bluuebunny/crossref_metadata_2025_split huggingface dataset:
A Conductance Study of the Complexation Reaction of Dibenzo-24-crown-8 with Alkali Metal Ions in Propylene Carbonate and Methanol
Authors: Takeda Yasuyuki , Yano Hisao 
Published: July 2006

Abstract
The formation constants (KML+) for 1: 1 complexes of dibenzo-24-crown-8 (DB24C8) with alkali metal ions (Na+, K+, Rb+, and Cs+) in propylene carbonate (PC) and methanol have been determined conductometrically at different temperatures in order to obtain the values of the enthalpy (ΔH) and entropy changes (ΔS). The complexation reactions between DB24C8 and the alkali metal ions in PC and methanol are all exothermic, and the ΔS values of these systems are all negative. In the case of the PC system, there is no considerable difference in ΔS among the alkali metal ions (Na+, K+, Rb+, and Cs+); thus, the KML+ sequences depend entirely on the −ΔH sequences. Since, in methanol, the −ΔH and −ΔS values for K+ are nearly equal to those for Cs+, and since the largest −ΔH value for Rb+ is balanced by the largest −ΔS value, DB24C8 shows no selectivity for the alkali metal ions (K+, Rb+, and Cs+) in methanol.
Stereochemistry of Base-catalysed Addition of Methyl Mercaptoacetate to Acetylenic Ketones and Esters. Effects of Activating Groups and Solvents
Authors: Basyouni Mohamed Nabih , Omar Mohamed Tawfik , Ghali Edwar Amin 
Published: July 2006

Abstract
Piperidine-catalysed addition of methyl mercaptoacetate to benzoyl- and p-chlorobenzoyl-phenylacetylenes in ethanol gave the corresponding (Z)-1-aryl-3-(methoxycarbonylmethylthio)-3-phenyl-2-propen-1-one. However, p-anisoylphenylacetylene gave a mixture of (Z)- and (E)-3-(methoxycarbonylmethylthio)-1-(p-methoxyphenyl)-3-phenyl-2-propen-1-ones in the ratio of 4:1. This ratio was completely inverted when the latter addition was carried out in dry benzene. Rationalisation of these results is presented which depends on the effect of activating groups and solvents on the stereochemistry of addition. Piperidine-catalysed addition of methyl mercaptoacetate to methyl phenylpropiolate in ethanol gave methyl (Z)-3-(methoxycarbonylmethylthio)cinnamate. Hydrazine hydrate converted some of the above mono-adducts into some pyrazole derivatives.
NMR Studies of Zerovalent Metal π-Complexes of Dibenzylideneacetone. III. Conformation and Bonding of the Mononuclear Palladium and Platinum Complexes
Authors: Tanaka Hisao , Kawazura Hiroshi 
Published: July 2006

Abstract
1H-NMR spectorscopy of the M[(C6H5CH=CH)2CO]3 (M=Pd,Pt) complexes revealed that the coordinated olefinic moieties are fixed in the s-trans form, while the uncoordinated ones are fluxional around the s-cis form. The fluxional behavior of the uncoordinated olefins was explained in terms of the π-back donation in the complexes.
The ENDOR Spectrum of 1,7,7-Trimethylbicyclo[2.2.1]heptane-2,3-dione Semiquinone in Solution
Authors: Tosa Reiko , Kotake Yashige , Okazaki Masaharu , Shikata Hideo , Kuwata Keiji 
Published: July 2006

Abstract
The ENDOR spectra of 1,7,7-trimethylbicyclo[2.2.1]heptane-2,3-dione semiquinone (camphorsemiquinone anion) showed a sharp temperature variation in the intensity of each ENDOR line. The relationship between the optimum temperature for the ENDOR enhancement and the relaxation mechanisms was discussed on the basis of the experimental results.
The Crystal Structures of Monoclinic and Triclinic Forms of Bis[(R)-1,2-propanediame]platinum(II) Chloride Dihydrate
Authors: Maeda Choji , Matsumoto Keiji , Ooi Shun’ichiro 
Published: July 2006

