Organocatalytic head-to-tail dimerization of methacrolein via conjugate addition of methanol: an alcohol activation mechanism proved by electrospray ionization mass spectrometry
conjugate addition of methanol is catalyzed by various organicbases, such as an amine, phosphine, and N-heterocyclic carbene, to give 2,4-dimethyl-2-methoxymethylpentane-1,5-dial in moderate yields. Based on the interpretation of the key intermediates by electrospray ionization mass spectrometry, we propose a reaction mechanism involving the initial conjugate addition of the organicbases to methacrolein
The invention relates to a selection of succinic acid imides that have, in the 2-position, alkoxy, alkoxyalkyl or acyloxy substituents having up to 4 carbon atoms and the imine components of which are derived from aliphatic amines having up to 5 carbon atoms or from aniline optionally having up to 2 substituents. The succinic acid imides according to the invention are used as fungicides. A method for their manufacture is also disclosed.
An experimental investigation into the kinetics and mechanism of the aza-Michael additions of dimethyl itaconate
作者:Daniel M. Day、Thomas J. Farmer、James Sherwood、James H. Clark
DOI:10.1016/j.tet.2022.132921
日期:2022.8
compounds with amines. The reactivity of dimethyl itaconate as a bio-based Michael acceptor is explored in this work. Through its reactions with piperidine and dibutylamine, it was found that the order of reaction can be changed by the choice of catalyst, solvent, or the concentration of the amine reactant. The effectiveness of catalysts was proportional to their Lewisacidity. Competitive isomerisation
Hydroprocessing Catalyst, Preparation Method Thereof and Use of Same
申请人:Cholley Thierry
公开号:US20080194892A1
公开(公告)日:2008-08-14
The invention relates to a hydrocarbon hydroprocessing catalyst comprising a support based on at least one refractory oxide, at least one metal from group VIII and at least one metal from group VIB. The inventive catalyst is characterised in that it also comprises at least one organic compound having formula (I) or (II) in which each R
1
represents independently an alkyl group at C
1-18
, an alkenyl group at C
2-18
, an aryl group at C
6-18
, a cycloalkyl group at C
3-8
, an alkylaryl or arylalkyl group at C
7-20
, or the two R
1
groups together form a divalent group at C
2-18
, and R
2
represents an alkylene group at C
1-18
, an arylene group at C
6-18
, a cycloalkylene group at C
3-7
, or a combination of same. The invention also relates to a method of preparing one such catalyst and to the use thereof for hydroprocessing or hydrocracking.
HYDROPROCESSING CATALYST, PREPARATION METHOD THEREOF AND USE OF SAME
申请人:TOTAL MARKETING SERVICES
公开号:US20160008799A1
公开(公告)日:2016-01-14
The invention relates to a hydrocarbon hydroprocessing catalyst comprising a support based on at least one refractory oxide, at least one metal from group VIII and at least one metal from group VIB. The inventive catalyst is characterized in that it also comprises at least one organic compound having formula (I) or (II):
in which each R
1
represents independently an alkyl group at C
1-18
, an alkenyl group at C
2-18
, an aryl group at C
6-18
, a cycloalkyl group at C
3-8
, an alkylaryl or arylalkyl group at C
7-20
, or the two R
1
groups together form a divalent group at C
2-18
, and R
2
represents an alkylene group at C
1-18
, an arylene group at C
6-18
, a cycloalkylene group at C
3-7
, or a combination of same. The invention also relates to a method of preparing one such catalyst and to the use thereof for hydroprocessing or hydrocracking.