[EN] HYDROGENATION OF ESTERS OR CARBONYL GROUPS WITH TETRADENTATE AMINO/IMINO-THIOETHER BASED RUTHENIUM COMPLEXES<br/>[FR] HYDROGÉNATION DE GROUPES ESTERS OU CARBONYLES AVEC DES COMPLEXES DU RUTHÉNIUM À BASE D'AMINO/IMINO-THIOÉTHER TÉTRADENTATE
申请人:FIRMENICH & CIE
公开号:WO2012084810A1
公开(公告)日:2012-06-28
The present invention relates to the field of catalytic hydrogenation and, more particularly, to the use of specific ruthenium catalysts, or pre-catalysts, in hydrogenation processes for the reduction of ketones and/or aldehydes into the corresponding alcohol respectively. Said catalysts are ruthenium complexes comprising a tetradentate ligand (L4) coordinating the ruthenium with: - two nitrogen atoms, each in the form of a primary or secondary amine (i.e. a NH2 or NH group) or N-alkyl imine functional groups (i.e. a C=N group), and - two sulfur atoms, each in the form of thioether functional groups.
HYDROGENATION OF ESTERS OR CARBONYL GROUPS WITH TETRADENTATE AMINO/IMINO-THIOETHER BASED RUTHENIUM COMPLEXES
申请人:Saudan Sylvia Joyeuse Adélaïde Ada
公开号:US20130274487A1
公开(公告)日:2013-10-17
The present invention relates to the field of catalytic hydrogenation and, more particularly, to the use of specific ruthenium catalysts, or pre-catalysts, in hydrogenation processes for the reduction of ketones and/or aldehydes into the corresponding alcohol respectively. Said catalysts are ruthenium complexes comprising a tetradentate ligand (L4) coordinating the ruthenium with: two nitrogen atoms, each in the form of a primary or secondary amine (i.e. a NH
2
or NH group) or N-alkyl imine functional groups (i.e. a C═N group), and two sulfur atoms, each in the form of thioether functional groups.
between the aromatic bromine and the aliphatic hydrogen intraannularly opposed to be removed as HBr. Spectrometric study gives quantitative data of the dependence of the molecular geometry upon the chain length and the aromatic substituents. The energy barriers ΔGc≠ of the conformational flipping are 17·4 kcal/mol (Tc 76·5°) for [6]metacyclophane (7a), 11·5 kcal/mol (Tc −28°) for [7]metacyclophane (7b),
Group 4 metallocene complexes with annulated twelve-membered ring cyclopentadienyl ligands: their synthesis, characterization and catalytic behavior in olefin polymerization
作者:Myong Woon Kim、Eunkee Hong、Taek Kyu Han、Seong Ihl Woo、Youngkyu Do
DOI:10.1016/0022-328x(96)06410-8
日期:1996.10
The synthesis, characterization and olefin polymerization properties of Group 4 compounds 1,2-(CH2)(10)(C5H3)}(2) MCl(2) (M = Ti 5, Zr 6, Hf 7) containing annulated twelve-membered ring cyclopentadienyl ligands are reported. The reactions of lithiated annulated cyclopentadiene (Li[1,2-(CH2)(10)C5H3]) with MCl(4)(THF)(2) (M = Ti, Zr) or HfCl4 in tetrahydrofuran gave new metallocene products in reasonable yields. 6 and 7 have been characterized by single crystal X-ray diffraction studies. The compound 6 [7] crystallizes in the orthorhombic space group P2(1)2(1)2(1)[P2(1)2(1)2(1)], with a = 8.188(1) [8.190(5)] Angstrom, b = 11.371(1) [11.352(5)] Angstrom, c = 30.253(1) [30.177(8)] Angstrom, Z = 4 [4] and V = 2816.6(4) [2805.7] Angstrom(3). Both compounds are isostructural and adopt a distorted tetrahedron around the metal center. The steric crowding of the annulated twelve-membered ring in 6 and 7 is greater than that of the seven-membered ring in 2-Me-4,5-(CH2)(5)Cp}2ZrCl2. The catalytic behavior of the new metallocenes in propylene and ethylene polymerization has been studied in the presence of excess amount of methylaluminoxane.