Mn(III)-complexes of tetraarylporphyrins 1-4 bearing a crown-ether covalently linked through a single flexible chain have been synthesized. Their basic frame is that of the robust tetra-(2,6-dichlorophenyl)porphyrin 5 and the chain is connected by ether linkage either to the ortho (1-2) or to the meta positions (3-4) of one meso-aryl group. Catalytic efficiency was tested in the epoxidation of the poorly reactive 1-dodecene at 0 degrees C under CH2Cl2/H2O two-phase conditions in the presence of NaOCl (pH 9.5-10.0) as oxygen donor. The results obtained led us to propose a general acid/base catalysis as an explanation for the positive effect of crown-ethers in the alkene epoxidations with this catalytic system.
Mn(III)-tetraarylporphyrins bearing covalently bonded crown-ethers: Synthesis and catalytic activity in 1-dodecene epoxidation promoted by aqueous HOCl/OCl(-) / S. Banfi, A. Manfredi, F. Montanari, G. Pozzi, S. Quici, F. Ursino. - In: JOURNAL OF MOLECULAR CATALYSIS. A: CHEMICAL. - ISSN 1381-1169. - 113:1-2(1996 Nov), pp. 369-377.
|Titolo:||Mn(III)-tetraarylporphyrins bearing covalently bonded crown-ethers: Synthesis and catalytic activity in 1-dodecene epoxidation promoted by aqueous HOCl/OCl(-)|
MANFREDI, AMEDEA GIUSEPPINA (Secondo)
|Parole Chiave:||OLEFIN EPOXIDATION; AXIAL LIGAND; MANGANESE PORPHYRINS; MN(III) PORPHYRINS; ALKENE EPOXIDATION; 2-PHASE CONDITIONS; REACTION-MECHANISM; CARBOXYLIC GROUP; IMIDAZOLE; HOCL|
|Settore Scientifico Disciplinare:||Settore CHIM/06 - Chimica Organica|
Settore CHIM/04 - Chimica Industriale
|Data di pubblicazione:||nov-1996|
|Digital Object Identifier (DOI):||http://dx.doi.org/10.1016/S1381-1169(96)00154-9|
|Appare nelle tipologie:||01 - Articolo su periodico|