bluuebunny/crossref_metadata_2025_split huggingface dataset:
Chemistry of acetylenic ethers 93. Photochemical additions of acetylenes (I) reactions of ketones with 1‐methylthio‐1‐propyne
Authors: Bos H. J. T. , Boleij J. 
Published: September 2010

AbstractPhotoaddition of aromatic ketones to 1‐methylthio‐1‐propyne affords, via C3O‐cycloaddition, 4,4‐diaryl‐3‐methylthio‐3‐buten‐2‐ones in good yields. Analogously acetone gives 4‐methyl‐3‐methylthio‐3‐penten‐2‐one (CH3)2CC(SCH3)COCH3, together with some 1,2‐bis(methylthio)‐1‐propene CH3C(SCH3)CH‐SCH3.
Solvolysis of endo‐bicyclo[3.2.1]octa‐2,6‐dien‐8‐yl derivatives
Authors: Klumpp G. W. , Ellen G. , Bickelhaupt F. 
Published: September 2010

AbstractThe hydrolysis of endo‐bicyclo[3.2.1]octa‐2,6‐dien‐8‐yl chloride and the acetolysis of endo‐bicyclo[3.2.1]octa‐2,6‐dien‐8‐yl tosylate have been investigated. The importance of anchimeric assistance in these solvolyses has been estimated and compared with other homoallylic systems.
Synthesis of the α,α′‐dehydrodimer of methyl octanoate and the β,β′‐dehydrodimer of methyl nonanoate and their mass and NMR‐spectra
Authors: Voet W. J. E. , Zeilstra E. M. 
Published: September 2010

AbstractDimethyl 7,8‐tetradecanedicarboxylate and 7,8‐di(methoxycarbonylmethyl)‐tetradecane have been synthesized. 2‐Bromooctanoic acid ester was coupled to ethyl cyanoacetate and the reaction product converted with hexyl iodide. Saponification, decarboxylation with copper and acid hydrolysis yielded the octanoic acid dehydrodimer. 7,8‐Di(hydroxymethyl)tetradecane was converted with tosyl chloride and the product treated with KCN to give a dicyanide.The purity of the compounds was checked with GLC. Their mass spectra showed different characteristic fragmentation patterns. In the NMR spectra δ‐shift values were different.
Synthesis and some properties of 1‐alkenyl alkyl disulfides and di(1‐alkenyl) disulfides
Authors: Wijers H. E. , Boelens H. , van der Gen A. , Brandsma L. 
Published: September 2010

AbstractThe synthesis of 1‐alkenyl alkyl disulfides, R‐CH=CH‐S‐S‐R′, and di(l‐alkenyl) disulfides, R‐CH=CH‐S‐S‐CH=CH‐R, with R = H or alkyl and R′ = alkyl, is reported. Reaction of 1‐alkenethiolates R‐CH=CH‐SLi(Na), prepared in situ by cleavage of 1‐alkenyl alkyl sulfides with alkali metal in liquid ammonia, with S‐alkyl alkanethiosulfonates, R′‐S‐SO2‐R′ or alkyl thiocyanates, R′‐SCN, affords 1‐alkenyl alkyl disulfides in excellent yields. Reaction of alkenylmagnesium halides, R‐CH=CH‐SMgCl(Br), likewise leads to formation of 1‐alkenyl alkyl disulfides, but yields are moderate. Treatment of l‐ethylthio‐2‐propenylthioethene, CH3‐CH=CH‐S‐CH=CH‐S‐C2H5, with podium amide in liquid ammonia, results in formation of sodium 1‐propenethiolate which reacts with S‐propyl propanethiosulfonate to give propenyl propyl disulfide in good yield. Oxidation in situ of 1‐alkenethiolate anions with iodine affords the corresponding di‐(l‐alkenyl) disulfides.
Peptide derivatives related to the active site of some hydrolytic enzymes: IV. Tetrapeptide derivatives containing D‐serine
Authors: Kienhuis H. , van der Holst J. P. J. , Verweij A. 
Published: September 2010

