Chemoselective Preparation of Oximes, Semicarbazones, and Tosylhydrazoneswithout Catalyst and Solvent
摘要:
A simple and versatile method for the synthesis of oximes, semicarbazones, and tosylhydrazones of aldehydes in the presence of ketones without catalyst and solvent is presented.
SULFURATED BOROHYDRIDE EXCHANGE RESIN: A NOVEL REAGENT FOR SELECTIVE REDUCTION OF ALDEHYDES
作者:B. P. Bandgar、V. T. Kamble
DOI:10.1081/scc-100105677
日期:2001.1
Selectivereduction of aldehydes is carried out by using sulfurated borohydride exchange resin as a novel reducing reagent. Other sensitive groups like F, Cl, Br, NO2, CN, OMe, ester and methylenedioxy remain intact under these reaction conditions. The isolation of pure products by simple filtration and evaporation is an important feature of this method.
developed for effective Friedel–Craft’s acylation of aromaticcompounds. Acylation of aromaticcompounds with acetamide/SO2Cl2 was much more effective and faster than analogous (acetamide/SOCl2) and (acetamide/POCl3) reagents even under conventional conditions. However, microwave and ultrasonic assisted reactions afforded high yields of products in very short reaction times (30–40 min under sonication and 3–4 min
已开发出乙酰胺/ SO 2 Cl 2试剂,用于有效地进行Friedel-Craft芳族化合物的酰化反应。即使在常规条件下,与类似的(乙酰胺/ SOCl 2)和(乙酰胺/ POCl 3)试剂相比,用乙酰胺/ SO 2 Cl 2酰化芳族化合物也更有效和更快。但是,微波和超声辅助反应可在非常短的反应时间内(在超声处理下30–40分钟,在微波辅助条件下3-4分钟)提供高产率的产品。
Selective Fries Rearrangement Catalyzed by Zinc Powder
作者:Satya Paul、Monika Gupta
DOI:10.1055/s-2004-829152
日期:——
Zinc powder in the presence of N,N-dimethylformamide efficiently catalyzes the selective Fries rearrangement of acetylated phenols under microwave heating or with conventional heating using an oil bath. In some cases different products were obtained using microwave heating and conventional heating. Selective migration of the acyl group has been noted with good yields.
Chemoselective Preparation of Oximes, Semicarbazones, and Tosylhydrazoneswithout Catalyst and Solvent
作者:Babasaheb P. Bandgar、Vaibhav S. Sadavarte、Lav S. Uppalla、Rahul Govande
DOI:10.1007/s007060170126
日期:2001.3.15
A simple and versatile method for the synthesis of oximes, semicarbazones, and tosylhydrazones of aldehydes in the presence of ketones without catalyst and solvent is presented.