Ruthenium piano-stool complexes containing mono- or bidentate pyrrolidinylalkylphosphines and their reactions with small molecules
摘要:
Ruthenium piano-stool complexes incorporating the new bidentate aminoalkylphosphine ligand 1,2-bis(dipyrrolidin-1-ylphosphino) ethane (dpyrpe, I) or its monodentate counterpart bis(pyrrolidin-1-yl) methylphosphine (pyr(2)PMe, II) have been prepared, [(C5R5)RuCl(PP)] (R = Me and PP = dpyrpe, 1; R = Me and PP = (pyr(2)PMe)(2), 2; R = H and PP = dpyrpe, 3). Complexes 2 and 3 have been characterized by X-ray crystallography. Complexes 1 and 2 react with NaBAr4f in the presence of ligand L to yield [Cp*Ru(L)(dpyrpe-kappa P-2)][BAr4f] (L = MeCN, 4a; CO, 4b; N-2, 4c) and [Cp*Ru(L)(pyr(2)PMe)(2)][BAr4f] (L = MeCN, 5a; CO, 5b; N-2, 5c). Complex 4a was crystallographically characterized. The CO complexes 4b and 5b were examined using IR spectroscopy in an attempt to establish the electron-donating capabilities of I and II. Complex 1 oxidatively adds H-2 in the presence of NaBAr4f to yield the Ru(IV) dihydride [Cp*RuH2(dpyrpe-kappa P-2)][BAr4f], 7. (C) 2011 Elsevier B.V. All rights reserved.
P–N bond formation as a route to highly electron rich phosphine ligands
作者:Matthew L. Clarke、David J. Cole-Hamilton、Alexandra M. Z. Slawin、J. Derek Woollins
DOI:10.1039/b004893n
日期:——
Phosphines containing two N-bound pyrrolidine groups and one alkyl or aryl group are unusually electronrich σ-donor ligands when compared to either tris(N-pyrrolidinyl)phosphine or trialkyl- and triaryl-phosphines.
New proline derived chiral building blocks for nucleoside methylphosphonate synthesis
作者:Pia Rosmanitz、Stefan Eisenhardt、Jan W. Bats、Joachim W. Engels
DOI:10.1016/s0040-4020(01)85640-4
日期:1994.1
P-Prolyl-nucleoside-P-methyl-phosphonamidites, P-chiral buildingblocks for nucleoside methylphosphonate synthesis were prepared by two different methods. First starting from dichloromethylphosphine 1 prochiral bis-proline-methylphosphines 3a-e were obtained. Their reaction with tritylthymidine in presence of an acid like tetrazole or better 2,6-di-tert.-butyl-4-methyl-pyridinium-tetrafluoroborate
Highly electron rich alkyl- and dialkyl-N-pyrrolidinyl phosphines: an evaluation of their electronic and structural properties
作者:Matthew L. Clarke、Gemma L. Holliday、Alexandra M. Z. Slawin、J. Derek Woollins
DOI:10.1039/b108467d
日期:2002.3.8
Phosphines containing two N-bound pyrrolidine groups and one alkyl or aryl group have been prepared and shown to be unusually electron rich donor ligands when compared to either tris(N-pyrrolidinyl)phosphine or the trialkyl- or triaryl-phosphines. It is proposed that the electron donating ability of a pyrrolidine group towards phosphorus had been underestimated as only two pyrrolidinyl groups can donate towards the phosphine via the nitrogen lone pair. trans-L2Rh(CO)Cl complexes have been prepared from the phosphines and used to quantify the electron donor characteristics. Two of these complexes have been characterised by X-ray crystallography. The reaction of these phosphines with iron(II) complexes has also been studied. Platinum(II) complexes of the ligands have been prepared and also (in three examples) characterised by X-ray crystallography, which has enabled the steric and bonding properties to be evaluated. tert-Butyl(dipyrrolidinyl)phosphine
is one of the most electron rich phosphines known. The dialkyl(pyrrolidinyl)phosphines have been found to contain less potent N→P donation, and are somewhat less good donor ligands.
Utilisation pour le décapage de la couleur artificielle des fibres kératiniques d'une composition comprenant au moins une phosphine à titre d'argent réducteur majoritaire
申请人:L'OREAL
公开号:EP1598053A1
公开(公告)日:2005-11-23
La présente invention a pour objet l'utilisation pour le décapage de la couleur artificielle des fibres kératiniques d'une composition comprenant au moins une phosphine ou l'un de ses sels d'addition avec un acide à titre d'agent réducteur majoritaire, le procédé de décapage de la couleur artificielle des fibres kératiniques mettant en oeuvre cette composition et un dispositif à plusieurs compartiments destiné à la teinture puis au décapage de la couleur artificielle des fibres kératiniques.
La présente invention fournit un produit de décapage de la couleur artificielle des fibres kératiniques teintes avec une large palette de colorants d'oxydation et / ou de colorants directs, qui n'induit pas d'éclaircissement de la base naturelle des fibres kératiniques, qui soit plus pratique d'utilisation et qui limite la sensibilisation des fibres kératiniques.
EGGSHELL MEMBRANE SOLUBILIZATION METHOD USING ENZYMES
申请人:Amano Enzyme Inc.
公开号:EP2612922A1
公开(公告)日:2013-07-10
The present invention addresses the problem of providing an eggshell membrane solubilization method that is capable of solving the problems associated with carrying out treatment using acids and alkalis, or problems associated with the processing methods of the conventional art that use proteases; in other words, an eggshell membrane solubilization method that is capable of solving at least one of the following problems: (1) the need for pretreatment such as pulverization, sonication or boiling; (2) the need for prolonged treatment; and (3) a low decomposition rate (approximately 20%). Eggshell membranes are efficiently solubilized by using a protease in combination with a reducing agent.