| 翻訳と辞書 |
| Resorcinarene ： ウィキペディア英語版 |
Resorcinarene
A resorcinarene (also resorcarene or calix()resorcinarene) is a macrocycle, or a cyclic oligomer, based on the condensation of resorcinol (1,3-dihydroxybenzene) and an aldehyde. Resorcinarenes are a type of calixarene.
==Synthesis==
The resorcinarene macrocycle is typically prepared by condensation of resorcinol and an aldehyde in concentrated acid solution. Recrystallization typically gives the desired isomer in quite pure form. However, for certain aldehydes, the reaction conditions lead to significant by-products. Therefore, alternative condensation conditions have been developed, including the use of Lewis acid catalysts.
A green chemistry procedure was recently developed using solvent-free conditions: resorcinol, an aldehyde, and ''p''-toluenesulfonic acid are ground together in a mortar and pestle at low temperature. A paste-like solid forms upon sitting for several minutes, which can be washed with water and crystallized to give the desired resorcinarene.
Under each of these conditions, aromatic aldehydes react much faster, but less stereoselectively than aliphatic aldehydes, and the reaction frequently leads to a mixture of desired and undesired products.
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
■ウィキペディアで「Resorcinarene」の詳細全文を読む
スポンサード リンク
| 翻訳と辞書 : 翻訳のためのインターネットリソース |
Copyright(C) kotoba.ne.jp 1997-2016. All Rights Reserved.
|
|