Conversion of α acetylenic alcohols into αβ unsaturated aldehydes
作者:Marc Julia、Christian Lefebvre
DOI:10.1016/s0040-4039(00)99836-8
日期:1984.1
Very mild conditions have been found for the efficient regioselective addition of phenylthiol to ethynyl carbinols. A biphasic aqueous acid hydrolysis then leads to α,β-unsaturated aldehydes. The Meyer-Schuster rearrangement is thus brought about in two steps.
The Rearrangement of ?-Acetylenic Alcohols to ?, ?-Unsaturated Carbonyl Compounds by Silylvanadate Catalysts
作者:Horst Pauling、David Arthur Andrews、Nathan Chadwick Hindley
DOI:10.1002/hlca.19760590426
日期:1976.6.2
New catalytic systems have been found which effect the isomerization of α-acetylenic alcohols to the corresponding α, β-unsaturated carbonylcompounds with high efficiency. These are combinations of silylvanadates with silanols or silanediols.
Asymmetricα,γ-regioselective [3 + 3] formal cycloadditions of α,β-unsaturatedaldehydes and 2-nitroallylic acetates have been developed for the first time. These reactions proceeded through a domino Michael addition–Michael addition sequence via an unusual cascade dienamine–dienamine catalysis of a chiral secondary amine, and multifunctional cyclohexene derivatives were generally constructed in moderate
首次开发了α,β-不饱和醛与2-硝基烯丙基乙酸酯的不对称α,γ-区域选择性[3 + 3]形式环加成。这些反应通过手性仲胺的不同寻常的级联二烯胺-二烯胺催化,通过多米诺骨牌迈克尔加成-迈克尔加成序列进行,在简单地用K 2 CO 3处理后,通常以中等收率构建具有优良立体选择性的多功能环己烯衍生物。
Structure–Odor Correlations in Homologous Series of Mercaptoalkanols
作者:Johannes Polster、Peter Schieberle
DOI:10.1021/acs.jafc.7b01266
日期:2017.5.31
synthesized. Odorthresholds in air and odor qualities were determined, and the results obtained were correlated to the chemical structures. Sensory properties were strongly influenced by steric effects: All homologous series revealed a minimum in odorthresholds between five and seven carbon atoms, and increasing the length of the carbon chain led to an exponential increase in odorthresholds. The olfactory