Synthetic and Mechanistic Aspects of Acid-Catalyzed Disproportionation of Dialkyl Diarylmethyl Ethers: A Combined Experimental and Theoretical Study
作者:Margherita Barbero、Stefano Bazzi、Silvano Cadamuro、Stefano Dughera、Giovanni Ghigo
DOI:10.1002/ejoc.200900444
日期:2009.9
The disproportionation reactions of various dialkyl diarylmethyl ethers have been carried out in the presence of a catalytic amount (10 mol-%) of o-benzenedisulfonimide as a Bronsted acid catalyst; the reaction conditions were mild, and the yields of the diarylmethane target products were good. The catalyst was easily recovered and purified, ready to be used in further reactions. The theoretical study
各种二烷基二芳基甲基醚的歧化反应是在催化量(10 mol%)的邻苯二磺酰亚胺作为布朗斯台德酸催化剂存在下进行的;反应条件温和,二芳基甲烷目标产物收率良好。催化剂很容易回收和纯化,准备用于进一步的反应。理论研究证实该反应分两步进行:从质子化醚形成碳正离子,然后进行氢化物转移。尽管氢化物转移是决定速率的步骤,但决定反应速率和产率的是碳正离子的稳定性。(© Wiley-VCH Verlag GmbH & Co. KGaA, 69451 Weinheim, Germany, 2009)