Synthesis and Trapping of Transient 1,2-Diselones To Yield 1,4-Diselenin Derivatives: Calculated Structures of 1,2-Diselones, 1,2-Diselenetes and Their Sulfur Analogues
作者:Antony Chesney、Martin R. Bryce、Shimon Yoshida、Igor F. Perepichka
DOI:10.1002/(sici)1521-3765(20000403)6:7<1153::aid-chem1153>3.3.co;2-e
日期:2000.4.3
4-diselenin derivatives. The route via 15 is especially expedient and trapping of 16 is efficient. Subsequent reactions of adduct 17 afford [1,2-ethanediylbis(diphenylphosphane)] [5,6-bis(methoxycarbonyl)-1,4-diselenin-2,3-dithiolato]nickel(IV) (20). Theoretical calculations at Hartree-Fock (HF) and Moller-Plesset electron-correlated levels (MP2) suggest that the cyclic 1,2-diselenete structure 7c is
报道了两种在概念上不同的过渡至瞬态1,2-二酮的途径:1)通过1,4,2-二硒嗪系统6的环断裂,以及2)由三丁基膦诱导的耐贮存的有机硒聚合物15解聚。在两种情况下,通过用乙炔二羧酸二甲酯(DMAD)原位捕获以产生1,4-二硒精衍生物,提供了中间体1,2-二硒酮物质7和16的化学式。通过15的路径特别方便,而捕获16则非常有效。加合物17的后续反应得到[1,2-乙二基双(二苯基膦)] [5,6-双(甲氧羰基)-1,4-二硬脂酸-2,3-二硫代硅烷]镍(IV)(20)。在Hartree-Fock(HF)和Moller-Plesset电子相关能级(MP2)上进行的理论计算表明,环状1,2-二硒代结构7c比非环状1,2-二硅酮结构7a。对于双环体系16,由于稠合的1,3-二硫醇环施加的构象刚性,大大降低了环状结构和非环状结构之间的能量差。相反,计算1,2-二硫酮类似物13a和25a的非环状结构比它