AbstractThe syntheses of derivatives of the L‐L tetrapeptides Gly‐Asp‐Ser‐Gly and Gly‐Glu‐Ser‐Gly have been described in preceding communications H. Kienhuis, A. van de Linde, J. P. J. van der Holst and A. Verweij, Rec. Trav. Chim. 80, 1278 (1961).
A. van de Linde, H. Kienhuis, A. Verweij and J. P. J. van der Holst, ibid. 80,1305 (1961).
H. Kienhuis, J. P. J. van der Holst and A. Verweij, ibid. 83, 1129 (1964).
. These compounds were used as models for esterases. In order to study the effects of configuration and conformation in our model reactions, we synthesised the diastereoisomeric peptide derivatives containing D‐serine instead of L‐serine. In Fig. 1 the difference of the relative positions of the side chains of aspartic acid and serine is demonstrated for the stretched forms of the L‐L and L‐D peptides.
Nitromethane as a ligand. Part II: Complexes with some divalent metals and the tetrachloroferrate (III) anion
Authors: Driessen W. L. , Groeneveld W. L. 
Published: September 2010

AbstractFive new complexes are reported with nitromethane as a ligand, viz. [M(CH3NO2)6]2+[FeCl4]2− where M is Mg(II), Mn(II), Fe(II), Co(II) and Ni(II). They are identified by chemical analysis and with the aid of physical measurements.The NO2 rocking mode (BI) shifts to higher frequencies; no shift in the NO stretching frequencies has been observed.In the far infrared a metal‐dependent absorption band is observed, which is attributed to the metal‐ligand stretching vibration.It is noticed that the relative size and stability of the anion influences such quantities as formation of the complex in the first place, shifts in ligand vibrational frequencies, ligand field transitions.
The oxidation of dithiocarbamato complexes of nickel, copper and zinc
Authors: Brinkhoff H.C. , Cras J.A. , Steggerda J.J. , Willemse J. 
Published: September 2010

AbstractOxidation of N,N‐di‐n‐butyldithiocarbamato (bu2dtc) complexes of Cu(I), Ni(II), Zn(II), Cd(II) and Hg(II) is reported. Oxidation of Ni(bu2dtc)2 with Cl2, Br2, or of NiX2 (X = Cl, Br, NO3) with N,N,N′,N′‐tetra‐n‐butylthiuram disulfide (bu4tds) gives complexes of composition [Ni(bu2dtc)3]X. These compounds are diamagnetic and dissolve in nitrobenzene as 1:1 electrolytes, their UV spectra resemble that of the iso‐electronic Co(bu2dtc)3. The experimental data are in accord with the assumption that in these compounds Ni(IV) flow spin d6) is surrounded by 6 S atoms in octahedral symmetry. The analogous selenium compound tris (N, N‐di‐n‐butyldiselenocarbamato) nickel(IV) bromide, having the same properties as the thio compounds, can also be prepared. Oxidation of Cu(bu2dtc) with Cl2 or Br2 yields paramagnetic products with the composition CuX3(bu2dtc), in which Cu also has the formal oxidation number + 4, but the structure of these compounds is still obscure. Oxidation of Zn(bu2dtc)2 and the corresponding Cd and Hg compounds yields products, the analysis of which suggests the composition MX2(bu2dtc)2 (M = Zn, Cd or Hg, X = Br or I), but infrared studies indicate that the dithiocarbamato ligands of the starting substances are oxidized to bu4tds, which in the reaction products is coordinated to the metal in its normal oxidation state + 2.
The vibrational spectra and structures of the compounds KNO2S2O7 and NOHS2O7
Authors: Gerding H. , Gijben H. , Stufkens D.J. 
Published: September 2010

AbstractThe infrared absorption and Raman spectra of the compounds KNO2S2O7 and NOHS2O7 have been studied. It follows from these spectra that both compounds are ionic and should be written as K+NO2+S2O7− and NO+HS2O7−, respectively.
Isomerization of cyclic olefins in basic media. Part 3: The double bond migration of [l‐14C]‐cyclohexene.
Authors: Tjan S.B. , Steinberg H. , de Boer Th. J. 
Published: September 2010

