essentially to a mixture of the expected ether, 9-phenoxy (or alkoxy)-10-methyl anthracene 2, normal substitution product (NSP), and of the isomer ether, 9-phenoxymethyl (or alkoxymethyl)-anthracene 3, tele-substitution product (TSP). It is shown that both ethers must derive from a common unstable intermediate, the 9-bromo-10-methylene-9,10-dihydroanthracene 8, coming from 1 by a prototropic shift and which can
在偶极非质子溶剂中用碱性
酚盐或醇盐处理9-
溴-10-甲基
蒽1基本上导致预期的醚,9-苯氧基(或烷氧基)-10-甲基
蒽2的混合物,这是正常的取代产物( (N
SP),和异构体醚中的9-苯氧甲基(或烷氧甲基)-
蒽3,远程取代产物(T
SP)。结果表明,这两种醚都必须衍生自一种常见的不稳定中间体9-
溴-10-亚甲基-
9,10-二氢蒽8,它通过质子转移从1衍生而来,并且可以进行两种取代。