adogen‐364 (trialkyl tertiary amine) has been prepared and its capability for the separation of some metal ions in aqueous solution was examined. Adogen‐loaded foam columns have successfully been used in the separation of cadmium(II), iron(III), nickel(II) and copper(II). Typical examples of separations are given.
Organocobalt Compounds in the Synthesis of Pyridines
Authors: Bönnemann H. , Brijoux W. 
Published: September 2010

AbstractThe cocyclization of alkynes with cyano compounds using organocobalt catalysts of the type [YCoL] is a useful synthetic method for pyridine and its derivatives. Y represents a controlling ligand, e.g. cyclopentadienyl, L is a neutral ligand, e.g. cyclooctadiene. A correlation between the 59Co NMR spectra of the [YCoL]‐complexes and their catalytic properties in the pyridine synthesis leads to certain structure‐effectivity relationships.
Catalytic Oxidations in Organic Synthesis
Authors: Sheldon Roger 
Published: September 2010

AbstractDespite the availability of attractive catalytic alternatives the average synthetic organic chemist still clings to the use of expensive, environmentally unacceptable stoichiometric oxidants when confronted with an oxidative transformation. The scope and versatility of alternative catalytic oxygen transfer reagents, which employ a metal catalyst in conjunction with a cheap, readily available oxygen donor, such as hydrogen peroxide, an alkyl hydroperoxide or hypochlorite, are reviewed. These reagents are environmentally more acceptable than their stoichiometric counterparts and eminently suitable for industrial applications.In choosing examples to illustrate the general theme emphasis has been placed on reactions often encountered in organic synthesis, e.g. alcohol oxidations, and those exhibiting unusual chemo‐, regio‐ and stereoselectivities. Both synthetic and mechanistic aspects are discussed. The mechanisms and potential synthetic utility of biomimetic oxygen transfer processes are also reviewed.
The Synthesis of Organic Chemicals by Catalytic Reactions of Carbon Dioxide
Authors: Behr Arno 
Published: September 2010

AbstractDifferent reactions are discussed in which carbon dioxide adds to unsaturated hydrocarbons after activation by transition metal catalysts. Alkynes react in the presence of nickel or rhodium complexes to yield substituted pyrones. Alkenes are also described to react with CO2 yielding acids and esters; however, the proof, that carbon dioxide is really involved in this reaction, is still lacking. The best studied reaction is the chemistry of carbon dioxide and butadiene. Using palladium, nickel and ruthenium catalysts γ‐ and Δ‐lactones are formed by the reaction of two molecules of butadiene and one molecule of CO2. The catalyst and the reaction parameters could be optimized thus enabling the synthesis of the Δ‐lactone in an industrial scale. A mechanism is proposed in which a carboxylate complex is discussed to be the key intermediate, and a similar palladium complex could be. isolated in a related stoichiometric experiment. Using rhodium catalysts, a γ‐lactons is formed in which three molecules of butadiene are connected to one molecule of carbon dioxide. Also the co‐reaction of butadiene, isoprene and CO2 yields novel lactones. All these products may become of interest as fine chemicals, for instance fragrances. Another possible use of the lactones is their conversion into open‐chained products. The splitting of the Δ‐lactone yields new carboxylic acids and esters with hydroxy or methoxy substituents, which may become useful starting molecules for chemical syntheses.
Médiation Électronique Et Effet De Température Dans Le Cycle Photocatalytique Du Tris(2,2'‐Bipyridine)Rhodium(III)
Authors: Hubesch Bruno , Mahieu Bernard , Meunier‐Piret Jacqueline 
Published: September 2010

AbstractMethylviologen or iodate were efficiently used as electronic relays in the Rh(bipy)/dextrose/TiO2‐Pt(o)/buffer(pH=1.30) photocatalytic system. The temperature shows little effect on the photoevolution of hydrogen. The crystallographic structure of Rh(bipy) has been investigated.
The Solid State Conformation of Trans N‐Pivaloyl‐D‐Phenylalanyl‐L‐Proline‐N‐Ethylamide C21H31H31N3O3
Authors: Wu S. , Tinant B. , Declercq J. P. , van Meerssche M. , Borremans F. A. M. , Anteunis M. J. O. 
Published: September 2010

