METHODS OF PREPARING a,ß-UNSATURATED OR a-HALO KETONES AND ALDEHYDES
申请人:International Flavors & Fragrances Inc.
公开号:US20170174607A1
公开(公告)日:2017-06-22
Copper(II) bromide mediated oxidation of acylated enol and use of the reaction in the synthesis of α,β-unsaturated or α-bromo ketones or aldehydes are disclosed. The method provides an efficient and practical process for manufacturing dehydrohedione (DHH) and many other versatile α,β-unsaturated or α-bromo ketones or aldehydes in large scales to avoid using precious metal compounds.
The ene reaction of singlet oxygen: kinetic and product evidence in support of a perepoxide intermediate
作者:John R. Hurst、Stephen L. Wilson、Gary B. Schuster
DOI:10.1016/s0040-4020(01)96592-5
日期:1985.1
The ene reaction of singletoxygen (1O2) was examined using time-resolved techniques and by an intramolecular trapping reaction. The Eyring activation parameters reveal that the rate of the ene reaction of 1O2 with simple olefins is controlled by ΔS‡. A description of the reaction co-ordinate accommodating our findings and the results of others is presented.
使用时间分辨技术和分子内俘获反应检查了单线态氧(1 O 2)的烯反应。Eyring活化参数表明1 O 2与简单烯烃的烯反应速率受ΔS ‡控制。介绍了反应坐标以适应我们的发现和其他结果的描述。
METHODS OF PREPARING ALPHA,BETA-UNSATURATED OR ALPHA-HALO KETONES AND ALDEHYDES
申请人:International Flavors & Fragrances Inc.
公开号:EP3184504A1
公开(公告)日:2017-06-28
Copper(II) bromide mediated oxidation of acylated enol and use of the reaction in the synthesis of α,β-unsaturated or α-bromo ketones or aldehydes are disclosed. The method provides an efficient and practical process for manufacturing dehydrohedione (DHH) and many other versatile α,β-unsaturated or α-bromo ketones or aldehydes in large scales to avoid using precious metal compounds.
Thermal Decomposition of Pentacarbonyl(1-acyloxyalkylidene)chromium(0) Complexes: Formation of <i>Z</i>-Enol Esters
作者:Björn C. Söderberg、Jian Liu、Thomas W. Ball、Michael J. Turbeville
DOI:10.1021/jo962197c
日期:1997.8.1
Pentacarbonyl(1-acyloxyalkylidene)chromium(0) complexes, formed in situ by reaction of the corresponding tetramethylammonium pentacarbonyl(1-oxoalkyl)chromate(1-) salts with carboxylic acid halides, affords enol esters in moderate to good yields. In all cases examined, the Z-enol ester was obtained as the major or exclusive isomer. Addition of I equiv of pyridine to the reaction mixture substantially improved the Z/E ratio and, in most cases, increased the chemical yield.
145. The Erlenmeyer reaction with aliphatic aldehydes, 2-phenyloxazol-5-one being used instead of hippuric acid