Carotenoids and related compounds. Part XVI. Structural and synthetic studies on spirilloxanthin, chloroxanthin, spheroidene, and spheroidenone
作者:M. S. Barber、L. M. Jackman、P. S. Manchand、B. C. L. Weedon
DOI:10.1039/j39660002166
日期:——
The structure of spirilloxanthin (rhodoviolascin) was unambiguously determined by degradative and nuclear magnetic resonance spectral studies. Similar studies indicated the structures of chloroxanthin, spheroidene (“Pigment Y”), and spheroidenone (“Pigment R”); these structures have been confirmed by total syntheses.
Alternative Synthesis of the Colorado Potato Beetle Pheromone
作者:Juan A. Faraldos、Robert M. Coates、José-Luis Giner
DOI:10.1021/jo4017056
日期:2013.10.18
involves a 6-endo epoxide ring-opening with ester participation that simultaneously inverts the 3R-configuration of the (3R)-2,3-epoxy-2-fluoroprenyl acetate intermediate and installs the ketone functionality of the semiochemical. Extensive NMR studies validate the proposed 6-endo mechanism of the featured rearrangement, which under anhydrous conditions resulted in the formation of two bicyclic 1,3-dioxan-5-ones
雄性科罗拉多马铃薯甲虫分泌的信息素的简明制剂[即。(3 S )-1,3-二羟基-3,7-二甲基-6-辛烯-2-one]从2-氟橙花醇或2-氟香叶醇开始,分四步完成。合成中的关键步骤涉及酯参与的 6-内环氧化物开环,同时反转(3 R )-2,3-环氧-2-氟异戊二烯乙酸酯中间体的 3 R-构型并安装符号化学。广泛的 NMR 研究验证了所提出的特征重排的 6-endo 机制,该机制在无水条件下通过前所未有的分子内 Prins 环化形成两个双环 1,3-二恶烷-5-酮。
[EN] PERFUME SYSTEMS<br/>[FR] SYSTÈMES DE PARFUM
申请人:PROCTER & GAMBLE
公开号:WO2015148743A1
公开(公告)日:2015-10-01
The present application relates to perfume raw materials, perfume delivery systems and consumer products comprising such perfume raw materials and/or such perfume delivery systems, as well as processes for making and using such perfume raw materials, perfume delivery systems and consumer products. Such perfume raw materials and compositions, including the delivery systems, disclosed herein expand the perfume communities' options as such perfume raw materials can provide variations on character and such compositions can provide desired odor profiles.
Stereoselective total synthesis of (±)-obscuronatin, a marine diterpene with a 10-membered ring, has been achieved utilizing the anion-induced cyclization of an acyclic epoxy sulfide. The synthesis confirmed the stereostructure of the natural product.
Selective Wacker-type oxidation of long-chain terminal alkenes to methylketones was successfully achieved by using Pd(OAC)(2)/molybdovanadophosphate (NPMoV)/O-2 system. The selectivity of the reaction increased by slow addition of the alkenes to the catalytic solution. The oxidation of alpha,omega-dienes was also examined, and the selectivity of the oxidation was found to depend on the chain length of the dienes used. (C) 2002 Elsevier Science Ltd. All rights reserved.