AbstractThe X‐ray structure of N‐Piv‐D‐Phe‐L‐Pro‐NHEt(C21H31N3O3) was solved by direct methods from diffractometer data. Crystallized from diethylether solution, orthorhombic, space group P212121, a = 19.336(24) b = 16.818(18), c = 6.488(7)Å, V = 2110(4)Å3, Dx = 1.18 g cm−3 for Z = 4. MoKα radiation, λ = 0.71069 Å; μ = 0.85 cm−1, F(000) = 808. Final R value = 0.084 for 1307 observed reflections.The peptide backbone is in the all‐transoid configuration and takes the type II β bend conformation characterized by ϕ1,Ψ1,ϕ2 and Ψ2 values of 61.8°, ‐123.2°, ‐84.8° and 0.8° respectively and by an intramolecular hydrogen bond involving the ethylamide NH and the pivaloyl carboxyl oxygen. The phenyl group stacks over the central amide bond in the “extended‐to‐oxygen” rotamer, thereby facing the prolyl side chain.
The Structure of the Trans N‐Pivaloyl‐D‐Phenylalanyl‐L‐Thiazolidine‐4‐(N′‐Ethyl)Carboxamide in the Crystalline State C20H20N3O3S
Authors: Wu S. , Tinant B. , Declercq J. P. , van Meerssche M. , Borremans F. A. M. , Anteunis M. J. O. 
Published: September 2010

AbstractThe X‐ray structure of N‐Piv‐D‐Phe‐L‐Thz‐NHEt(C20H20N3O3S) was solved by direct methods from diffractometer data. Crystallized from diethylether solution, orthorhombic, space group P212121, a = 19.466(10), b = 16.768(13), c = 6.384(3)Å, Dx = 1.25 g cm−3 for Z = 4, V = 2084(2)Å3, MoKα radiation, λ = 0.71069 Å; μ = 1.81 cm−1, F(000) = 840. Final R value = 0.051 for 1233 observed reflections.The peptide chain forms a bend of the type II' β (ϕ1,Ψ1,Ψ2,Ψ2 = 62.5°, ‐125.1°, ‐92.5° and 10.1°), with the three amide bonds in the trans configuration. This conformation is stabilized by an intramolecular hydrogen bond between the NH ethyl group and the oxygen of the pivaloyl moiety.
Utilisation du Tri‐n‐Butylaluminium Pour la Transformation du Dibenzyldichloroétain en Dibutyldichloroétain
Authors: Mahieu B. , Mestdagh‐Peeters C. , De Laet M. 
Published: September 2010

AbstractBenzyl chloride easily reacts with tin metal to yield dibenzyltin dichloride; no catalyst nor drastic conditions are needed to achieve the reaction. Such a singularity has lead to propose benzyl chloride as a reagent for tin recovery (from tinplates e.g.).However, benzyltin derivatives show poor performances as compared to butyltin compounds, especially from the point of view of phytopharmacy and PVC protection. Metathesis of the benzyl groups with butyl groups by means of tri‐n‐butylaluminium increases the economic interest of the recovery process.
Reaction Pathways in 1‐Butanol Dehydration on γ‐Alumina
Authors: Berteau P. , Ruwet M. , Delmon B. 
Published: September 2010

Abstract1‐Butanol dehydration has been studied on pure γ‐Al2O3. Dehydration products are 1‐butene, dibutylether and water, and an isomerization reaction leads to 2‐butene.The aim of this work was to obtain basic information on the influences of experimental parameters like reaction temperature, reactant partial pressure and contact time on the activity of our catalyst.We propose a reaction pathway where the most important fact is a competitive phenomenon between direct and consecutive dehydration reactions.
New Aminoquinolones from Arylisocyanates and Ynediamine
Authors: Bouvy A. , Janousek Z. , Viehe H. G. , Arietta J. M. 
Published: September 2010

AbstractYnediamine 1 is a versatile synthon in heterocyclic chemistry. It reacts with arylisocyanates to furnish new diaminoquinolones 4 and 5 by rearrangement as confirmed by X‐Ray measurements. They react with phosgene by loss of methyl chloride whereby an oxazolone ring is formed.
The Outline Structure of Protein Domains Called Kringles
Authors: Esnouf P. , Lawrence M. P. , Mabbutt B. C. , Patthy L. , Pluck N. , Williams R. J. P. 
Published: September 2010

AbstractIn this paper we show how nuclear magnetic resonance (NMR) methods can be used to analyse the structure and mobility of the domains, kringles, of the proteins of the blood clotting system, prothrombin and plasminogen. The methods are quite general to similar domains in many proteins.
Viscosity Dependency of Intramolecular Excimer Formation in Modelsystems for Poly (N‐Vinylcarbazole)
Authors: Vandendriessche J. , van Der Auwerser M. , De Schryvar F. C. 
Published: September 2010

