SILYL ISOXAZOLINES .2. SYNTHESIS, STRUCTURE AND PROPERTIES

Silyl isoxazolines have been synthesized by [2 + 3] cycloaddition reac tion of nitrile oxides and silylnitronates to vinyl- and allylsilanes. The direction of the cycloaddition reaction of nitrile oxides to tria lkoxyvinylsilanes has been shown to depend on the nature of the substi tuents on silicon and on the method used to generate the nitrile oxide s. The addition of silyl esters of aci-nitromethane to triethoxyvinyls ilane gives both 5-silyl and 4-silyl isomers. The structures of silyl isoxazolines are discussed.