[EN] N-substituted pyridiniophosphines, processes for their preparation and their use<br/>[FR] PYRIDINIOPHOSPHINES N-SUBSTITUÉES, LEURS PROCÉDÉS DE PRÉPARATION ET LEUR UTILISATION
申请人:STUDIENGESELLSCHAFT KOHLE MBH
公开号:WO2015165781A1
公开(公告)日:2015-11-05
The present invention deals with the synthesis and applications of new cationic compounds being useful as metal ligands. Specifically, N-alkyl/aryl substituted pyridiniophosphines are prepared and used as ligands for transition metals. The so- obtained metal complexes and their use as catalysts in chemical synthesis is also described. It also worth to mention that N-alkyl/aryl pyridiniophosphines can be synthesized through a short, scalable and highly modular route.
A new family of cationic ligands, N‐alkyl/aryl pyridiniophosphines, has been synthesized through a short, scalable, and highly modularroute. Evaluation of their electronic properties evidenced weak σ‐donor and quite strong π‐acceptor character when used as ancillary ligands. These attributes confer a substantially enhanced π‐acidity to the PtII and AuI complexes thereof derived and, as result, they
C<sub>6</sub>
-Selective Direct Arylation of 2-Phenylpyridine <i>via</i>
an Activated <i>N</i>
-methylpyridinium Salt: A Combined Experimental and Theoretical Study
incorporation studies revealed that the C−Hbond acidity is improved significantly in N‐methylpyridinium salts compared with their N‐Oxide and N‐iminopyridinium ylide counterparts, thus solving the long‐standing problem associated with previous strategies for the synthesis of diaryl pyridines. Finally, the control experiments and DFT calculations supported a Pd‐catalyzed and Cu‐mediated mechanism in
A first structural and theoretical comparison of pyridinylidene-type rNHC (remote N-heterocyclic carbene) and NHC complexes of Ni(<scp>ii</scp>) obtained by oxidative substitution
作者:Sabine K. Schneider、Gerrit R. Julius、Christoph Loschen、Helgard G. Raubenheimer、Gernot Frenking、Wolfgang A. Herrmann
DOI:10.1039/b512419k
日期:——
A series of cationic pyridinylidene and quinolinylidene complexes of chlorobis(triphenylphosphine)nickel(II) were prepared by oxidative substitution of Ni(PPh3)4 with methylated chloropyridines or chloroquinolines. NMR as well as X-ray crystallographic studies confirmed the trans arrangement of the two phosphines in the products. Calculations, using suitable model compounds at the BP86/TZVP level,