PROCESS FOR PREPARING 1 5 9-CYCLO-DODECATRIENES

摘要

1278812 Polymerisation catalysts TOAGOSEI CHEMICAL INDUSTRY CO Ltd 12 Aug 1969 [17 Aug 1968 21 Aug 1968 (2) 22 Aug 1968] 40359/69 Heading B1E [Also in Division C5] A catalyst for the trimerisation of a conjugated diene to form 1,5,9-cyclododecatriene or a derivative thereof (see Divisions C2, C3 and C5) comprises a mixture of an alkylaluminium chloride and a compound of the formula: in which R is an alkyl or aryl group, R" is an alkyl, aryl or aralkyl group, R' is a hydrogen atom or an alkyl group, and n is 2, 2.5 or 3; or in which R is an alkyl, aralkyl or aryl group, R' is a hydrogen atom or an alkyl group, and n is 2, 2.5, or 3; or in which R is an alkyl or aryl group, and n is 2 or 3; or in which Y is an a-halo substituted acetoxy group and n is 2 or 3. Extensive lists of preferred alkylaluminium chlorides and chlorotitanium compounds are given. The chlorotitanium compounds may be prepared by the reaction of TiCl 4 and a #-keto-ester, and #-keto aldehyde, a phenyl #-diketone, or an a-halo substituted acetic acid or alkali metal salt thereof in a nitrogen atmosphere and an aliphatic, alicyclic, or aromatic hydrocarbon solvent. The atomic proportion of aluminium to titanium in the catalyst may be at least 2:1 and is preferably 10-500:1. The catalyst is preferably aged before use.