Mechanism of arylation of nucleophiles by aryllead triacetates. Part 2. Support for a ligand coupling process and X-ray molecular structure of (p-methoxyphenyl)-α-methylphenacyllead (<scp>IV</scp>) diacetate
作者:Jacqueline Morgan、Irmi Buys、Trevor W. Hambley、John T. Pinhey
DOI:10.1039/p19930001677
日期:——
In the presence of boron trifluoride–diethyl ether complex p-methoxyphenyllead triacetate 4 and the propiophenone silylenolether 6 were found to undergo a rapid reaction to give (p-methoxyphenyl)-α-methylphenacyllead diacetate 9 in high yield. Analogous products, 5, 10 and 11 respectively, were formed when the silylenolethers of acetophenone, butyrophenone and isobutyrophenone were treated under
α-Arylation of ketones by aryllead triacetates. Effect of methyl and phenyl substitution at the α position
作者:Jacqueline Morgan、John T. Pinhey、Bruce A. Rowe
DOI:10.1039/a607543f
日期:——
An examination of the α-arylation of a number of
ketones and their enolate salts by p-methoxyphenyllead
triacetate provides further evidence for a very marked
selectivity in the arylation reaction. It is found that the
reaction proceeds well at tertiary α-carbons and at
secondary centres activated by the presence of a phenyl group,
but fails where the secondary centre is unactivated and at
primary α-carbons.
PROCESS FOR PREPARING KETONES FROM ALPHA-OXO CARBOXYLATES AND ARYL BROMIDES
申请人:Cotte Alain
公开号:US20090221832A1
公开(公告)日:2009-09-03
A process for preparing ketones of the general formula (III)
where
R is an optionally substituted carbocyclic aromatic radical having 6 to 24 carbon atoms or an optionally substituted alkyl radical or an optionally substituted heteroaromatic radical having 5 to 24 carbon atoms, and
R
1
is an optionally substituted carbocyclic aromatic radical having 6 to 24 carbon atoms or an optionally substituted heteroaromatic radical having 5 to 24 carbon atoms,
by reacting alpha-oxo carboxylates of the general formula (I)
wherein
n and m is a number in the range from 1 to 6,
M
(m+)
is a cation, and
R has the meaning indicated for formula (III),
with aryl bromides of the general formula (II)
R
1
—Br (II)
where
R
1
has the meaning indicated for formula (III),
in the presence of two transition metals or compounds thereof as catalyst, is described.
Decarboxylative 1,2-rearrangement of cyclic carbonates promoted by Lewis acid
作者:Yoichi Dokai、Kodai Saito、Tohru Yamada
DOI:10.1039/d2cc03024a
日期:——
A Lewis acid-mediated decarboxylative 1,2-rearrangement reaction of cyclic carbonates was developed. The selectivity of the migration of cyclic carbonates was opposite to that of the corresponding 1,2-diols under the same reaction conditions.