[EN] NOVEL 1,2-DIPHENYLETHYLENE GLYCOL COMPOUNDS FOR COMBATING AGING OF THE SKIN, AND COSMETIC USE THEREOF [FR] NOUVEAUX COMPOSÉS 1,2-DIPHÉNYLÉTHYLÈNE GLYCOL POUR LUTTER CONTRE LE VIEILLISSEMENT DE LA PEAU, ET LEUR UTILISATION EN COSMÉTIQUE
pinacol-type couplings between two structurally similar aromatic aldehydes promoted by low-valenttitanium generated unsymmetrical pinacols in moderate to good isolated yields in an erythro/threo ratio of up to 91:9. This synthetic methodology significantly extends the scope of the cross pinacol-type couplings. pinacol - pinacol-type coupling - cross coupling - McMurry coupling - low-valenttitanium
Selectivity Control in Photocatalytic Valorization of Biomass-Derived Platform Compounds by Surface Engineering of Titanium Oxide
作者:Xuejiao Wu、Jieqiong Li、Shunji Xie、Pengbo Duan、Haikun Zhang、Jun Feng、Qinghong Zhang、Jun Cheng、Ye Wang
DOI:10.1016/j.chempr.2020.08.014
日期:2020.11
titanium oxide has been widely used for photocatalytic pollutant degradation, H2 evolution, and CO2 reduction, few studies have been devoted to TiO2-based photocatalytic valorization of biomass or biomass-derived platform compounds. Here, we report on surface-controlled photocatalysis of TiO2 for selective valorization of furfurals and vanillin that are lignocellulose-derived key platform compounds. The
The invention concerns delayed release flavourant compositions.
In particular, these compositions are selected from the group consisting of
a) smoking compositions and
b) foodstuffs, in particular
b1) bakeable foodstuffs and
b2) microwaveable foodstuffs
containing flavour-release additives, namely 1,2―diols of the formula
wherein R1 is one of the radicals
where
R2 isH, lower alkyl
R3, R4 areH, lower alkyl, lower alkoxy, hydroxy, or R3 + R4 together are methylenedioxy,
R5 islower alkyl
and the broken lines represent in the ring one additional bond
and in the side chain an optional bond.
Quinone dehydrogenation. Oxidation of benzylic alcohols with 2,3-dichloro-5,6-dicyanobenzoquinone
作者:Hans Dieter Becker、Anders Bjoerk、Erich Adler
DOI:10.1021/jo01297a010
日期:1980.4
PINACOL COUPLING OF AROMATIC ALDEHYDES AND KETONES USING MAGNESIUM IN AQUEOUS AMMONIUM CHLORIDE UNDER ULTRASOUND
作者:Ji-Tai Li、Yan-Jiang Bian、Hong-Jun Zang、Tong-shuang Li
DOI:10.1081/scc-120002400
日期:2002.1.1
The pinacol coupling reaction of aromatic aldehydes and ketones was performed in 8.95% yield with magnesium in 0.1 M aqueous NH4Cl under ultrasound irradiation at r.t. for 3 h.