15114-55-3Relevant academic research and scientific papers
USE OF A RUTHENIUM CATALYST COMPRISING A TETRADENTATE LIGAND FOR HYDROGENATION OF ESTERS AND/OR FORMATION OF ESTERS AND A RUTHENIUM COMPLEX COMPRISING SAID TETRADENTATE LIGAND
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Page/Page column 22, (2019/08/20)
The present invention relates to the use of a transition metal catalyst TMC1, which comprises a transition metal M selected from metals of groups 7, 8, 9 and 10 of the periodic table of elements according to IUPAC and a tetradentate ligand of formula I wherein R1 are identical or different and are each an organic radical having from 1 to 40 carbon atoms, and R2 are identical or different and are each an organic radical having from 1 to 40 carbon atoms, as catalyst in processes for formation of compounds comprising at least one carboxylic acid ester functional group -O-C(=O)- starting from at least one primary alcohol and/or hydrogenation of compounds comprising at least one carboxylic acid ester functional group -O-C(=O)-. The present invention further relates to a process for hydrogenation of a compound comprising at least one carboxylic acid ester functional group -O-C(=O)-, to a process for the formation of a compound comprising at least one carboxylic acid ester functional group -O-C(=O)- by dehydrogenase coupling of at least one primary alcohol with a second alcoholic OH-group, to a transition metal complex comprising the tetradentate ligand of formula I and to a process for preparing said transition metal complex.
Comparative structural studies on silver(I) complexes with tripodal polyphosphines. Crystallographic characterisation of the first infinite chain structures in 2:1 adducts of silver(I) halides with 1,1,1-tris(diphenylphosphinomethyl)ethane
Montes, Jose A.,Rodriguez, Susana,Fernandez, Damian,Ines Garcia-Seijo,Gould, Robert O.,Garcia-Fernandez, M. Esther
, p. 1110 - 1118 (2007/10/03)
The AgX salts [X = Cl, Br, I, NO3] react with CP3 [MeC(CH2PPh2)3], PP3 [P(CH2CH2PPh2)3] and NP3 [N(CH2CH2PPh2)3] in 1:1 stoichiometric ratio to afford complexes Ag(CP3)X [X = Cl (1), Br (2), I (3)], Ag(PP3)Cl (4), Ag(NP3)Cl (6) and Ag(NP3)(NO3) (7) where Ag(I) is bound to three P atoms of the ligand. The X-ray crystal structure of complex 6 consists of a mononuclear compound with absence of the N atom of NP3 in the coordination to the metal. The 1:1 complex obtained by reaction of AgNO3 with PP3 was shown by conductivity measurements, mass spectrometry, infrared and NMR spectroscopy to be a dinuclear ionic complex [Ag2(PP3)2](NO3)2 (5) where Ag(I) shows three- and four-coordination. The interaction of AgX halides with CP3 in 2:1 stoichiometric ratio leads to complexes Ag2(CP3)X2 [X = Cl (8), Br (9), I (10)] which were shown by X-ray crystallography to consist of infinite zigzag (X = Cl, I) or linear (X = Br) chains containing three- and four-coordinate Ag(I) and constituting the first examples of such complexes with CP3. These polymeric chains did not give reaction with another equivalent of AgX to form the Ag3(CP3)X3 [X = Cl, Br, I] complexes. The 2:1 and 3:1 nitrate derivatives Ag2(PP3)(NO3)2 (11), Ag2(NP3)(NO3)2 (12), Ag3(PP3)(NO3)3 (13) and Ag3(NP3)(NO3)3 (14) show participation of the nitrate anion as ligand finding for 13 two different geometries about Ag(I) in solution. Complexes 13 and 14 react with the corresponding phosphines PP3 and NP3 to form complexes 5 and 7, respectively involving ring-closure reactions.
