m.r.) spectrum of the 9,10-di-t-butyl compound shows that it has either a planar conformation of the central ring or the trans configuration with rapid interconversion of the two conformers. Homo-allylic coupling is observed in the n.m.r. spectra of 9-t-butyl-9,10-dihydroanthracene and 1-phenyl-1,4-dihydronaphthalene, in the latter case with a coupling constant of 6 c./sec.
二
硫代或二
硫代
蒽与叔丁基
氯反应,得到9-叔丁基和9,10-二叔丁基-
9,10-二氢蒽与一些1,4-二叔丁基的混合物-1,4-二氢
蒽。9,10-二叔丁基化合物的核磁共振(nmr)谱显示,它具有中心环的平面构型或具有两个构象体快速互变的反式构型。在9,叔丁基-9,10-二氢
蒽和1-苯基-1,4-二氢
萘的nmr光谱中观察到均烯丙基偶联,在后者情况下,偶联常数为6℃/秒。