Generation of chromioenamines by reduction of O-acetyloximes with chromium(ii) and their application
作者:Kazuhiko Takai、Noriko Katsura、Yuji Kunisada
DOI:10.1039/b105357b
日期:——
Chromioenamines can be generated by treatment of O-acetyloximes with chromium(II) via two steps of one-electron reduction and successive isomerization, and the species react with aldehydes to give gamma-amino alcohols after reduction with LiAlH4.
A Practical Electrophilic Nitrogen Source for the Synthesis of Chiral Primary Amines by Copper-Catalyzed Hydroamination
作者:Sheng Guo、Jeffrey C. Yang、Stephen L. Buchwald
DOI:10.1021/jacs.8b10564
日期:2018.11.21
and practical method for the catalytic installation of the amino group across alkenes and alkynes has long been recognized as a significant challenge in synthetic chemistry. As the direct hydroamination of olefins using ammonia requires harsh conditions, the development of suitable electrophilic aminating reagents for formal hydroamination methods is of importance. Herein, we describe the use of 1
Method for the production of alkyl aryl sulphonates
申请人:——
公开号:US20040030209A1
公开(公告)日:2004-02-12
The preparation of alkylaryl compounds takes place by
1) preparation of a mixture of, on statistical average, predominantly monobranched C
10-14
-olefins by
a) reaction of a C
4
-olefin mixture over a metathesis catalyst for the preparation of an olefin mixture comprising 2-pentene and/or 3-hexene, and optional removal of 2-pentene and/or 3-hexene, followed by dimerization of the resulting 2-pentene and/or 3-hexene over a dimerization catalyst to give a mixture comprising C
10-12
-olefins, and optionally removal of the C
10-12
-olefins, or
b) extraction of predominantly monobranched paraffins from kerosene cuts and subsequent dehydrogenation, or
c) Fischer-Tropsch synthesis of olefins or paraffins, where the paraffins are dehydrogenated, or
d) dimerization of shorter-chain internal olefins, or
e) isomerization of linear olefins or paraffins, where the isomerized paraffins are dehydrogenated,
2) reaction of the olefin mixture obtained in stage 1) with an aromatic hydrocarbon in the presence of an alkylation catalyst which contains zeolites of the faujasite type.
We describe a facile synthesis of carboxylic acid oxime esters in acetonitrile from the corresponding carboxylic acids and oximes catalyzed by 2-(1H-benzotriazole-1-yl)-1,1,3,3-tetramethyluronium tetrafluoroborate in the presence of triethylamine at room temperature under mild conditions.