Reference

Preparation and catalytic application of MCM-41 modified with a ferrocene carboxyphosphine and a ruthenium complex

Preparation and catalytic application of MCM-41 modified with a ferrocene carboxyphosphine and a ruthenium complex. Stepnicka, Petr; Demel, Jan; Cejka, Jiri (Department of Inorganic Chemistry, Faculty of Science, Charles University, Prague CZ-128 40, Czech Rep.). Journal of Molecular Catalysis A: Chemical, 224(1-2), 161-169 (English) 2004 Elsevier B.V. CODEN: JMCCF2. ISSN: 1381-1169. DOCUMENT TYPE: Journal CA Section: 67 (Catalysis, Reaction Kinetics, and Inorganic Reaction Mechanisms) Section cross-reference(s): 22, 23 Reaction of 1'-(diphenylphosphino)ferrocenecarboxylic acid (Hdpf) with mesoporous mol. sieve MCM-41 gives immobilized carboxyphosphine (3), which was further reacted with [{Ru(h6-p-cymene)Cl(m-Cl)}2] (1) to afford Ru/carboxyphosphine-modified mol. sieve 4. A simple reaction between MCM-41 and 1 afforded Ru-only modified mol. sieve 5. Materials 4 and 5 were tested as catalysts for the reaction of propargyl alc. with benzoic acid to give 2-oxopropyl benzoate (6). 107-19-7 and 6656-60-6 are also in the experiment. The reactions catalyzed with immobilized catalysts are slower and give lower yields of the ester as compared to the homogeneous precatalyst [Ru(h6-p-cymene)(Hdpf-kP)Cl2] (2), which was prepd. from Hdpf and the dimer 1. Formation of ester 6 catalyzed with 4 and 5 competes with a parallel, propargyl alc. consuming process, which occurs also with MCM-41 itself in the absence of benzoic acid and ruthenium compds. The solid-state structure of 2×CH2Cl2 has been detd. by single-crystal X-ray diffraction. .