Cationic Platinum-Catalyzed Etherification by Intra- and Intermolecular Dehydration of Alcohols
作者:Takanori Shibata、Ryo Fujiwara、Yasunori Ueno
DOI:10.1055/s-2004-835664
日期:——
Catalytic etherification of diols proceeds to give various cyclic ethers by use of cationic platinum salt, which is in situ prepared from PtCl2 and AgSbF6. Etherification of benzylic alcohols is also possible by intermolecular dehydration. Both of intra- and intermolecular etherifications smoothly proceed even under an atmosphere of air.
with readily prepared cobalt or titanium nanoparticles, under mild reaction conditions, led to the obtention of different reductive dimerization products depending on the nature of the transition metal used. Cobalt nanoparticles (CoNPs) allowed the selective transformation of the starting carbonylcompounds into vicinal diols, whereas the reaction promoted by titanium nanoparticles (TiNPs) led to the
Selective Mono Addition of Aryllithiums to Dialdehydes by Micromixing
作者:Aiichiro Nagaki、Hiroki Yamashita、Yusuke Takahashi、Satoshi Ishiuchi、Keita Imai、Jun-ichi Yoshida
DOI:10.1246/cl.170899
日期:2018.1.5
Micromixing enables highly selective mono addition of aryllithiums to dialdehydes. Because the unchanged formyl group in the products can be used for further transformations, the present approach serves as a powerful method for protecting-group-free synthesis.
Chiral monoaminoalcohols and diaminoalcohols of squaric acid: new catalysts for the asymmetric reduction of ketones by borane
作者:Haibing Zhou、Shoumao Lü、Rugang Xie、Albert S.C Chan、Teng-Kuei Yang
DOI:10.1016/s0040-4039(00)02162-6
日期:2001.2
Two series of newchiral ligands, squaric acid aminoalcohols and C2-symmetric squaric acid diaminoalcohols have been synthesized. The chiral oxazaborolidines formed in situ from these ligands have been used in the enantioselective borane reduction of prochiral ketones and diketones to afford alcohol products with up to 99% enantiomeric excesses. The structures of the ligands have an obvious effect
Synthetic esters derived from high stability oleic acid
申请人:QUAKER CHEMICAL CORPORATION
公开号:US11155761B2
公开(公告)日:2021-10-26
A composition comprising a synthetic ester having a fatty acid mixture including: oleic acid in amount of at least about 85 wt % of the fatty acid mixture; linoleic acid in an amount of about 3 wt % of the fatty acid mixture or less; and linolenic acid in an amount of about 0.5 wt % of the fatty acid mixture or less.