Cleavages of ethers by chlorotrimethylsilane and acetic anhydride
作者:J C Sarma、M Borbaruah、D N Sarma、N C Barua、R P Sharma
DOI:10.1016/s0040-4020(01)87555-4
日期:1986.1
benzyl ethers have been cleaved with a combination of reagents consisting of chlorotrimethylsilane and acetic anhydride containing a catalytic amount of concentrated sulfuric acid. Methylthiomethyl ethers yield the corresponding acetoxymethyl ethers with chlorotrimethylsilane and acetic anhydride. Comparative study with the borontrifluoride etherate and acetic anhydride method of ethercleavage suggests
甲基和苄基醚已用由三甲基氯硅烷和乙酸酐组成的试剂组合裂解,其中含有催化量的浓硫酸。甲硫基甲基醚与氯代三甲基硅烷和乙酸酐产生相应的乙酰氧基甲基醚。与三氟化硼醚化物和乙酸酐方法进行醚裂解的比较研究表明,氯三甲基硅烷和乙酸酐(在H 2 SO 4催化下)可能是一种有用的替代方法。
Zirconium oxychloride hydrate: an efficient and reusable catalyst for retro-Claisen condensation of alcohols with 1,3-diketones
synthesized via the condensation of alcohols with acids. Herein, we report zirconium oxychloride hydrate as an efficient and reusable catalyst for the synthesis of esters from alcohols and 1,3-diketones. The reaction tolerates a wide range of alcohols, including primary and secondaryalcohols, electron-rich and electron-deficient alcohols, and various natural alcohols. This methodology provides an alternative
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