Redox Reaction of Aromatic Aldehydes with Fe<sub>3</sub>(CO)<sub>12</sub>
作者:Keiji Itoh、Saburo Nakanishi、Yoshio Otsuji
DOI:10.1246/bcsj.64.118
日期:1991.1
Aromatic aldehydes react with Fe3(CO)12 in refluxing benzene ultimately to give arylmethyl alcohols and 1,2-diaryl-1,2-ethanedione in a 1:1 ratio. In some cases, small amounts of 2,4,5-triaryl-1,3-dioxolanes are formed as minor products. Dinuclear iron complex (1,2-diphenyl-1,2-ethanedioxido)Fe2(CO)7 has been isolated as an intermediate in the reaction of benzaldehyde with Fe3(CO)12. The mechanism of this
Highly active magnesium (Rieke magnesium) reacts with fluorohalomethanes at −100 °C forming the corresponding fluorohalomethylmagnesium halides, which undergo nucleophilic substitution with silyl halides or nucleophilic addition with aldehydes or ketones. Whereas the stability of dibromofluoromethylmagnesium bromide (2a) was sufficient to provide acceptable product yields with dimethylphenylsilyl chloride
utilized low-valent titanium reductant, titanium(II) bromide, was conveniently prepared by treating titanium(IV) bromide with hexamethyldisilane. The pinacol reaction of aromatic and aliphatic aldehydes including primary aldehydes proceeded smoothly in dichloromethane-pivalonitrile at temperatures ranging from −23 to 0 °C by the combined use of soluble titanium(II) bromide and copper to give 1,2-diols in good
新使用的低价钛还原剂溴化钛 (II) 可以通过用六甲基乙硅烷处理溴化钛 (IV) 方便地制备。芳香族和脂肪族醛(包括伯醛)的频哪醇反应在二氯甲烷-新戊腈中,通过可溶性溴化钛(II)和铜的联合使用,在 -23 至 0 °C 的温度范围内顺利进行,得到 1,2-二醇。高产率和高 dl 选择性。
Fürstner, Alois; Hupperts, Achim, Journal of the American Chemical Society, 1995, vol. 117, # 16, p. 4468 - 4475