Macromolecules, Vol.34, No.13, 4384-4389, 2001
Silacyclobutane as "carbanion pump" in anionic polymerization. 2. Effective trapping of the initially formed carbanion by diphenylethylene
The initially formed carbanion from dimethylsilacyclobutane and potassium tert-butoxide was trapped in as high as 88% yield in the presence of 1,1-diphenylethylene as evidenced by quenching with methyl iodide. The initiator efficiency of 76% was obtained by using a combination of potassium tert-butoxide, dimethylsilacyclobutane, and 1,1-diphenylethylene carbanion pump system as an initiator in the polymerization of methyl methacrylate.