Abstract
The crystal structures of monoclinic and triclinic forms of [Pt(R-pn)2]Cl2·2H2O have been determined from diffractometer data. Despite the difference in crystal systems, the complex cations in the two kinds of crystals have essentially the same structure. The disposition of the CH3 groups is trans. One of the chelate rings is of the λ conformation, with an equatorial CH3 group, while the other has the δ conformation, with an axial CH3 group.
Studies on the Solvent Extraction of Metal Perchlorates. I. Partition of Sodium(I) between Aqueous Perchlorate, Thiocyanate, and Iodide Solution and Hexane Containing Trioctylphosphine Oxide
Authors: Kusakabe Satoshi , Sekine Tatsuya 
Published: July 2006

Abstract
Extraction equilibria of sodium (I) in aqueous 1 mol dm−3 sodium salt-hexane containing trioctylphosphine oxide systems were measured at 25 °C. The extracted species was always trisolvate, the extraction being improved in the order NaClO4&gt;NaSCN&gt;NaI&gt;NaNO3. This is explained in terms of the hydrofobic and hydrophilic tendencies of the anions.
The Copper(I) Iodide-assisted Reaction of Nonactivated Aryl Iodides with Some Alkali Metal Pseudohalides
Authors: Suzuki Hitomi , Miyoshi Keiko , Shinoda Misao 
Published: July 2006

Abstract
Copper(I) iodide dissolves into warm hexamethylphosphoric triamide to give a black solution, in which polymethylated iodobenzenes undergo nucleophilic attack by azide and selenocyanate ions, giving the corresponding aryl azides and selenocyanates in low to good yields. In the absence of copper(I) salt, however, the reaction does not take place. Cyanide, cyanate, thiocyanate, and fluoride ions bring about a decoloration of the reaction mixture and no displacement reactions ensue, while the tellurocyanate ion affords the corresponding aryl cyanides while liberating elemental tellurium.
Studies on Heterocyclic Analogs of Azulene. VII. Regioselective Cycloadditions of Cycloheptimidazole to Electron-deficient Olefins
Authors: Abe Noritaka , Nishiwaki Tarozaemon 
Published: July 2006

Abstract
Cycloheptimidazole reacted with electrondeficient olefins (e.g., ethyl acrylate or acrylonitrile) to give the regioselective [6+2] cycloadducts, which were readily dehydrogenated to give 2a,3-dihydro-1,2a-diazacyclopent[cd]azulenes.
Photochemical Reductive Acylation and Oxidative Acyl Activation on Phenazine and Related Nitrogen Heterocycles
Authors: Takagi Makoto , Goto Setsuo , Matsuda Tsutomu 
Published: July 2006

Abstract
Irradiation of phenazine in acetaldehyde or propionaldehyde solution gave an N-acylated 5,10-dihydrophenazine. Acridine similarly gave 9-acyl-9,10-dihydroacridine, and 10-methylacridinium salt gave 9-acyl-10-methyl-9,10-dihydroacridine. In methanol N-acylated dihydro-phenazines reacted with N-bromosuccinimide to give phenazine and methyl car boxy lates in quantitative yield.
Synthesis of 1,6-Dioxadispiro[2.0.4.4]dodecan-7-one
Authors: Kakiuchi Kiyomi , Hiramatsu Yasuhiro , Tobe Yoshito , Odaira Yoshinobu 
Published: July 2006

Abstract
1,6-Dioxadispiro[2.0.4.4]dodecan-7-one, a useful intermediate of dispiro-α-methylene-γ-butyrolactones, was synthesized in a good overall yield by the cycloaddition of dichloroketene to 1,2-dimethylenecyclohexane, and the zinc dust reduction of the chlorine atoms, followed by the Baeyer-Villiger oxidation with m-chloroperbenzoic acid.
Determination of Stoichiometry and Formation Constant of Molecular Complexes by Differential Refractometry
Authors: Sahai Ram , Singh Vinod 
Published: July 2006

Abstract
A more adequate method has been proposed to determine the stoichiometry and equilibrium constant of molecular complexes by Job method using differential refractometry in modification of Yoshida and Osawa method. This method has been verified on phenol-naphthalene system in cyclohexane at 35 °C. The equilibrium constant (K1=4.9±0.20 dm3 mol−1), obtained by this method is in good agreement with the literature value.
Studies on Complexes of Metal(II) Carboxylates with Donor Molecules. IV. Complexes of Nickel(II) Chloroacetates with Pyridine N-Oxides and Triphenylphosphine Oxide
Authors: Kumar Narsingh , Kachroo Piyara Lal , Kant Rama 
Published: July 2006

