Abstract
AbstractPolymerization of ethylene oxide (EO) and propylene oxide (PO) catalyzed by two types of triphenylstibine oxide ((C6H5)3SbO, TPSO) was investigated. The polymeric and high melting point triphenylstibine oxide (TPSOa) was found to be active, but it shows a long induction period in the polymerization at 80°C. During the induction period, TPSOa is probably cleaved into an active antimony species by interaction with EO. TPSOa is activated by addition of some O‐containing compounds such as ethanol, 1,4‐dioxane, or water. Monomeric and low melting point triphenylstibine oxides (TPSOb and TPSOc) were found to be inactive. Their activity markedly increases by addition of Lewis bases such as triphenylphosphine. The difference in the activity of TPSOa and TPSOb or TPSOc is considered to result from differences in aggregation.
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