No abstract

The palladium-catalyzed dehalogenation reaction of alkyl or aryl halides with triethylsilane takes place, giving high yields under mild reaction conditions. The efficiency of the reduction is similar for organic chlorides, bromides, or iodides, and the presence of functionalities such as esters or ethers does not interfere with the outcome of the reaction.

3-ene, and 1,1 -dimethyl-1 -germacyclopent-3-ene undergo ring-opening polymerization catalyzed by alkyllithium reagents in the presence of hexamethylphosphoramide or , , ', -tetramethylethylenediamine to yield respectively poly(l,l-dimethyl-l-sila-cis-pent-3-ene), poly(l-methyl-l-phenyl-l-sila-cis-pent-3-ene), poly(l,l-diphenyl-l-sila-cis-pent-3-ene), poly(l,l,3-trimethyll-sila-Cí's-pent-3-ene), and poly(l,l-dimethyl-l-germa-cts-pent-3-ene). These polymers have been characterized by , 13C, and MSi NMR spectroscopy. Their molecular weight distributions have been determined by gel permeation chromatography. Their thermal stability has been measured by thermogravimetric analysis. The mechanism of this novel ring-opening polymerization is discussed.

No abstract