Abstract
Twelve green crystalline complexes with the general formula [Ni(O2CR)2·L]2 were prepared by the reaction of stoichiometric amounts of pyridine N-oxide, 2-methylpyridine N-oxide, 3-methylpyridine N-oxide, and triphenylphosphine oxide with nickel(II) mono-, di-, and trichloroacetates in methanol. The complexes were characterized by elemental analyses, conductance, magnetic moments, IR and electronic spectra as neutral, binuclear, carboxylato bridged species identical to those of copper(II) acetate monohydrate. The complexes involve varying degrees of magnetic interaction which diminishes with increasing chlorine substitution in the chloroacetate moiety.
Correlation Functions Calculated by Using Reference Interaction Site Model Equations for Diatomic Molecular Fluids
Authors: Kojima Kazumitsu , Arakawa Kiyoshi 
Published: July 2006

Abstract
The reference interaction site model (RISM) theory was applied to diatomic molecular fluids, by using three different forms of approximation for site-site direct correlation function. Applicability of the three forms of RISM equation, RISM-1, RISM-2, and RISM-3, was examined, site-site pair correlation functions being calculated from them and a comparison of the results with those of computer simulations being made. Structure factor for liquid nitrogen, oxygen, and bromine were obtained from the solution of the RISM-2 equation and compared with experimental results.
Reactions of Pentane and 2-Methylbutane over Solid Super Acids Prepared by Different Conditions
Authors: Takahashi Osamu , Yamauchi Takashi , Sakuhara Toshihiko , Hattori Hideshi , Tanabe Kozo 
Published: July 2006

Abstract
The reaction of pentane to 2-methylbutane was carried out at 0 °C over solid super acid catalysts which were prepared by treatment of various metal oxides with SbF5 under different conditions, and the preparation conditions that affect the catalytic behavior of the catalyst were examined. Among the different base metal oxides, TiO2–ZrO2 became the most active catalyst when treated with SbF5. The maximum conversion to 2-methylbutane which appeared in the reaction of pentane was high when a base metal oxide was treated with SbF5 at a low temperature, and also when the reaction temperature was low. At the maximum conversion, the selectivity of the catalysts for the skeletal isomerization was almost 100%. As the reaction of pentane proceeded, the catalytic activity for the skeletal isomerization to 2-methylbutane was decreased but that for the formation of 2-methylpropane from 2-methylbutane was increased. The reaction mechanism is briefly discussed.
Studies of the Interaction of Poly(ethylene oxide) with Sodium Dodecyl Sulfate by Gel Filtration
Authors: Sasaki Tsunetaka , Kushima Kaoru , Matsuda Kazunori , Suzuki Hitoshi 
Published: July 2006

Abstract
The interaction between poly(ethylene oxide) (PEO), with a molecular weight of 6000, and sodium dodecyl sulfate (SDS) was studied by the gel-filtration method. The elution curve of the PEO–SDS system showed a tail of the elution volume smaller than that of SDS micelles at a concentration larger than about 4 mmol dm−3. This suggests that the PEO–SDS (PS) complex is formed in the system. The dissolution-state diagram in the presence of PEO was then constructed in which the fractions of SDS single ions, SDS micelles, and the PS complex were shown against the SDS concentration. For a constant concentration of PEO, the molecular weight of the PS complex increased with the increase in the concentration of SDS up to the CMC of the PEO–SDS system, beyond which it became constant. The molecular weight of the PS complex was estimated to decrease from 21000 at 0.025 wt% PEO to 15000 at 0.2 wt% PEO.
Adsorption of Dyes, Chromate, and Metallic Ions by Poly(ethyleneimine)
Authors: Sasaki Tsunetaka , Asakawa Osamu , Kurosawa Kazuyo , Mizushima Minoru , Nakazono Teruhiro 
Published: July 2006

