摘要:
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):R.sub.3 Al (1)andR.sub.2 Al--X (R').sub.n (2)wherein R, and R' are each C.sub.2 H.sub.5 --, ##STR1## X is --O-- when n=1 and --N-- when n=2; and an activator, viz. a compound of formula (3) or (4):R.sub.3 Si--OR' (3)wherein R is an alkyl; R' is an alkyl, C.sub.6 H.sub.5 --, C.sub.6 H.sub.11,N(CRR'--CRR"--O).sub.3 B (4)wherein R and R" are each CH.sub.3 --, C.sub.2 H.sub.5 --, C.sub.6 H.sub.10, C.sub.8 H.sub.11 --, H--; R is H--.The method according to the present invention makes it possible to increase the yield of the desired product up to 95% by weight.
摘要翻译:制备反式,反式,反式-1,5,9-环十二碳三烯的方法,其包括在由化合物组成的催化体系存在下,在50℃至150℃的温度范围内使丁二烯循环三聚化 的二价镍,式(1)或(2)的有机铝化合物:R3Al(1)和R2Al-X(R')n(2)其中R和R'各自为C 2 H 5 - , 当n = 1时,X为-O-,n = 2时为-N-; 和激活剂,即 式(3)或(4)的化合物:R3Si-OR'(3)其中R是烷基; R'是烷基,C 6 H 5 - ,C 6 H 11,N(CRR'-CRR“-O)3B(4)其中R和R”各自为CH 3 - ,C 2 H 5 - ,C 6 H 10,C 8 H 11 - ,H-; R是H-。 根据本发明的方法使得可以将所需产物的产率提高至95重量%。
摘要:
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.