AbstractThe viscosity dependency of the rate constant of intramolecular excimer formation in 1,3‐di (N‐carbazolyl)‐propane and meso‐2,4‐di(N‐carbazolyl) pentane in a series of alkane solvents is reported. The results are fitted to the models of Gegiou, Kramers, and Skinner and Wolynes. The models of Kramers, and of Skinner and Wolynes fail to describe the experimental data of 1,3‐di(N‐carbazolyl)‐propane, the model of Gegiou, which is based on the free volume required for rotation processes, describes accurately these data. The data of meso‐2,4‐di(N‐carbazolyl)pentane, in the measured viscosity domain, are nearly equally adequate described by the three models.
Stereochemical Outcome of the Reaction of Some α‐Selenoalkyllithiums with 4‐t‐Butyl Cyclohexanone
Authors: Labar D. , Krief A. , Norberg B. , Evrard G. , Durant F. 
Published: September 2010

Abstractα‐selenoathyllithiums were found to have a high propensity to add to 4‐t‐butyl cyclohexanone in an equatorial mode. Stereochemical assignments are discussed.
Pyridines. XIV1 ‐Acylation de Pyridyl‐Lithioènamidines. Synthèse de Pyridyl‐N‐Acylènamidines et de Pyridylpyrimidones‐4
Authors: Compagnon Paul‐Louis , Gasquez Françoise , Kimny Tan 
Published: September 2010

AbstractThe mixture PhLi:di‐ or tri‐methylpyridine 1:PhCN:RCOCl (R=Me, Ph, Et0, Me2N) or PhCO2Me (molar ratio 3:1:3:3) leads through the intermediates primary lithioenamines 3 and lithioenamidines 4, to acylated products, N‐acylenamines (enamides) 5, β‐diketones and β‐ketoesters 6, C‐acylenamides 7, N‐acylenamidines 8 and their cyclization derivatives, pyridylhydroxypyrimidines 10 (yield up to 60%) and pyridyldihydropyrimidones 11 (yield up to 10%). Distillation of the crude extract leads to naphthyridones 12 (yield up to 10%) which result from thermocyclization of the enamides 5f, 5g and 7f. Various by‐products are isolated such as N, N‐dimethyl‐N', N'‐diphenylmethyleneurea resulting from N‐lithiodiphenylketimine and phenacylpyridines 13. Crotonization and oxidation of the latter compounds lead to the aza‐analogues 14, 15 of dibenzoylstilbenes.
Dehydration, Deammoniation and Thermal Stability of Ferrierite
Authors: Verbiest J. , Vansant E. F. 
Published: September 2010

AbstractAn attempt was made to clarify the adsorption mechanism of partially hydrated and ammoniated ferrierite. The adsorption of CO, CO2, N2, O2, Xe, Kr, Ar, CH4 on the H‐ferrierite was investigated as a function of the adsorption temperature. Using equilibrium thermal analyses and adsorption techniques (N2 at 77 K) the dehydration and deammoniation of ferrierite has been studied. Important adsorption variations depending on the pretreatment temperature were observed. The thermal stability of ferrierite was investigated using the adsorption values for N2 at 77 K of pretreated samples. A dehydroxylation and a sintering of the zeolite convert the zeolite into a ‘glass‐like’ species at 1173 K, unsuitable for adsorption. The adsorption behaviour of H‐ferrierite and H‐mordenite LP show only a qualitative analogy; no quantitative relations were observed.
The Uv‐Vis Spectra of the M(LH2)2X2 Complexes with Planar Dithiooxamides. M=Ni,Pd,Pt; X=Cl,Br,I
Authors: Hofmans H. , Desseyn H. O. 
Published: September 2010

AbstractThe electronic spectra of the M(LH2)2X2 complexes with planar dithiooxamides have been recorded in KX matrices. The relative positions of the absorption bands and the characteristic shifts on metal and ligand substitution are used to assign the electronic transitions.
Crystal Structure of 4‐Tert‐Butylimino‐3, 3‐Diethoxycarbonyl‐1‐Methyl‐2‐Tosylimino‐Azetidine
Authors: Meervelt Luc Van , L'Abbé Gerrit , King Geoffrey S. D. 
Published: September 2010

AbstractThe crystal structure of 4‐tert‐butylimino‐3, 3‐diethoxycarbonyl‐1‐methyl‐2‐tosylimino‐azetidine (C21H29N3O6S, a=25.334(4), b=8.223(1), c=11.574(2) Å, β=91.88(1)°, space group P21/n, Z=4) has been determined by single‐crystal X‐Ray diffraction techniques and refined to R=0.095 (The high R‐value is ascribed to the small crystal size and also to partial disorder in a side‐chain). The four membered ring is planar with a long C‐C bond of 1.60(2) Å. The bond lengths of the exocyclic imino functions differ significantly.