AbstractThe double bond migration of [l‐14C]‐cyclohexene under the influence of potassium tert‐butoxide in dimethyl sulfoxide has been studied at three temperatures. The activation parameters are ΔH‡ = 19.5 ± 0.4 kcal/mole and ΔS‡ = −24.6 ±0.6 e.u.The reaction is first order in olefin and 3/2 order in base up to about 0.3 molar. It is postulated that in dimethyl sulfoxide a small amount of base is present as a catalytically ineffective trimer, which dissociates into various active basic species, thus explaining the 3/2 order. At concentrations above 0.3 molar the kinetic order decreases, presumably because of ineffective solvation of charged species by lack of solvent molecules.
Ring transformations in reactions of heterocyclic compounds with nucleophiles. Part. XVI: A tracer study of the formation of 4(5)‐ethynyl‐2‐phenylimidazole from 4‐chloro‐5‐methyl‐2‐phenylpyrimidine by potassium amide in liquid ammonia
Authors: van Meeteren H.W. , van der Plas H.C. , de Bie D.A. 
Published: September 2010

AbstractTreatment of 4‐chloro‐5‐methyl‐2‐phenyl‐[4‐14C]pyrimidine with potassium amide in liquid ammonia yields a 4(5)‐ethynyl‐2‐phenylimidazole, in which the ethynyl group is attached to the radioactive carbon atom. This result indicates that during ring contraction the bond between C5 and C6 of the pyrimidine ring is broken.
Mössbauer effect of octahedral iron(II) solvates
Authors: Reedijk J. , van Der Kraan A. M. 
Published: September 2010

AbstractMössbauer measurements for some compounds of the formula Fe(ligand)6(ClO4)2 are reported. The values for the chemical shift and the quadrupole splitting are compared with literature data. For several ligands the chemical shift is compared with the spectrochemical parameters Dq and β. No simple relationship between the chemical shift and either Dq, or β, or Dq/β could be observed.
Heterogeneous and homogeneous hydrogenation of hexamethyl‐Dewar‐benzene
Authors: van Bekkum H. , van Rantwijk F. , van Minnen‐Pathuis G. , Remijnse J. D. , van Veen A. 
Published: September 2010

AbstractThe heterogeneous hydrogenation of hexamethyl‐Dewar‐benzene (1) over various transition metal catalysts has been studied. At 25° selective (> 95%) cis,exo addition of hydrogen was observed yielding 1,2,3,4,5 endo, 6 endo‐hexamethylbicyclo[2.2.0]hex‐2‐ene (2). Hydrogenation at 50°, of 2 and of 1,2,3,4,5 endo, 6 exo‐hexamethylbicyclo[2.2.0]hex‐2‐ene (3) was found to be less stereospecific; the extent of trans addition increased in the order Ru < Rh < Pd < Pt.Homogeneous hydrogenation of 1 has been accomplished using platinum‐tin complexes; a 3 : 1 mixture of 3 and 2 was formed. The mechanism of this homogeneous hydrogenation is discussed on the basis of deuteration experiments.The three 1,2,3,4,5,6‐hexamethylbicyclo[2.2.0]hex‐2‐enes and five 1,2,3,‐4,5,6‐hexamethylbicyclo[2.2.0]hexanes have been isolated. Configurations have been determined by means of NMR spectroscopy.The thermal isomerization of 1,2 endo, 3 endo, 4, 5 endo, 6 endo‐hexamethylbicyclo[2.2.0]hexane into 1,2 exo, 3 exo, 4, 5 exo, 6 exo‐hexamethylbicyclo[2.2.0]‐hexane is described.
Alkenesulfonic acids: PMR spectra and rates of base‐ and acid‐catalysed double‐bond isomerization and hydrogen‐deuterium exchange reactions
Authors: Brouwer D. M. , van Doorn J. A. 
Published: September 2010

AbstractProton magnetic resonance spectra of a number of simple alkenesulfonic acids and related hydroxyalkanesulfonic acids have been measured. The compound described in the literature as 2‐methylpropene‐1,3‐disulfonic acid (I) has been found to be 2‐methylenepropane‐1,3‐disulfonic acid (II). Interconversion of I and II and of the 1‐ and 2‐propene‐1‐sulfonic acids can be effected at 100° in 1N‐sodium hydroxide as well as concentrated sulfuric acid. The equilibration of 2‐propene‐1‐sulfonic acid and the hydrogen sulfate of 2‐propanol‐1‐sulfonic acid in sulfuric acid is much faster than the equilibration of these two compounds with 1‐propene‐1‐sulfonic acid and is thought to involve intramolecular catalysis. Double‐bond isomerization of 2‐methyl‐2‐propene‐1‐sulfonic acid can only be effected under alkaline conditions since this compound reacts rapidly with sulfuric acid to give eventually the disulfonic acids.Equilibrium constants for isomeric α,β‐ and β,γ‐unsaturated sulfonic acids are reported. The base‐catalysed isomerizations are much slower than the hydrogen‐deuterium exchange of the α‐hydrogens; the rate of acid‐catalysed exchange of both types of hydrogens in II is about the same as that of the double‐bond migration.
The heptatrienyl anion and its electrocyclization to the cycloheptadienyl anion
Authors: Kloosterziel H. , van Drunen J. A. A. 
Published: September 2010

