Ambient Temperature Hydrophosphination of Internal, Unactivated Alkynes and Allenyl Phosphineoxides with Phosphine Borane Complexes
摘要:
Phosphine boranes have been found to hydrophosphinate internal, unactivated alkynes at room temperature under basic conditions without the need for catalysts or radical initiators, The use of air-sensitive secondary phosphines is avoided in this facile process. Broad scope in both the phosphine borane and alkyne partners leads to excellent diversity in the phosphine products. Asymmetric hydrogenation of these species then provides one of the shortest possible routes to chiral monodentate phosphines, Hydrophosphination of allenyl phosphine oxides under similar conditions followed by hydrogenation of the exomethylene moiety yields a wide variety of bis-phosphine derivatives.
species [Bi(NAr2)3] readily release aminyl radicals [NAr2]. at ambient temperature in solution. These reactions yield the corresponding hydrazines, Ar2N−NAr2, as a result of highly selective N−N coupling. The exploitation of facile homolytic Bi−Pn bond cleavage for Pn−Pn bond formation was extended to higher homologues of the pnictogens (Pn=N–As): homoleptic bismuth amides mediate the highly selective dehydrocoupling
Homogeneous Catalytic Hydrogenation of CO
<sub>2</sub>
to Methanol – Improvements with Tailored Ligands
作者:Florian Korbinian Scharnagl、Maximilian Franz Hertrich、Gordon Neitzel、Ralf Jackstell、Matthias Beller
DOI:10.1002/adsc.201801314
日期:——
Improved molecularly‐defined cobalt catalysts for the hydrogenation of carbon dioxide to methanol have been developed. A key factor for increased productivity (up to twofold compared to previous state‐of‐the‐art‐system) is the specific nature of substituents on the triphos ligand. In addition, the effect of metal precursors, and variations of additives have been investigated.
Half-sandwich rare-earth metal tris(alkyl) ate complexes catalyzed phosphaguanylation reaction of phosphines with carbodiimides: an efficient synthesis of phosphaguanidines
作者:Wangyang Ma、Ling Xu、Wen-Xiong Zhang、Zhenfeng Xi
DOI:10.1039/c5nj01136a
日期:——
Half-sandwich Y/Li ate complex displays better catalytic activity for phosphaguanylation reaction of phosphines with carbodiimides than the neutral yttrium complexes.
半夹 Y/Li 配合物在磷胍基化反应中显示出比中性钇配合物更好的催化活性。
Spiro[4,4]-1,6-Nonadiene-Based Diphosphine Oxides in Lewis Base Catalyzed Asymmetric Double-Aldol Reactions
Symmetry swap: A C2‐chiral spiro diphosphine oxide (SpinPO) has been found to be highly efficient and enantioselective in the catalysis of double‐aldol reactions of ketones and aldehydes to give the corresponding optically active double‐aldol products, which can be readily transformed into optically active C3‐ and pseudo‐C3‐symmetric molecules.
N-(PHOSPHINOALKYL)-N-(THIOALKYL)AMINE DERIVATIVE, METHOD FOR PRODUCING SAME, AND METAL COMPLEX THEREOF
申请人:TAKASAGO INTERNATIONAL CORPORATION
公开号:US20170233418A1
公开(公告)日:2017-08-17
The purpose of the present invention is to provide: a ligand that is useful in a catalytic organic synthetic reaction; a method for producing said ligand; and a metal complex that is useful as a catalyst in an organic synthetic reaction. The present invention provides a compound represented by general formula (1
A
), a method for producing said compound, and a metal complex including said compound as a ligand. (In the formula, H, N, P, S, L, R
1
, R
2
, R
3
, Q
1
, and Q
2
have the meaning as defined in the Description.)