Abstract
Ion exchange and chelate properties of poly(ethyleneimine) resin (PEI) were studied. Adsorption of neucoccin anions (NC−) (maximum 1.7×10−4 mol/g) was greater than that of Crystal Violet cations (CV+) (maximum 0.17×10−4 mol/g), indicating that PEI is an anion exchanger. CV+ adsorption increased with the addition of sodium polyacrylate due to its bridging action between CV+ ions and PEI. Adsorption of CrO42− was confirmed to be much greater than that of NC− ions amounting to 4×10−3 mol/g at a sufficiently concentrated solution of CrO42−. The acid exchange capacity of PEI was found to be about the same as the maximum amount of adsorption of CrO42−. Kinetics of adsorption of CrO42− by PEI was studied at various temperatures. Adsorption followed a bimolecular reaction. Activation energy of 28.03×103 J/mol obtained is a right order of magnitude as an ion exchange adsorption. Chelating adsorption of Fe3+ and Cu2+ ions by PEI studied, the maximum amounts of adsorption being 3.1×10−3 mol/g and 3.3×10−3 mol/g, respectively. The values are greater than those for other synthetic polyethylene polyamine. PEI can be used as an anion and metallic cation adsorbent.
A Spectroscopic Study of Hydrogen-bonds Involving the 2-Thiouracil Residue
Authors: Todoriki Hidemi , Nishimura Yoshifumi , Higuchi Shigesada , Hirakawa Akiko Y , Tsuboi Masamichi 
Published: July 2006

Abstract
Infrared absorption spectra, ultraviolet absorption spectra, phosphorescence spectra, phosphorescence lifetimes, and phosphorescence excitation spectra have been examined of 1-propyl-2-thiouracil in various solvents, including CCl4, CH3OH, CCl4+CH3OH, and CCl4+9-ethyladenine. For 1-cyclohexyluracil, and for 2-S-propyl-2-thiouracil, similar infrared spectroscopic examinations were also made. The results obtained are as follows: (1) In CCl4, the 2-thiouracil residue forms a hydrogen-bond complex with the adenine residue, in which the C4=O is involved in the hydrogen-bond. (2) The binding of 2-thiouracil and adenine is much stronger than that of 2-thiouracil and CH3OH; the 2-thiouracil·methanol binding is stronger than the uracil·methanol binding. (3) The hydrogen-bonding of the 2-thiouracil residue (with CH3OH or with adenine) causes an elevation of the lowest singlet excited state S1, which is probably an 1(nπ*), from 2.5×104 cm−1 to 2.6×104 cm−1, and the lowest triplet excited state T15 which is probably an 1(nπ*), from 2.5×104 cm−1 to 2.6×104 cm−1. (4) The hydrogen bonding of the 2-thiouracil residue causes a great enhancement of the phosphorescence intensity. On the basis of these observations, a discussion is given on the nature of the inter-base hydrogen-bonds involving 2-thiouracil residue.
Branched-chain Sugars. XIX. On the Application of 13C NMR Spectroscopy to the Configurational Assignment of 3-C-Substituents of Aldohexopyranose Derivatives
Authors: Sato Ken-ichi , Matsuzawa Masafumi , Ajisaka Katsumi , Yoshimura Juji 
Published: July 2006

Abstract
It was found that 13C NMR spectroscopy is applicable to the unequivocal configurational assignment at the quarternary carbon in seven pairs of 3-C-substituted-hexopyranose derivatives. The configuration of methyl 4,6-O-benzylidene-3-C-nitromethyl-2-O-p-tolylsulfonyl-α-d-glucopyranoside reported by Jordaan et al. is revised to d-allo by a chemical method.
Pressure and Solvent Shifts of Absorption Spectra. II. Intramolecular Charge Transfer Bands
Authors: Sawamura Seiji , Taniguchi Yoshihiro , Suzuki Keizo 
Published: July 2006

Abstract
Absorption spectra of intramolecular CT bands of nitrobenzene, p-nitrophenol, p-nitroaniline, acetophenone, p-hydroxyacetophenone, and p-aminoacetophenone are observed in several nonpolar solvents at 1 bar, and in heptane up to 4400 bar. The fact that all solvent shifts are linearly red for the function of refractive index (n) of solvents, (n2−1)/(2n2+1), consists with the solvent shift theory. On the other hand, the pressure shifts are not straight but convex upward for (n2−1)/(2n2+1) and the red shifts by pressure exceeds the solvent shifts. The similar convex pressure shifts are found in 1Lb bands of several aromatic compounds by plotting the high pressure data of Robertson et al. in spite of the straight solvent shifts in these 1Lb bands measured by us. Therefore the convex pressure shift may be regarded as a general tendency of the electronic spectrum, being ascribed to decrease in the distance between a solute and the surrounding solvents by compression. From comparison with the pressure shift of the intramolecular CT band, it is suggested that, in the pressure shift of the intermolecular CT band of the I2 complexes shifted to red previously, the effect of decrease in the bond distance between a donor and an acceptor proposed by Offen and Nakashima contributes to not a red shift but a blue shift.
Diffusion Coefficients of Bolaform Electrolytes. Part II. Diffusion Coefficients of Magnesium 1,2-Ethanedisulfonate and Magnesium 1,4-Butanedisulfonate in Aqueous Solution
Authors: Uedaira Hisashi , Uedaira Hatsuho 
Published: July 2006

