POLYACYLATION OF PROPENE DERIVATIVES - AL LYLTRIMETHYLSILANE AS PRECURSOR

The polyacylation of allyltrimethylsilane in Friedel-Crafts medium, pe rformed for the first time, gave pyrylium salts. The diacetylation of allyltrimethylsilane under Friedel-Crafts conditions was studied by an experimental design. The yield in 2,6-lutidine (obtained from 2,6-dim ethylpyrylium salt by an in situ treatment with aqueous ammonia) deter mined by CPV analysis was 23%. The influence of treatment for transfor mation into pyridines on the yield in 2,6-lutidine and on the formatio n of tri- and tetraacylation products was also studied. The diacetylat ion of allyltrimethylsilane in protonic medium leads to traces of 2,6- lutidine.