Temperature-dependent isomerisation versus net fragmentation of secondary allylic alcohols with Grubbs’ catalyst
摘要:
Secondary allylic alcohols with 10 mol% of Grubbs catalyst in refluxing toluene/1,2-dichloroethane undergo isomerisation to ethyl ketones whereas with 100 mol% of Grubbs catalyst at room temperature, a net fragmentation reaction with the loss of a carbon atom occurs, to provide a methyl ketone. Probable mechanisms are described. (C) 2001 Elsevier Science Ltd. All rights reserved.
A Convenient and Versatile Method for the Preparation of α-Hydroxymethyl Ketone Derivatives from the Corresponding Allyl Silyl Ethers or Allyl Carboxylates
作者:Yung-Son Hon、Ying-Chieh Wong、Kuo-Jui Wu
DOI:10.1002/jccs.200800134
日期:2008.8
The ozonolysis of 1-substituted allyl silyl ethers or 1-substituted allyl carboxylates followed by treatment with bases gave the corresponding α-silyloxymethyl- or a-acyloxymethyl-ketones in good yields. It is proposed to proceed via the corresponding α-silyloxy- or α-acyloxyaldehydes intermediates followed by 1,4-group migration. The results of theoretical calculations are applicable to explain the
Colonge; David, Bulletin de la Societe Chimique de France, 1959, p. 1248
作者:Colonge、David
DOI:——
日期:——
US6200254B1
申请人:——
公开号:US6200254B1
公开(公告)日:2001-03-13
Temperature-dependent isomerisation versus net fragmentation of secondary allylic alcohols with Grubbs’ catalyst
作者:Mukund K Gurjar、Pedduri Yakambram
DOI:10.1016/s0040-4039(01)00449-x
日期:2001.5
Secondary allylic alcohols with 10 mol% of Grubbs catalyst in refluxing toluene/1,2-dichloroethane undergo isomerisation to ethyl ketones whereas with 100 mol% of Grubbs catalyst at room temperature, a net fragmentation reaction with the loss of a carbon atom occurs, to provide a methyl ketone. Probable mechanisms are described. (C) 2001 Elsevier Science Ltd. All rights reserved.
Macrocyclic ketones as fragrance materials and methods for making same
申请人:Takasago International Corporation
公开号:US06200254B1
公开(公告)日:2001-03-13
Novel macrocyclic diene ketone compounds useful as fragrance materials are described having the following general formula (I):
where R1, R2, R3 and R4 are each either a hydrogen atom or a C1 to C4 alkyl, a is the integer 1 or 2 and b is an integer in a range from 1 to 6. Novel pathways are described for synthesizing these macrocyclic diene ketones, as well as saturated and mono-unsaturated macrocyclic ketones having the following general formula (IV):
where R1, R2, R3 and R4 are each independently a hydrogen atom or a C1 to C4 alkyl, a is the integer 1 or 2 and b is an integer in a range from 1 to 6.