The 8-methyl group of riboflavin and lumiflavin is shown to be activated, in agreement with B. & A. Pullman's LCAO-MO-model. Chemical evidence for this is given by reactions of 8-chloro-7,10-dimethyl-flavin with nucleophilic agents, of 8-methylflavins with NO and CO groups, and by the base-catalysed dimerisation of 8-methylflavins giving rise to a new class of flavin-like pigments. The particular redox-behaviour
与B.&A. Pullman的LCAO-MO模型相符,
核黄素和lumiflavin的8-甲基被激活。8-
氯-7,10-
二甲基黄素与亲核试剂的反应,具有NO和CO基团的8-
甲基黄素的反应以及8-
甲基黄素的碱催化二聚产生了新的
化学证据。类黄素类
颜料。描述了这些“双黄素”的特定氧化还原行为,并讨论了其可能的生化重要性。