Synthesis and structures of bimetallic silicon-containing imido alkylidene complexes of molybdenum Me_2Si[CHMo(NAr)(OR_(F3)) _2]_2 and PhVinSi[CHMo(NAr)(OR_(F3)) _2]_2

摘要

Bimetallic alkylidene complexes of molybdenum (R_(F3)O) _2(ArN)MoCH-SiMe_2-CHMo(NAr)(OR_(F3))_2 (1) and (R_(F3)O)_2(ArN)MoCH-SiPhVin-CHMo(NAr)(OR _(F3))_2 (2) (Ar = 2,6-Pr2iC_6H_3; R _(F3)= CMe_2CF_3) have been prepared by the reactions of vinyl silicon reagents Me_2Si(CHCH_2) _2 and PhSi(CHCH_2)_3 with known alkylidene compound PhMe_2C-CHMo(NAr)(OR_(F3))_2. Complexes 1 and 2 were structurally characterized. Ring opening metathesis polymerization (ROMP) of cyclooctene using compounds 1 and 2 as initiators led to the formation of high molecular weight polyoctenamers with predominant trans-units content in the case of 1 and predominant cis-units content in the case of 2.