Spectroscopic Characterization of (Iodomethyl)zinc Reagents Involved in Stereoselective Reactions: Spectroscopic Evidence That IZnCH<sub>2</sub>I Is Not Zn(CH<sub>2</sub>I)<sub>2</sub> + ZnI<sub>2</sub> in the Presence of an Ether
作者:André B. Charette、Jean-François Marcoux
DOI:10.1021/ja951171k
日期:1996.1.1
13C NMR spectroscopy is an extremely powerful technique for characterizing the (iodomethyl)zinc-derived reagents involved in the cyclopropanation reactions. This technique has allowed us to spectroscopically characterize and unambigously differentiate the Furukawa reagent (EtZnCH2I), the Simmons−Smith reagent (IZnCH2I), and the Wittig reagent (Zn(CH2I)2). Unique spectra are obtained for each of these
Solution- and solid-state structural studies of (halomethyl)zinc reagents
作者:Scott E. Denmark、James P. Edwards、Scott R. Wilson
DOI:10.1021/ja00033a036
日期:1992.3
(Halomethyl)zinc cyclopropanation reagents have been investigated by solution NMR and X-ray crystallographic methods. Treatment of glycol-ether complexes of diethylzinc with chloroiodomethane or diiodomethane quantitatively produced glycol-ether complexes of bi(chloromethyl)zinc and bis(iodomethyl)zinc, respectively. Similarly, treatment of acetone solutions of diethylzinc with either dihalomethane
(卤甲基)锌环丙烷化试剂已通过溶液核磁共振和 X 射线晶体学方法进行了研究。用氯碘甲烷或二碘甲烷处理二乙基锌的乙二醇-醚复合物,分别定量地产生双(氯甲基)锌和双(碘甲基)锌的乙二醇-醚复合物。类似地,用任一二卤甲烷处理二乙基锌的丙酮溶液产生相应的双(卤甲基)锌物质