Quinones. Part 14. Attempted synthesis of 9,10-dimethyl-2,6-anthraquinone. Desmotropic formation of secondary ortho-anthraquinoles instead of 1,2-anthrahydroquinones
作者:Peter Boldt、Stephan Zippel、Michael Ratzkowsky
DOI:10.1039/p19960002615
日期:——
In connection with PMO calculations on the reactivity of quinones, we attempted to synthesize 9,10-dimethyl-2,6-anthraquinone 3a by oxidising 2,6-dihydroxy-9,10-dimethylanthracene 2. Even under exclusion of water, only addition products of water to 3a, viz. the secondary ortho-anthraquinols 1,6-dihydroxy-9,10-dimethylanthracen-2(1H)-one 4 and 2,6-dihydroxy-9,10-dimethylanthracen-1(2H)-one 6, could be isolated. The fully aromatic tautomer of compounds 4 and 6, 1,2,6-trihydroxy-9,10-dimethylanthracene 5 could not be detected. Acyloins 4 and 6 represent the first examples of secondary ortho-anthraquinoles.
在PMO计算醌的反应性时,我们试图通过氧化2,6-二羟基-9,10-二甲基蒽2来合成9,10-二甲基-2,6-蒽醌3a。即使排除水,也只能分离出3a与水的加成产物,即二级邻位蒽醌1,6-二羟基-9,10-二甲基蒽-2(1H)-酮4和2,6-二羟基-9,10-二甲基蒽-1(2H)-酮6。化合物4和6的全芳香互变异构体1,2,6-三羟基-9,10-二甲基蒽5无法检测到。酰蒽酮4和6是二级邻位蒽醌的第一个例子。