The unusual behaviour of nitro-substituted radical σ-complexes. The reactions of alkyl radicals with 9-nitroanthracene
作者:Lorenzo Testaferri、Marco Tingoli、Marcello Tiecco
DOI:10.1039/p29830000543
日期:——
Alkyl radicals react with 9-nitroanthracene to give the nitro-substituted σ-complex intermediate (III) derived from addition at the 10-position. This radical does not rearomatize, but gives rise to rearrangement of the nitro-group which eventually leads to the formation of alkylanthrones. However, in the presence of stabilized radicals, intermediate (III) is trapped to give products of addition at
烷基与9-硝基蒽反应,生成由10位加成衍生而来的硝基取代的σ-络合物中间体(III)。该基团不会重新排列,而是引起硝基的重排,最终导致烷基蒽酮的形成。然而,在稳定基团的存在下,中间体(III)被捕集以在9位和10位获得加成产物。在某些情况下,这些后面的产物可能会吸氢,然后消除NO 2 ·基团,得到9,10-二烷基蒽。