ISOMERIZATION OF ALLYLTRISUBSTITUTED SILANES AND DECENES ACCOMPANYINGTHEIR COMETATHESIS IN THE PRESENCE OF RUTHENIUM COMPLEXES

It was found that the product of cometathesis of allyltrisubstituted s ilanes acid 1-decene in the presence of different complexes of rutheni um was (E)- and (Z)-R(3)SiCH=CHR(1) (R = Me or EtO; R(1) = n-C8H17.). The cometathesis was accompanied by the migration of a double bond in allylsilanes and 1-decene. The isomerization of allyltrisubstituted si lanes to appropriate propenyltrisubstituted silanes as well as of 1-, 2-, and 4- alkenes to isomeric alkenes in the presence of ruthenium co mplexes was investigated too. It was proved that the migration of a do uble bond is accompanied by (E) - (Z) isomerization. Products of the f irst stage of the migration reaction are mainly (E) isomers. Isomeriza tion proceeds at lower temperatures than cometathesis. Tectrachloroeth ylene as a solvent was favorable for isomerization, but it inhibited c ometathesis.