The present invention provides an activator in arylamination using a palladium compound as a catalyst, which is superior to conventional phosphines in stability and performance. With the phosphine sulfide as an activator, an arylamination reaction achieves improved selectivity to produce a desired aromatic amine in an obviously increased yield as compared with a reaction using the corresponding phosphine compound. Moreover, the phosphine sulfide of the invention is impervious to oxidation and exists stably in air and therefore sufficiently withstands use on an industrial scale.
Phenols were vinylated at the ortho-position with ethyne in the presence of SnCl(4)-Bu(3)N reagent. The reaction was applicable to phenols possessing either electron-donating or electron-withdrawing groups. 2,6-Divinylphenols were synthesized under modified conditions. A reaction mechanism involving carbostannylation of alkynyltin and phenoxytin was discussed.
REACTION CATALYST FOR CROSS-COUPLING AND METHOD FOR MANUFACTURING AROMATIC COMPOUND
申请人:HOKKO CHEMICAL INDUSTRY CO., LTD.
公开号:US20150360214A1
公开(公告)日:2015-12-17
The object of the present invention is to provide a new organic phosphorus ligand that can efficiently promote cross-coupling reaction to obtain the target substance at high yield, as well as a method of manufacturing such ligand whose steric characteristics and electronic characteristics can be fine-tuned and which can be used to cause cross-coupling reaction at high yield. As a means for achieving the aforementioned object, a phosphine compound expressed by General Formula (1) below is provided.
(In the formula, R
1
and R
2
are each independently a secondary alkyl group, tertiary alkyl group, or cycloalkyl group, while R
3
and R
4
are each independently a hydrogen, aliphatic group, heteroaliphatic group, aromatic group, alicyclic group, or heterocyclic group. Note that R
3
and R
4
have no phosphorus atom and that R
3
and R
4
are not both hydrogen at the same time).
Catalytic chemo and homoselective ipso-nitration under mild condition
作者:Hassan Sepehrmansourie、Mahmoud Zarei、Mohammad Ali Zolfigol、Sima Kalhor、Hu Shi
DOI:10.1016/j.mcat.2022.112634
日期:2022.10
The described method provides a beneficial and convenient strategy for chemo and homoselective ipso-nitration reaction. In contrast to the previously reported methodologies, acid nitric (HNO3) was not used in the course of the nitration reaction. The presented method was applied for the ipso-nitration of a broad range of compounds (47 samples) under mild conditions.