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A new polymer, poly[5-(trimethylgermylmethyl)-1,3-cyclopentylenevinylene], was synthesized via ROMP of 5-(trimethylgermylmethyl)-2-norbornene in the presence of RuCl 3 .3H 2 O, RuCl 3 (PPh 3 ) 3 and RuCl 2 (PPh 3 ) 3 catalysts. The structure of the synthesized polymer was determined on the basis of IR, 1 H NMR and 13 C NMR spectra. The gas transport properties for this polymer have been studied.

Bulky substituents, such as α-naphthyl and ferrocenyl groups, do not inhibit the metathesis of allylsilanes on a Re2O7/Al2O3-SnBu4, catalyst system. Metathesis represents a preparative synthetic method for the synthesis of 1,4-bis(α-napthyl-dimethylsilyl)- and 1,4-bis(ferrocenyldimethylsilyl)but-2-enes.

Dialkenyl derivatives of i-silacyclobutane and 1-silacyclopent-3-ene with double bonds β- and γ- to the silicon atom undergo metathesis over an aluminumrhenium catalyst to give silaspirocyclic compounds and open-chain organosilicon trienes containing the silacyclobutane and silacyclopentene fragments. Metathesis of allylbutenyl derivatives of silacyclobutane and silacyclopentene provides a convenient synthetic route to 4-silaspiro[3,5]non-6-enes and 5-silaspiro[4,5]deca-2,7-dienes.

1. It was shown that the efficient metathesis of dialkenylsilanes of variable structure in the presence of aluminum-rhenium catalysts is possible. 2. Conditions were found for the preparative synthesis of 4,9-disila-4,4,9,9-tetramethy1-1,6,11-dodecatriene and 1,1-dimethyl-1-sila-3-cyclohexene via the inter- and intramolecular metathesis reaction. 3. 1,1-Dimethyl-1-sila-3-cyclopentene polymerizes to a linear polysilapentenomer in the presence of Al-Re catalysts.

The feasibility was demonstrated for the efficient metathesis of phecyltolyl- and benzylallylsilanes on an alumorhenium catalyst promoted by tetrabutyltin. The metathesis of aryldimethylallylsilanes or aralkyldimethylallylsilanes is a preparative method for the synthesis of 1,4-bis(aryldimethylsilyl)-2-butenes or 1,4-bis(aralkyldimethylsilyl)-2-butenes.