An annelated[13]annulenone (3) was prepared starting from o-ethynylbenzaldehyde 1 in order to examine the effect of annelation on the ring current of the inner thirteen membered ring. It was found that two benzene rings reduce a paramagnetic ring current arising from polarization of a carbonyl group in the inner ring.
从邻
乙炔基
苯甲醛1开始制备了稠合的[13]轮烯酮(3),以检查稠合对内部十三元环的环电流的影响。发现两个苯环减少了由内环中的羰基极化产生的顺磁环电流。