Abstract
The diffusion coefficients of magnesium 1,2-ethanedisulfonate and magnesium 1,4-butanedisulfonate in aqueous solutions have been measured at 25 °C. The concentration dependence of the diffusion coefficients of these salts was larger than those of the corresponding sodium salts. It has been shown that the 2:2 bolaform electrolyte behaves approximately like an ordinary 2:2 electrolyte. From these and previous results, it has been concluded that the diffusion behavior of bolaform electrolytes distinctively depend on the valency of the counterion.
Shapes of the ν1 Band of Liquid Chloroform and Intermolecular Interaction
Authors: Suzuki Tetsuo , Tsutsui Yumiko K , Fujiyama Tsunetake 
Published: July 2006

Abstract
The infrared absorption spectrum for the ν1 fundamental of chloroform or chloroform-d shows strong asymmetry, with a remarkable tailing on the high-frequency side. The observed band-width of the ν1 fundamental of chloroform-d is significantly narrower than that of chloroform. These asymmetric band profiles of the ν1 bands of chloroform and chloroform-d can be interpreted in terms of the existence of two different types of chloroform molecules. One is a molecule which interacts with another molecule, and the other is a non-interacting molecule. The isotope effect on the band-width can be explained in terms of the difference in the reduced mass for chloroform and chloroform-d.
Excess Volumes of Ternary Mixtures
Authors: Kato Masanao 
Published: July 2006

Abstract
An expression for excess volumes of multi-component mixtures was derived, and its applicability to the experimental values of ternary mixtures was demonstrated. It was found, in 1,2-dichloroethane+benzene+cyclohexane, ethanol+benzene+cyclohexane and ethanol+acetone+cyclohexane mixtures, that the agreements between the calculated and the experimental values were satisfactory.
A Study of Electronic Structure of 1,2,4,5-Tetracyanobenzene Anion Radical by Resonance Raman Effect
Authors: Yokoyama Kenji , Maeda Shiro 
Published: July 2006

Abstract
Resonance Raman spectrum of 1,2,4,5-tetracyanobenzene anion radical (TCNB−) was measured and compared with that of the neutral molecule (TCNB). Particularly, a Raman line assigned to C1C2 stretching vibration decreased its frequency remarkably when TCNB was converted to TCNB−. This decrease indicated that the lowest unoccupied molecular orbital (LUMO) of TCNB had a node on C1C2 bonding, showing that the LUMO belonged to an au species. Furthermore vibrational analyses of TCNB and TCNB− were carried out and the assignment of their Raman lines was confirmed.
Synthesis of a Partial Sequence of Proinsulin Using the A-Chain of Natural Insulin. III. Synthesis of a Peptide Corresponding to Positions 41–81 of Bovine Proinsulin
Authors: Aiba Hiroko , Shimonishi Yasutsugu 
Published: July 2006

Abstract
For the synthesis of bovine proinsulin, the S-sulfonate of the Leu–Glu–Gly–Pro–Pro–Gln–Lys[Z(2-Cl)]–Arg–A-chain, which was synthesized using the S-sulfonate of the A-chain of natural bovine insulin and which corresponds to positions 53–81 of bovine proinsulin, was coupled with Boc–Ala–Leu–Glu(OBut)–Leu–Ala–Gly–Gly–Pro–Gly–Ala–Gly–Gly–N3. After removal of the protecting groups from the resulting material the S-sulfonate of the Ala–Leu–Glu–Leu–Ala–Gly–Gly–Pro–Gly–Ala–Gly–Gly–Leu–Glu–Gly–Pro–Pro–Gln–Lys[Z(2-Cl)]–Arg–A-chain, corresponding to positions 41–81 of bovine proinsulin, was purified by chromatography on QAE-Sephadex A-25.
Kinetics of the Formation and Transformation of Alkoxy-derived Strontium Metaborate
Authors: Yamaguchi Osamu , Kamata Muneaki , Shimizu Kiyoshi 
Published: July 2006

