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翻訳と辞書　辞書検索 [ 開発暫定版 ] スポンサード リンク Oxidation with chromium(VI)-amine complexes ： ウィキペディア英語版 Oxidation with chromium(VI)-amine complexes Oxidation with chromium(VI)-amine complexes involves the conversion of alcohols to carbonyl compounds or more highly oxidized products through the action of chromium(VI) oxide-amine adducts and salts. Representative members of this family of reagents include Collins reagent, pyridinium chlorochromate (PCC), and pyridinium dichromate (PDC).〔Luzzio, F. A. ''Org. React.'' 1998, ''53'', 1. 〕 ==Introduction== Sarrett identified the adduct of pyridine and chromium(VI) oxide (Collins reagent) as a selective compound for the oxidation of primary and secondary alcohols to carbonyl compounds.〔Poos, G. I.; Arth, G. E.; Beyler, R. E.; Sarrett, L. H. ''J. Am. Chem. Soc.'', 1953, ''75'', 422.〕 Despite its selectivity, Collins reagent suffers from difficulties associated with its preparation, stability, and efficiency. The less reactive adducts pyridinium chlorochromate (PCC) and pyridinium dichromate (PDC) are more easily handled and more selective than Collins reagent in oxidations of alcohols. These reagents, as well as other, more exotic adducts of nitrogen heterocycles with chromium(VI), facilitate a number of oxidative transformations of organic compounds, including cyclization to form tetrahydrofuran derivatives and allylic transposition to afford enones from allylic alcohols. Oxidation with chromium(VI) amines has two primary limitations. Operationally, the tarry byproducts of chromium oxidations cause reduced yields and product sequestration.〔Ratcliffe, R.; Rodehorst, R. ''J. Org. Chem.'', 1970, ''35'', 4000.〕 In addition, Cr(VI)-amines (particularly PCC) may react with acid-labile functionality. Thus, these agents have been employed in oxidations of relatively simple substrates, often in excess to account for reagent trapping and decomposition. The use of adsorbents such as Celite or silica gel facilitates the removal of chromium byproducts and eliminates many of the operational difficulties associated with chromium-mediated oxidations. ''(1)''File:ChroGen.png 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「Oxidation with chromium(VI)-amine complexes」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.