In a preceding communication [5] it was shown that 1, 5-dimethyl-6-methylene-tricyclo[3.2.1.02,7]oct-3-en-8-one (2) and related tricyclic ketones are converted by strong acids (CF3COOH, FSO3H) into polymethylated tropylium salts with loss of carbon monoxide, e.g. the 1, 2, 4-trimethyltropylium ion 4 from 2 (Scheme 1).
在先前的文献[5]中,表明1,5-二甲基-6-亚甲基-
三环[3.2.1.0 2,7 ] oct-3-en-8-one(2)和相关的
三环酮被强力转化酸(CF 3 COOH,FSO 3 1H)与
一氧化碳的损失,polymethylated卓鎓盐例如1,2,4-trimethyltropylium离子4从2(方案1)。