AbstractNMR spectroscopy reveals that the reaction between hepta‐1,3,5‐triene and potassium amide yields the all‐trans heptatrienyl anion, which readily isomerizes to the cycloheptadienyl anion.
A note on the selective t‐butylation of benzene and alkylbenzenes
Authors: Baas J. M. A. , van Bekkum H. , Hoefnagel M. A. , Wepster B. M. 
Published: September 2010

AbstractBy alkylation of benzene with t‐butyl chloride in the presence of aluminium chloride, 1,4‐di‐ and 1,3,5‐tri‐t‐butylbenzene can be prepared in a simple manner. Several polyalkylbenzenes with one or more t‐butyl groups have been made readily accessible.
The ligand properties of hydroxypyridines: Part I. Hexakis(2‐pyridone) metal perchlorates and tetrafluoroborates
Authors: Reedijk J. 
Published: September 2010

AbstractA number of solvates with the general formula M(PYDO)6(anion)2, is reported; in this formula M = Mg, Mn, Fe, Co, Ni, Cu, Zn, and Cd; PYDO = 2‐pyridone, the anion ClO4− or BF4−. Further Ca(PYDO)8(ClO4)2 and Al(PYDO)6(ClO4)3 are described.The compounds are characterized by chemical analyses and a number of physical measurements. The ligand PYDO appears to coordinate to metal ions via the lone pair of electrons of the C  O link, with the ligand in the lactam form.Metal‐ligand stretching frequencies are observed in the 250‐400 cm−1 region. The ligand PYDO is placed in the spectrochemical and nephelauxetic series from ligand‐field spectra. These spectra also indicated the presence of octahedral ions M(PYDO)62+ in the solvates. Only the copper compounds are not octahedrally coordinated, as concluded from infrared spectra, X‐ray powder diagrams and paramagnetic resonance measurements. The magnetic moments of the transition‐metal compounds are also in the range for octahedrally surrounded metal ions.
Electron diffraction by gases: The molecular structures of cis‐ and trans‐4‐tert‐butyl‐1‐chlorocyclohexane
Authors: Dallinga G. , Toneman L. H. 
Published: September 2010

AbstractThe structures of cis‐ and trans‐4‐tert‐butyl‐1‐chlorocyclohexane have been determined by means of electron diffraction of the vapour. The differences in length between carbon‐carbon bonds and between axial and equatorial carbon‐chlorine bonds are compared with the results of extended Hückel MO calculations.
Conformation of non‐aromatic ring compounds: Part 55. Dipole moments, NMR spectra and conformation of trans‐2,3‐dihalogenotetralins
Authors: Buys H. R. , Leeuwestein C. H. , Havinga E. 
Published: September 2010

AbstractThe conformational equilibria in trans‐2,3‐dihalogenotetralins are studied with the aid of dipole moments and NMR spectroscopy. It is concluded that the diaxial conformer strongly predominates in solution. From the combination of dipole moment and NMR data the thermodynamic quantities ΔH0 and ΔS0 are calculated for the dichloro compound. A comparison is made with the results obtained earlier for other vicinal dihalogeno compounds.
Microbiological transformation of 9β,10α‐steroids: Part IV. 9β‐hydroxylation by curvularia species
Authors: van der Slide D. , de Flines J. , van der Waard W. F. , Smit A. 
Published: September 2010

AbstractFermentation of 9β,10α‐androst‐4‐ene‐3,17‐dione, 9β,10α‐testosterone, 9β,10α‐progesterone and 21‐hydroxy‐9β,10α‐progesterone with Curvularia species gave rise to the 9β‐hydroxylated derivatives, together with some other products.
Electrochemical reduction of aza aromatics. Part III: Reaction rate constants of the mononegative ions of the di‐aza aromatics with water
Authors: van der Meer D. 
Published: September 2010

