一些新的烯烃烷氧基铊(III)化合物,C6H5C(R1)(OR3)CH2Tl(OCOR2)2 [I],是由苯乙烯和α-甲基苯乙烯与乙酸铊(III)和异丁酸在各种醇中制备的。I(R1=H) 与碘化铜、溴化铜、氯化铜、氰化物和硫氰酸铜反应生成相应的烷基卤化物和拟卤化物,C6H5CH(OR3)CH2X[II],在各种有机溶剂中,乙腈是首选溶剂为了准备II。钾盐的加入对提高Ⅱ的收率有显着效果。卤代和假卤代脱卤发生在铊先前与烷基碳相连的位置。提出了一种离子协调的分子间方案作为制备 II 的反应机制。简要讨论了 I 的核磁共振和红外光谱数据。
A new class of chiral electrophilic thiocyanating reagents was designed and synthesized through an efficient protocol. These bench-stable and robust reagents were applied for the functionalization of electron-rich (hetero)arenes and the difunctionalization of alkenes.
Alkoxythiocyanation and Alkoxyiodination of Olefins with Copper(II) Salts
作者:Akira Onoe、Sakae Uemura、Masaya Okano
DOI:10.1246/bcsj.47.2818
日期:1974.11
alkoxythiocyano- and alkoxyiodoalkanes is described. The reaction of olefins with copper(II) salts, such as chloride, bromide and sulfate, and potassium thiocyanate or iodide in alcohols readily affords the compounds in good yields. Fromvinyl acetates, alkyl vinylethers and α,β-unsaturated aldehydes, the products are obtained in the form of dialkyl acetals. The reaction mechanism is discussed.
描述了一种简单方便的制备邻位烷氧基硫氰基和烷氧基碘代烷烃的方法。烯烃与铜 (II) 盐(例如氯化物、溴化物和硫酸盐)以及硫氰酸钾或碘化物在醇中的反应很容易以良好的收率提供这些化合物。由乙酸乙烯酯、烷基乙烯基醚和α,β-不饱和醛得到二烷基缩醛形式的产物。讨论了反应机理。
SYNTHESIS OF THIOCYANATES BY OXYTHALLATION OF OLEFINS
作者:Hiroshi Mitani、Takashi Ando、Yasuhide Yukawa
DOI:10.1246/cl.1972.455
日期:1972.6.5
A convenient method to introduce a thiocyano group into an olefin with thallium triacetate is described. The reaction proceeds via oxythallation, replacement of an acetate ion with a thiocyanate ion, and dethallation, successively.