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Valery P Juriev

Alexandr G Liakumovich

Boris S Korotkevich

Jury A Shmuk

Genrikh A Tolstikov

Jury Ivanovich Michurov

Valerian Mikhailovich Sobolev

Boris Izrailevich Pantukh

Grigory I Rutman

Sagid R Rafikov

Elena Yakovlevna Mandelshtam

Vasily P Popov

Sofia A Egoricheva

Boris I Pantukh

Elena Y Mandelshtamm

Mengzda K Sultanova

Usein M Dzhemilev

Jury B Monakov

Stanislav S Shavanov

A method of preparing trans-, trans-, trans-1,5,9-cyclododecatriene which comprises cyclotrimerization of butadiene at a temperature within the range of from 50.degree. to 150.degree. C. in the presence of a catalytic system consisting of a compound of bivalent nickel, an organo-aluminium compound of the formula (1) or (2):

Method of preparing trans-, trans-, trans-1,5,9-cyclododecatriene

A process for preparing cis-polyisoprene which comprises polymerization of isoprene in a medium of a non-polar hydrocarbon solvent at a temperature ranging from 0.degree. to 60.degree. C in the presence of a catalyst comprising a reaction product of titanium tetrachloride and an intracyclic organo-aluminium compound having the formula: ##STR1## wherein R, the same or different, are H, CH.sub.3 ; taken in a molar ratio of 1:1.05-1.1 respectively; weight ratio of isoprene to said catalyst being equal to 100:0.2-0.7. The present invention makes it possible to improve the quality of the thus-obtained cis-polyisoprene and to increase the catalyst capacity by two times due to modification of its properties.

Process for preparing cis-polyisoprene

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Bashkirskaya ASSR, Ufa, undefined

Valery P Juriev