AbstractThe protonation rate constants of the mononegative ions of the di‐aza aromatics with water are obtained from the increase in the diffusion current of the first reduction wave on addition of water to the dimethylformamide (DMF) solution. The rate constant is obtained from an approximate derivation given by Hoijtink et al. and from an exact solution given by Nicholson et al. From the dependence of the half‐wave potential on the water concentration, it is shown that the difference between the solvation of the neutral molecules and the mononegative ions is highest for the smallest molecules. Quantumchemical calculations predict a high protonation rate constant for pyrimidine and quinazoline.
Some substitution reactions of thieno[3,4‐b]thiophene and methyl thieno[3;4‐b]thiophene‐2‐carboxylate
Authors: Wynberg Hans , Feijen J. 
Published: September 2010

AbstractThe formylation of thieno[3,4‐b]thiophene gives a mixture of 4‐formyl‐ and 6‐formyl‐thieno[3,4‐b]thiophene in a ratio of 70 : 30. Lithiation followed by formylation of the resulting organolithium compounds changes this ratio to 20 : 80. The formylation of methyl thieno[3,4‐b]thiophene‐2‐carboxylate has been shown to give the 4‐ and 6‐substituted isomers in a 50 : 50 ratio. The structures of the substitution products were established by oxidation and desulfurization experiments and by PMR spectroscopy.
Association constants of molecular complexes of aromatic hydrocarbons with aldehydes, ketones and some nitro‐aromatics
Authors: Foster R. , Twiselton D. R. 
Published: September 2010

AbstractAssociation constants for complex formation between aromatic hydrocarbons and aldehydes and ketones in carbon tetrachloride solutions have been estimated from NMR proton chemical shifts. With acetone and other aliphatic ketones, there is indication of a weak interaction. In the case of some substituted benzaldehydes, the values of association constant obtained are dependent on the particular proton measured. A similar effect is observed in the complexes of 2,4,6‐trinitroanisole and of 2,4,6‐trinitrotoluene. The anomalous behaviour can possibly be accounted for if a 2: 1 complex as well as 1: 1 complex is present. Alternatively the results could be explained by a 1: 1 complex (or series of 1: 1 complexes) in which the overall chemical shift of the measured nucleus in the pure complex (or complexes) is concentration dependent.
The crystal and molecular structure of pethidine hydrobromide
Authors: van Koningsveld H. 
Published: September 2010

AbstractThe crystal structure of pethidine hydrobromide was determined by X‐ray analysis, using the heavy atom technique.The crystals are monoclinic, space group P21/c with four molecules of C15H22BrNO2 in the unit cell.Contrary to Beckett's suggestion, the aromatic ring in the molecule is linked equatorially to the piperidine ring and is nearly coplanar with the C(3)‐C(2) bond. The distance between the methyl carbon atom, attached to the piperidine nitrogen and the most distant atom of the aromatic ring, C(6)‐C(4′), is 9.61 Å, whereas the corresponding distance in the morphine molecule is 6.75 Å.
Cyanate decomposition catalyzed by certain bivalent anions
Authors: Vogels G. D. , Uffink Lida , van der Drift C. 
Published: September 2010

AbstractAmmonia production from cyanate was measured as a function of pH.The kinetic description of the process included acid‐catalyzed hydrolysis of isocyanic acid and spontaneous hydrolysis of isocyanic acid and cyanate. These reactions were predominant at pH values below 2, between 3 and 8, and above 9, respectively.The hydrolysis was strongly catalyzed by certain bivalent anions. The geometry of the anion appeared to be an important factor in the catalytic process, since carbonate, phosphate, succinate, maleate, citrate and phthalate were catalysts, whereas other bivalent anions, viz. sulfate, oxalate, fumarate and isophthalate, were without effect. Catalysis by bivalent anions was supposed to proceed via carbamoyl derivatives of the anions. The negatively charged group of the carbamoyl derivative was thought to cause an intramolecular general base‐catalyzed reaction.The implications of this study for the mechanism of urease action were considered.
On the dependence of viscosity on temperature for liquids: A semi‐empirical treatise
Authors: Fieggen W. 
Published: September 2010

