The oxidation of secondary alcohols and primary alcohols with novel ion-supported (diacetoxyiodo)benzenes (IS-DIB) in the presence of a catalytic amount of 2,2,6,6-tetramethylpiperidine-1-oxy radical (TEMPO) in dichloromethane at room temperature proceeded efficiently to provide the corresponding ketones and aldehydes, respectively, in good yields with high purity. Isolation of the product was easily
Regiocontrolled coupling of (.pi.-allylic)palladium complexes with organozirconium species
作者:James S. Temple、Martin Riediker、Jeffrey Schwartz
DOI:10.1021/ja00369a028
日期:1982.3
Hydroxy-steroids. Part X. The preparation and properties of<scp>A</scp>-homo-5α-cholestan-4-one
作者:G. D. Meakins、D. J. Morris
DOI:10.1039/j39670000394
日期:——
The formation of A-homo-5α-cholestan-4-one from 5α-cholestan-3-one and diazomethane (N. A. Nelson and R. N. Schut, J. Amer. Chem. Soc., 1959, 81, 6486) was re-investigated. Using pre-formed diazomethane in ether–methanol the reaction was very slow. However, in the presence of potassium hydroxide ring expansion occurred smoothly to give a mixture from which the A-homo-4-ketone was readily isolated.