Synthesis of 1,4-dihydropyridine derivatives having an oxy-, alkoxy-, or dimethylaminophenyl substituent in the 4 position, their antioxidant activity, and their binding to phospholipid membranes
开发了溴化物催化的醇的氧化反应,该氧化反应在碱金属溴化物和氧化剂的存在下于温和的条件下进行。该反应涉及使用KBr和Oxone进行无有机分子的氧化,以及使用KBr和H 2 O 2水溶液进行布朗斯台德酸辅助氧化,以高收率提供各种羰基化合物。而且,在TEMPO存在下,在两种反应条件下,溴化物催化的伯醇的氧化使得羧酸和醛的发散合成成为可能。在各种机理研究的基础上,提出了一种可能的催化机理。
Slow release of fragrant compounds in perfumery using alpha-keto esters
申请人:FIRMENICH SA
公开号:US20010014661A1
公开(公告)日:2001-08-16
The present invention describes a fragrance delivery system which releases fragrant aldehydes or ketones and/or fragrant compounds containing an olefin function upon exposure to light. This system comprises &agr;-keto esters of formula
1
in which R′* and R″* have the meaning as defined in the application and which are generally, in case of R′*, an alkyl group carrying an abstractable hydrogen in &ggr;-position relative to the &agr;-keto function and carrying a moiety from which is derived a fragrant compound containing an olefin function, and, in case of R″*, the organic part of a primary or secondary alcohol from R″*OH which is derived a fragrant aldehyde or ketone.