Abstract
A new metastable SrB2O4 was formed by heating amorphous material prepared by the simultaneous hydrolysis of strontium and boron alkoxides. Crystallization isotherms were obtained by means of the Avrami equation ln(1−α)=−ktn with n=2, the activation energy being determined to be 351 kJ/mol. The kinetics of transformation of metastable into stable SrB2O4 is interpreted by the first-order equation −ln(1−α)=kt. Activation energies are 498 kJ/mol and 343 kJ/mol for initial and final stages, respectively.
Reactions of Halogeno-bridged Organopalladium(II) Complexes with an Electron-rich Olefin. New Cyclopalladated Carbene Complexes, and (Carbene)chloropalladium(II) Complexes Containing a σ,π-Methallyl Group or a π-Coordinated-chelating Alkyl-Palladium σ-Bond
Authors: Hiraki Katsuma , Sugino Keiichi , Onishi Masayoshi 
Published: July 2006

Abstract
A chloro-bridged organopalladium(II) complex, di-μ-chloro-bis(3-t-butylthio-2-methoxy-2-methylpropyl-1-C,S)dipalladium(II) reacted with an electron-rich olefin, bis(1,3-diphenyl-2-imidazolidinylidene) (L2) to yield a new dinuclear carbene complex, di-μ-chloro-bis(1,3-diphenyl-2-imidazolidinylidenato-2-C,2′-C)dipalladium(II) (4). Complex 4 was treated with thallium acetylacetonate, triisopropyl phosphite, 4-picoline, silver acetate, and L2, affording the corresponding new carbene complexes. On the basis of spectroscopic properties, these complexes were ascribed to new complexes containing cyclopalladated chelate structure in the carbene ligand. Di-μ-chloro-bis(1-3-η3-methallyl)dipalladium(II) and di-μ-chloro-bis(6-exo-methoxy-3a,4,7,7a-tetrahydro-endo-4,7-methanoindene-endo-5σ, 2π)dipalladium(II) reacted with L2 to give new mononuclear (carbene)chloropalladium(II) complexes possessing a σ,π-methallyl group and a π-coordinated-chelating alkyl-palladium σ-bond, respectively.
Synthesis of a Partial Sequence of Proinsulin Using the A-Chain of Natural Insulin. IV. Synthesis of a Peptide Corresponding to Positions 31–81 of Bovine Proinsulin
Authors: Aiba Hiroko , Shimonishi Yasutsugu 
Published: July 2006

Abstract
For the synthesis of bovine proinsulin, the S-sulfonate of the Ala–Leu–Glu–Leu–Ala–Gly–Gly–Pro–Gly–Ala–Gly–Gly–Leu–Glu–Gly–Pro–Pro–Gln–Lys[Z(2-Cl)]–Arg–A-chain, which corresponds to positions 41–81 of bovine proinsulin, was coupled with Boc–Arg(Tos)–Arg(Tos)–Glu(OBut)–Val–Glu(OBut)–Gly–Pro–Gln–Val–Gly–N3. The S-sulfonate of the Arg(Tos)–Arg(Tos)–Glu–Val–Glu–Gly–Pro–Gln–Val–Gly–Ala–Leu–Glu–Leu–Ala–Gly–Gly–Pro–Gly–Ala–Gly–Gly–Leu–Glu–Gly–Pro–Pro–Gln–Lys[Z(2-Cl)]–Arg–A-chain, correspoding to positions 31–81 of bovine proinsulin, was obtained in a pure form by removal of the protecting groups from the coupled product and chromatography on QAE-Sephadex A-25.
Synthetic Photochemistry. XVII. The Singlet-oxygen Oxidation of Vinylcyclopropane in the Presence of Diphenyl Sulfide. The Chemical Reduction of a Dioxetane to a cis-1,2-Glycol
Authors: Hatsui Toshihide , Takeshita Hitoshi 
Published: July 2006

Abstract
The singlet-oxygen oxidation of a spirocyclic vinylcyclopropane in the presence of diphenyl sulfide, a reducing agent, was shown to form a cis-glycol by the O–O cleavage of dioxetane. The determination of the stereochemistry of isomeric glycols obtained by chemical derivation led to a revision of the structure of the azido alcohol formed during the photosensitized oxygenation in a presence of the azide ion to the trans-derivative.