[EN] CYCLOPROPANATION PROCESS<br/>[FR] PROCÉDÉ DE CYCLOPROPANATION
申请人:GIVAUDAN SA
公开号:WO2009023980A1
公开(公告)日:2009-02-26
A method for the preparation of cyclopropyl carbinols by cyclopropanation of unsaturated alcoholates, utilising a reagent system selected from (A) magnesium metal and dibromomethane, and (B) dibromomethane and a tertiary Grignard reagent, the reaction being carried out in the presence of an ether solvent. The process is useful, for example, for the preparation of ingredients for the flavour and fragrance industry.
Hypersensitive Radical Probe Studies of Chloroperoxidase-Catalyzed Hydroxylation Reactions
作者:Patrick H. Toy、Martin Newcomb、Lowell P. Hager
DOI:10.1021/tx9800295
日期:1998.7.1
The oxidation of hypersensitiveradicalprobes by chloroperoxidase from Caldariomyces fumago (CPO) was studied in an attempt to "time" a putative radical intermediate. Oxidation of (trans-2-phenylcyclopropyl)methane, previously studied by Zaks and Dodds [Zaks, A., and Dodds, D. R. (1995) J. Am. Chem. Soc. 115, 10419-10424] was reinvestigated. Unrearranged oxidation products were found as previously
研究了来自烟酒Caldariomyces fumago(CPO)的氯过氧化物酶对超敏自由基探针的氧化作用,以试图“计时”推定的自由基中间体。Zaks和Dodds [Zaks,A. and Dodds,DR(1995)J. Am。化学 Soc。115,10419-10424]进行了重新调查。如先前所报道,发现未重排的氧化产物,并且对照实验表明,来自环丙基羰基位置上的氧化的环醇在经受进一步氧化的同时,仍可作为可检测的物种幸存于CPO氧化中。但是,与Zaks和Dodds的报告相反,从环丙基羰基自由基中间体的开环预期的重排醇产物显示出对酶氧化反应不稳定。由于这种不稳定性,合成并测试了两种新的超敏自由基探针,即(反-2-苯基环丙基)乙烷和2-(反-2-苯基环丙基)丙烷,以及它们在环丙基羰基位置上氧化产生的潜在环状和非环状产物。CPO在环丙基羰基位置将这两个探针氧化仅得到未重排的醇产物,但对照实验再次
Cyclopropanation Process
申请人:Schroder Fridtjof
公开号:US20110124924A1
公开(公告)日:2011-05-26
A method for the preparation of cyclopropyl carbinols by cyclopropanation of unsaturated alcoholates, utilising a reagent system selected from (A) magnesium metal and dibromomethane, and (B) dibromomethane and a tertiary Grignard reagent, the reaction being carried out in the presence of an ether solvent.
The process is useful, for example, for the preparation of ingredients for the flavour and fragrance industry.