A visible-light-photocatalytic water-splitting strategy for sustainable hydrogenation/deuteration of aryl chlorides
作者:Xiang Ling、Yangsen Xu、Shaoping Wu、Mofan Liu、Peng Yang、Chuntian Qiu、Guoqiang Zhang、Hongwei Zhou、Chenliang Su
DOI:10.1007/s11426-019-9672-8
日期:2020.3
chlorides instead of using flammable H2. When applying heavy water-splitting systems, we could selectively install deuterium at the C−Cl position of aryl chlorides under mild conditions for the sustainable synthesis of high-valued added deuterated chemicals. Sub-micrometer Pd nanosheets (Pd NSs) decorated crystallined polymeric carbon nitrides (CPCN) is developed as the bifunctional photocatalyst,
A Path to More Sustainable Catalysis: The Critical Role of LiBr in Avoiding Catalyst Death and its Impact on Cross‐Coupling
作者:Philip Eckert、Michael G. Organ
DOI:10.1002/chem.202000288
日期:2020.4.9
The role that LiBr plays in the lifetime of Pd‐NHC complexes has been investigated. A bromide ion is proposed to coordinate to Pd thereby preventing beta hydride elimination (BHE) (to form NHC‐H+) of the reductive elimination (RE) intermediate that normally completes with the desired cross‐coupling catalytic cycle. Coordinating groups, such as anilines, are able to bind suitably well to Pd to prevent
A rhodium-catalyzed Suzuki-Miyaura couplingreaction via C(O)-C bond activation to form 2-benzoylpyridine N-oxide derivatives is reported. Both the C(O)-C(sp2) and C(O)-C(sp3) bond could be activated during the reaction with yields up to 92%. The N-oxide moiety could be employed as a traceless directing group, leading to free pyridine ketones.
A rhodium-catalyzed transarylation of benzamides via selective C–Cbond activation with arylboronic acids was described, which was distinct from the conventional metal-catalyzed C–N bond activation. This transformation exhibited good functional group compatibility with yields up to 88%, offering a practical approach for the construction and functionalization of benzamides. Preliminary experimental