A Safe, Convenient and Efficient One-Pot Synthesis of α-Chloroketone Acetals Directly from Ketones Using Iodobenzene Dichloride
作者:Chi Zhang、Jun Yu
DOI:10.1055/s-0029-1216856
日期:2009.7
aliphatic and aromatic ketones, can be directly converted into their corresponding α-chloroketone acetals in high to excellent yields using iodobenzenedichloride in ethylene glycol in the presence of 4 Å molecular sieves at room temperature. ketones - iodobenzene - dichloride - halogenation - hypervalent iodine - acetals
PROCESS FOR PRODUCTION OF OPTICALLY ACTIVE COMPOUND
申请人:Ishii Yutaka
公开号:US20110288315A1
公开(公告)日:2011-11-24
A 2-aryl-2-halomethyl-4-chloromethyl-1,3-dioxolane (A) can be produced conveniently without decreasing its optical purity by reacting an optically active monochlorohydrin and an aryl (halomethyl) ketone (starting materials) with each other in the presence of an acid catalyst. From the optically active compound (A) thus produced, an optically active carboxylic acid (2-aryl-2-halomethyl-1,3-dioxolan-4-yl)methyl ester and an optically active sulfonic acid (2-aryl-2-halomethyl-1,3-dioxolan-4-yl)methyl ester (both of which are useful intermediates for the production of ketoconazole) can be produced with good efficiency. An optically active trans-carboxylic acid (2-aryl-2-halomethyl-1,3-dioxolan-4-yl)methyl ester can be isomerized into its cis-form in the presence of an acid catalyst.
Free radical reactions in solution. Part 6. Thermal decomposition of substituted dibenzyl mercurials in solution. An improved σ˙ scale
作者:Suphi Dinçtürk、Richard A. Jackson、Michael Townson、Hikmet Aǧirbaş、Norman C. Billingham、Gary March
DOI:10.1039/p29810001121
日期:——
The kinetics of the decomposition of ten substituteddibenzylmercurycompounds in solution have been determined in the temperature range 126–156°. From the relative rates at 140.2°, a new scale of substituent constants σ˙ applicable to free radical reactions is derived. E.s.r. spectra for seven substituted benzyl radicals show a reasonable correlation of aα–CH2 with σ˙.