Creation of a stable and well-defined active center on a solid surface is a promising protocol for designing more efficient hybrid-catalysts that bridge the gapbetweenhomogeneous and heterogeneouscatalysis. Treatment of a hydroxyapatite-bound Ru complex (RuHAP) with an aqueous solution of AgX (X = SbF6-, TfO-) afforded a new type of cationic Ru phosphate complex, having potentially vacant coordination
Palladium(II) pincer complexes of α-amino acids: towards the synthesis of catalytically active artificial peptides
作者:Gabriela Guillena、Gema Rodrı́guez、Gerard van Koten
DOI:10.1016/s0040-4039(02)00656-1
日期:2002.5
NCN palladium(II) complexes have been covalently attached to the N- and C-termini of l-valine and to the N-terminus of the dipeptide l-Phe-l-Val-OMe. Remarkably, the hydrolysis of the NCN-Pd(II) l-Val-OMe compound afforded the corresponding palladated, free amino acid without affecting the metal site. This deprotected amino acid could be coupled to any protein, enzyme or peptidic chain by simple peptide
Carbene Transfer from Triazolylidene Gold Complexes as a Potent Strategy for Inducing High Catalytic Activity
作者:Daniel Canseco-Gonzalez、Ana Petronilho、Helge Mueller-Bunz、Kohsuke Ohmatsu、Takashi Ooi、Martin Albrecht
DOI:10.1021/ja406999p
日期:2013.9.4
A series of gold(I) complexes [AuCl(trz)] were synthesized that contain 1,2,3-triazolylidene (trz) ligands with variable wingtip groups. In the presence of AgBF4, these complexes undergo ligand redistribution to yield cationic complexes [Au(trz)2]BF4 in high yields as a result of efficient carbene transfer. Identical reactivity patterns were detected for carbenegoldcomplexes comprised of Arduengo-type
Oxazoline-carboxylic acid derivatives and method for the preparation
申请人:Ajinomoto Co., Inc.
公开号:US05128478A1
公开(公告)日:1992-07-07
Optically active oxazoline-carboxylic acid derivatives of the formula: ##STR1## wherein R.sup.1 represents a hydrogen atom, an alkyl group having 1 to 20 carbon atoms, an alkykl group which is substituted and has 1 to 20 carbon atoms, a cycloalkyl group, a cycloalkyl group which is substituted, a phenyl group, a phenyl group which is substituted, a vinyl group, a vinyl group which is substituted, an ethynyl group or an ethynyl group which is substituted; R.sup.2 represents a lower alkyl group having 1 to 4 carbon atoms or a benzyl group; R.sup.3 represents a hydrogen atom, a lower alkyl group having 1 to 4 carbon atoms, a phenyl group or a benzyl group, and a method for preparing the above compounds and derivatives thereof involving a reaction between an aldehyde and an isocyano-carboxylate in the presence of a catalyst mixture.
Synthesis and application of cationic 2,6-bis(2-oxazolinyl)phenylpalladium(II) complexes
作者:Mark A Stark、Christopher J Richards
DOI:10.1016/s0040-4039(97)01309-9
日期:1997.8
Treatment of 1,3-bis(2-oxazolinyl)benzenes with LDA/TMEDA followed by the addition of PdBr2(1,5-COD) gave 2,6-bis(2-oxazolinyl)phenylbromopalladium(II) complexes. Subsequent bromide abstraction with silver salts provided a series cationic 2,6-bis(2-oxazolinyl)phenylpalladium(II) complexes that effectively catalyse the addition of a-cyano carboxylates to methyl vinyl ketone. (C) 1997 Elsevier Science Ltd.