two-step synthesis of 2-acetyl and 2-carbethoxy-phospholes involves the metalation of monomeric 3,4-dimethyl phosphole sulfides by t-butyl-lithium followed by reaction with ethyl acetate and ethyl carbonate. The phosphole sulfides thus obtained are reduced by PBu3 or P(CH2CH2CN)3 to the phospholes 20–24. In the 2-acetyl-phosphole series, variable electron transfer from the dienic system and from the phosphorus
2-乙酰基和2-乙氧基-
磷的两步合成涉及通过
叔丁基锂将单体的3,4-二甲基
磷硫化物金属化,然后与
乙酸乙酯和
碳酸乙酯反应。由此获得的
磷杂环
硫化物通过PBU降低3或P(CH 2 CH 2 CN)3至phospholes 20 - 24。在2-乙酰基-
磷系列中,通过1 H和31 P NMR监测从二烯系和从
磷原子到羰基的可变电子转移。2-羧基
磷脂25的主要分解途径与
吡咯和
噻吩衍
生物26和27形成鲜明对比的是,质谱仪中的P involvesC涉及PC环内键裂解和CO的损失。这些事实妨碍强2 p π -3 p π在
磷杂核电子离域。