AbstractIn this communication we introduce the viscosity‐temperature relation for liquids

which actually contains four independent constants. The equation is applied to literature data for water, ethanol, n‐butyric acid, aluminium isopropoxide, n‐octane, n‐eicosane, toluene and n‐decylbenzene. The mean error between observed and calculated viscosity values for the entire liquid range varies from 0.06% for n‐octane to 0.8% for toluene.The equation is derived in an approximate way from the rate‐theory approach of Eyring, in which the liquids are assumed to have a quasi‐crystalline structure. We take into account a thermal expansion of the lattice, which influences the activation energy for viscous flow. The calculated values of the parameters are consistent with their physical meaning, with a possible exception for aluminium isopropoxide. The restrictions imposed by the theoretical model are discussed.
Iso‐anellated thienopyrroles: The chemistry of 5,6‐dihydro‐4H‐thieno[2,3‐c]pyrroles and 5H‐thieno[2,3‐c]pyrroles
Authors: Feijen J. , Wynberg Hans 
Published: September 2010

AbstractThe ring closure reaction of methyl 2,3‐bis(chloromethyl)thiophene‐5‐carboxylate with several primary amines gives a series of 5,6‐dihydro‐4H‐thieno‐[2,3‐c]pyrroles. Oxidation of some of these dihydro compounds, using aqueous hydrogen peroxide in methanol, furnishes the corresponding N‐oxides. When the nitrogen atom possesses an aromatic substituent and the oxidation is carried out with aqueous hydrogen peroxide in formic acid, Meisenheimer
1 rearrangement products instead of N‐oxides are formed. The structure of one of the Meisenheimer products was elucidated by an independent synthesis of its degradation product.5H‐Thieno[2,3‐c]pyrroles are prepared by three separate methods: (a) dehydration of the N‐oxides; (b) autoxidation of the dihydrothieno[2,3‐c]‐pyrroles; (c) dehydrogenation of the dihydro compounds with chloranil.
Proton magnetic resonance studies of specifically deuterated cyclohexane compounds. Part I.: Cyclohexane and Methylcyclohexane
Authors: Remijnse J. D. , van Bekkum H. , Wepster B. M. 
Published: September 2010

AbstractThe preparation of a specifically deuterated cyclohexane and some methyl‐cyclohexanes by selective cis‐addition of hydrogen to perdeuterated cyclohexene and 1‐, 3‐, and 4‐methylcyclohexene is reported. The deuterium decoupled proton magnetic resonance spectra of these compounds are analyzed. The magnitude of the deuterium isotope effect is determined. The coupling constants show that no ring distortion is caused by the equatorial methyl group. There is an anomalous shift to higher field of the axial ring protons vicinal to the equatorial methyl group. This explains the absorptions at exceptionally high field observed for some di‐ and tri‐methylcyclohexanes.
Chemistry of Sulfines. Part VIII: Synthesis and reactions of chlorosulfines
Authors: Zwanenburg B. , Thijs L. , Strating J. 
Published: September 2010

AbstractThe preparation of the chlorosulfines RC(Cl)=S=O where R is C6H5 and C6H5S, by oxidation of the corresponding thioacyl chlorides, is described. Reaction of these chlorosulfines with thiophenol and potassium thiocyanate leads to substitution of the chlorine atom giving phenylthio‐ and thiocyanosulfines, respectively. The displacement of the chlorine atom in chloro‐phenylsulfine by the phenylthio group occurs stereospecifically: the geometrical configuration of the chlorosulfine is predominantly retained in the product. A mechanism for these displacement reactions is proposed.
C‐Nitroso compounds. Part XVI: The reaction of C‐nitroso compounds with benzenesulfinic acid. An ESR study of alkyl and aryl benzenesulfonyl nitroxides
Authors: Wajer Th. A. J. W. , Geluk H. W. , Engberts J. B. F. N. , de Boer Th. J. 
Published: September 2010

AbstractDuring the reaction of aliphatic and aromatic C‐nitroso compounds (RNO) with benzenesulfinic acid, ESR spectra of alkyl and aryl benzenesulfonyl nitroxides (aN about 12 gauss, g = 2.0060) have been observed. Unequivocal evidence for the structure R(C6H5SO2)NO* is found in an independent preparation in situ by oxidation of N‐alkyl‐ or N‐aryl‐benzenesulfonylhydroxylamines.Sulfonyl nitroxides are also generated by photolysis of N‐methyl‐N‐nitrosotosylamide in hydrocarbons containing abstractable hydrogen atoms.A possible explanation for the rather large nitrogen hyperfine splitting constants of these nitroxides is discussed.