S. V. Sereda

The isolation and x-ray crystal structure of Δ1,7 2,2,6,6-tetramethyl-4-thia-8,8-dimethyl-8-germabicyclo[5.1.0]octene; The first representative of germirenes

The first representative of germirenes, Δ1,7 2,2,6,6-tetramethyl-4-thia-8,8-dimethyl-8-germabicyclo[5.1.0]octene has been isolated and its X-ray crystal and molecular structure have been determined.

The crystal structure of 4-difluoromethoxybenzylidene-4′-(1″,1″,2″,2″,3″,3″,4″,4″-octafluorobutyl)aniline and modelling of the 4-methoxybenzylidene-4′-n-butylaniline crystal structure

Abstract The crystal and molecular structure of a non-mesogenic member of the series of mesogenic fluorinated 4-methoxybenzylidene-4′-n-butylaniline (MBBA) derivatives is described. Calculations based on atom-atom potentials were carried out to test the variability of the hypothetical crystal structures based on the MBBA derivatives studied by the authors and to build the variable crystal structures for the classical nematogen MBBA.

Synthesis of 2-amino-4,4-bis(trifluoromethyl)-3-cyano-1,4-dihydrobenzo[h]-quinoline

ConclusionsThe reactions of α-naphthylamine with 2,2-bis(trifluororaethyl)-1,1-dicyanoethylene leads to the formation of 2-amino-4,4-bis(trifluoromethyl)-3-cyano-1,4-dihydrobenzo[h]quinoline. The structure of this product was established by x-ray diffraction structural analysis.

Molecular structure of perfluoroolefin derivatives. 2. X-ray structural study of 3-p-cresoxyperfluoro-2-methylpent-2-ene

ConclusionsFeatures of the molecular geometry of 3-p-cresoxyperfluoro-2-methylpent-2-ene are established by x-ray structural studies. Opposing steric and electronic effects of the bulky and electronegative RF-substituents on the C atoms of the double bond in the perfluoroolefins are shown practically not to change the double bond length in comparison with ethylene.

5-Amino-3,3-bis(trifluomethyl)-1-phenyl-4-cyano-4-pyrazoline

ConclusionsThe reaction of phenylhydrazine with 1,1-dicyano-2,2-bis(trifluoromethyl)ethylene leads to 5-amino-3,3-bis(trifluoromethyl)-1-phenyl-4-cyano-4-pyrazoline, whose structure was proven by x-ray diffraction analysis.

Synthesis of 2-amino-4,4-bis(trifluoromethyl)-3-cyano-4,5-dihydro-1H-1,5-benzodiazepine

ConclusionsThe reaction of 1,2-phenylenediamine with 2,2-bis(trifluoromethyl)-1,1-dicyanoethylene leads to the formation of 2-amino-4,4-bis(trifluoromethyl)-3-cyano-4,5-dihydro-lH-l,5-benzodiazepine, whose structure was established by x-ray diffraction analysis.

C-alkylation of indoles with imines and hexafluoroacetone azine

Conclusions1.The possibility of C-alkylating indole with hexafluoroacetone azine was shown. The structure of the resultant 3-[2,5-di-(trifluoromethyl)-3,4-diaza-3H-perfluorohex-4-en-2-yl]indole was proved by x-ray structural analysis.2.The special features of the reaction of hexafluoroacetone imines with 2-methyl- and 2-phenylindoles were studied.