Abstract The effect of pyrolysis of the acyl group substituted on ä-position carbon in S-ethyl group of ethyl phenyl sulfoxide was investigated by using two kinds of substrates, l- ethoxycarbonylethyl phenyl sulfoxide (1) and l-ethoxycarbonyl-l-methylethyl phenyl sulfoxide (2) together with 2-methoxycarbonylethyl phenyl sulfoxide (4). The rate of pyrolysis of (1) was found to be about 740∼ 890 times faster than that of ethyl phenyl sulfoxide (5), ...
