Solvent-free cyclization of linear dienes using olefin metathesis and the Thorpe-Ingold effect
作者:Malcolm D. E. Forbes、Jasson T. Patton、Tanya L. Myers、Heather D. Maynard、Dennis W. Smith、Gregory R. Schulz、Kenneth B. Wagener
DOI:10.1021/ja00053a054
日期:1992.12
The olefin metathesis reaction is of great synthetic utility in polymer chemistry. The recent development of ring-opening (ROMP) and acyclic diene (ADMET) metathesispolymerization reactions has opened new avenues for the synthesis of novel polymeric materials. Recently the authors used ADMET to synthesize several photochemically active poly(keto olefins) using the catalyst Mo(CHCMe[sub 2]Ph)(NAr)(OCMe(CF[sub
Proton addition to silylstyrenes: Overcoming the predilection for protiodesilylation
作者:Courtney Henry、Michael A. Brook
DOI:10.1016/s0040-4020(01)89280-2
日期:1994.1
allylsilanes undergo protiodesilylation reactions with protons. To favour additionreactions under these conditions, the ligands on silicon have been modified such that the leaving group ability and, simultaneously, the β-effect of the silyl group is reduced. In the case of allylsilanes, the use of dichlorosilyl groups does not significantly favour addition over substitution processes at the olefin
The optimum pH for the emulsion polymerization of hexamethylenedithiol and diallyldimethylsilane was found to be in the region of 3.0 to 4.0. A variety of polyalkylenesulfides containing silicon were prepared using bulk, solution, and emulsion polymerization techniques. All of the polyalkylenesulfides which contained silicon were heavy oily materials which were very “tacky”.