Heterogeneous Hydroxyl-Directed Hydrogenation: Control of Diastereoselectivity through Bimetallic Surface Composition
作者:Alexander J. Shumski、William A. Swann、Nicole J. Escorcia、Christina W. Li
DOI:10.1021/acscatal.1c01434
日期:2021.5.21
surface. In this work, we demonstrate that Pd–Cu bimetallic nanoparticles with both Pd and Cu atoms distributed across the surface are capable of high conversion and diastereoselectivity in the hydroxyl-directed hydrogenation reaction of terpinen-4-ol. We postulate that the OH directing group adsorbs to the more oxophilic Cu atom while the olefin and hydrogen bind to adjacent Pd atoms, thus enabling selective
Enantioselectivity in the Biotransformation of Mono- and Bicyclic Monoterpenoids with the Cultured Cells of<i>Nicotiana tabacum</i>
作者:Hiroki Hamada
DOI:10.1246/bcsj.61.869
日期:1988.3
The biotransformation of the enantiomeric pairs of p-menthane and bicyclo[2.2.1] and [3.1.1]heptane derivatives with the culturedcells of Nicotianatabacum was investigated. It was found that (i) the culturedcells discriminate the enantiomers of p-menthan-2-ol and bicyclo[2.2.1]heptan-2-ol and bicyclo[3.1.1]heptan-3-ol derivatives, and enantioselectively convert these alcohols to the corresponding
Synthesis of a key intermediate for the total synthesis of pseudopteroxazole
作者:J.S. Yadav、E. Vijaya Bhasker、P. Srihari
DOI:10.1016/j.tet.2010.01.054
日期:2010.3
A facile synthesis of a key intermediate for the totalsynthesis of anti-mycobacterial compound pseudopteroxazole is described employing an intramolecular Diels–Alder cyclization and an iodine-mediated oxidative aromatization step.
Stereochemistry-Activity Relationships in Olfaction. Odorants containing a proton donor/proton acceptor unit
作者:G�nther Ohloff、Wolfgang Giersch
DOI:10.1002/hlca.19800630109
日期:1980.1.23
A novel class of odorants is described where the odor is associated with the interaction of two functional groups, one being an H-donor (AH function), and the other an H-acceptor (B function). Generally, odor occurs only if the distance between the two structural elements (AH/B system) is less than 3 Å. Bifunctional derivatives of the p-menthane and iridane series served as models for deriving this
Structure–Odor Activity Studies on Monoterpenoid Mercaptans Synthesized by Changing the Structural Motifs of the Key Food Odorant 1-<i>p</i>-Menthene-8-thiol
作者:Sebastian Schoenauer、Peter Schieberle
DOI:10.1021/acs.jafc.6b01645
日期:2016.5.18
ring always resulted in higher odor thresholds compared to thiols with a mercapto group in the side chains. Although all tertiary thiols always exhibited low odor thresholds, none of the 31 compounds reached the extremely low threshold of 1. Also, none of the synthesized mercapto monoterpenoids showed a similar odor quality resembling grapefruit. Although the saturated and aromatic analogues exhibited
1- p-甲基-Nenthene-8-硫醇(1)几十年前被发现是柚子汁中的主要气味物质,它对水果的整体气味有贡献,在空气中的气味阈值极低,仅为0.000034 ng / L。该值是有史以来针对食品气味剂报告的最低气味阈值之一。为了检查结构1的修饰是否会导致气味阈值和气味质量的变化,使用了34个含巯基的对薄荷烷和1- p合成了薄荷烯衍生物以及几种芳族和开链巯基单萜。文献中首次报道了其中的18种,并提供了它们的气味阈值和气味质量以及分析数据。感官数据与1的感官数据比较表明,双键的氢化导致气味阈值明显增加。此外,与在侧链中具有巯基的硫醇相比,将巯基移入环中总是导致较高的气味阈值。尽管所有叔硫醇始终表现出较低的气味阈值,但31种化合物均未达到极低的阈值1。同样,没有合成的巯基单萜类化合物具有类似于葡萄柚的类似气味质量。尽管饱和和芳香族类似物的香气与1类似,但大多数其他化合物的香气被描述为含硫,橡胶