A. A. Espenbetov

Crystal and molecular structure of Δ1,72,2,6,6-tetramethyl-4-thia-8,8,9,9-tetrachloro-8,9-digermabicyclo[5.2.0]nonene; The first representative of 1,2-digermacyclobutenes

The first representative of 1,2-digermacyclobutenes, Δ1,7-2,2,6,6-tetramethyl-4-thia-8,8,9,9-tetrachloro-8,9-digermabicyclo[5.2.0]nonene, and its structure by an X-ray crystallographic study.

New reactions of sulphur dichloride with olefines

Abstract The interaction between SCl 2 and adamantylideneadamantane produces epithiocompounds 2 and 3 or polychloroadamantylideneadamantanes 4 – 7 depending upon conditions. The structure of 3 was determined by X-ray analysis.

Synthesis of cyclic polyketone polyhydrazones and the X-Ray diffraction study of cyclobutanetetraone tetrakishydrazone

Conclusions1.A new reaction was found for cyclic fluoroolefins with hydrazines leading to hydrazones of alicyclic perketones. Thus, perfluorocyclobutene and 1,2-dichlorohexafluorocyclopentene gave cyclobutanetetraone tetrakishydrazone and cyclopentanepentaone pentakishydrazone, respectively.2.An x-ray diffraction structural analysis showed that cyclobutanetetraone tetrakishydrazone exists exclusively in the tetrakishydrazone form.

Stereochemistry, absolute configuration, and crystal structure ofcis-(4S,9S,10R)-1-(S-1-phenylethyl)decahydroquinolin-4-ol. Relative stereochemistry of cycloalkano-2,3-piperidin-4-ols

According to x-ray crystallographic data, thecis-isomer of 1-(1-phenylethyl)decahydroquinolin-4-ol, the predominant product of the stereoselective hydrogenation of1-(1--phenylethyl)-Δ9, 10-octahydroquinoline-4-one with sodium tetrahydroborate, has the (4S, 9S, 10R) configuration. The x-ray crystallographic data for this cisdecahydroquinolin-4-ol have been compared with the previously studied piperidin-4-ones of known absolute configuration. The stereochemical rules for cycloalkano-2,3-piperidine-4-ols are discussed.

Molecular structure of 2-phenyl-2-selenoxo-2-phosphabicyclo[4.4.0]decan-5-one

This paper reports on an X-ray diffraction study of one of the stereoisomers of 2-phenyl-2-selenoxo-2-phosphabicyclo[4.4.0]decan-5-one. The effect of the nature of the atom (O, S, Se) on bond lengths, bond angles, and conformation parameters in the series of stereoisomer heteroanalogs is considered.

Molecular structure of one of the stereoisomers of 2-thiono-2-phenyl-2-phosphabicyclo[4,3,0]nonane-5-one

i. A. Lang, Annu. Rev. Physiol., 21, 537 (1970). 2. D. R. Robinson and C. A. West, Biochemistry, 2, 80 (1970). 3. A. N. Chekhlov, A. i. Yurtanov, and I. V. Martynov, Kristallografiya, 31, 270 (1986). 4. A. E. Kalinin, D. S. Yufit, Yu. T. Struchkov, et al., Zh. Strukt. Khim., 25, No. 2, 114 (1984). 5. M. D. Walkinshaw, Acta Cryst., C42, 246 (1986). 6. H. Morssink and B. van Bodegom, Acta Cryst., B37, 107 (1981). 7. A. J. Bondi, J. Phys. Chem., 68, 441 (1964).

Stereochemistry of nitrogen heterocycles. 70. Conformation of 1-benzoyl-t-2-methyl-t-5-benzoyloxy-r-9-h-cis-decahydroquinoline and the nature of its complex with benzoic acid

ConclusionThe main product of the benzoylation of the hydrochloride of t-2-methyl-t-5-hydroxy-r-9-H-cis-decahydroquinoline, which exists in the conformation with the intramolecular H-bond, is the amidoester which can form a stable 1∶1 complex with benzoic acid having the strong OH... O=CN H-bond. The amidoester thereby exists in the conformation with the diaxial disposition of the substituents in the α,α′-positions of the piperidine ring.

Stereochemistry of nitrogen heterocycles. 66. Synthesis and x-ray diffraction analysis of C(4)-epimeric 1-methyl-trans-decahydro-4-quinolinols

C(4)-Epimeric 1-methyl-trans-decahydro-4-quinolinols, which are of interest as model compounds for stereochemical investigations, were obtained. It was shown by means of x-ray diffraction analysis that the crystalline compound that we synthesized and not the liquid compound described in the literature is the actual 1-methyl-trans-decahydro-4-quinolinol with an axial hydroxy group. Different pathways of weakening of the OH/H 1,3-syn-peri-planar repulsive interactions were observed: torsional twisting of the cyclic system for the equatorial alcohol and an increase in the O-C(4)-C(10) and C(4)-C(10)-C(5) bond angles. The previously unknown isomorphic forms of equatorial trans-decahydro-4-quinolinol and 1-methyl-trans-decahydro-4-quinolinol were obtained.

Crystal and molecular structure of 7,7-dimethyl-2,3-di(4-methoxyphenyl)-5-oxo-5,6,7,8-tetrahydroquinoline

An x-ray crystallographic investigation of 7,7-dimethyl-2,3-di(4-methoxyphenyl)-5-oxo-5,6,7,8-tetrahydroquinoline, obtained by the hydrolysis of its oxime, was undertaken. The oxime, together with the isomeric oxime of 7,7-dimethyl-2,4-di(4-methoxyphenyl)-5-oxo-5,6,7,8-tetrahydroquinoline, is formed in the reaction of 5,5-dimethyl-2-[1,3-di(4-methoxyphenyl)-3-oxopropyl]cyclohexane-1,3-dione with hydroxylamine hydrochloride.

Crystal and molecular structure of two isomers of 1,3-diphenyl-5-(1′,2′-dihydro-2′-methyl-4′-chloro-1′-phthalazinylidene)formazane

Conclusions1.An x-ray diffraction structural, analysis was carried out for the two crystalline forms of 1,3-diphenyl-5-(1′,2′-dihydro-2-methyl-4-chloro-1′-phthalazinylidene)formazane. These forms are geometrical isomers. Form A is the E1,2E2,3E3,4E4,5,C isomer, and form B is the E1,2E2,3E3,4E4,5E5,C isomer.2.The formazane group is planar in the E3,4 form, whereas it is nonplanar in the Z3,4 isomer, due to twisting of the phenylazo group about the N5-C10 bond by 64.0ℴ.3.The inverse dependence of the position of the maximum of the long-wavelength band in the UV spectra of the isomers studied relative to the reported dependence for previously described formazanes with planar structure of the formazane group in both isomers (the E1,2E2,3-Z3,4E4,5 isomers absorb at longer wavelengths than the E1,2E2,3E3,4E4,5 isomers) is a consequence of a change in the total chromophore system in going from one isomer to the other.