Tributylstannane → Z-1-tri-n-butylstannyl-3-trimethylsilyloxy-4,4-dimethyl-1-octene

Beteiligte Stoffe

Reaktionsbedingungen

Reaktionsschritte

A mixture of 2 g (8.83 mmole) of 3-trimethylsilyloxy-4,4-dimethyl-1-octyne [prepared from 3-hydroxy-4,4-dimethyl-1-octyne U.S. Pat. No. 4,007,210 and chlorotrimethylsilane (Method of Example 1)], 10 mg of azobisisobutyronitrile and 2.09 ml (7.9 mM) of tri-n-butylstannane is stirred in an oil bath under argon atmosphere at ambient temperature and then the temperature is gradually raised to 130° C. The resulting solution is stirred at 130°-135° C. for 2 hours, then cooled to furnish Z-1-tri-n-butylstannyl-3-trimethylsilyloxy-4,4-dimethyl-1-octene. Vapor phase chromatography on a 6'5% SE 30 column at an oven temperature of 230° C. shows a peak at retention time of 5.2 minutes. Further treatment of this solution containing the Z isomer with additional tri-n-butylstannane (3-4 mmole) and azobisisobutyronitrile (20 mg) at 130°-135° C. for 4-hour furnishes E-1-tri-n-butylstannyl-3-trimethylsilyloxy-4,4-dimethyl-1-octene. Vapor phase chromatography shows a peak at retention time of 4.7 minutes.

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