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標題: Reduction of aldehydes and ketones catalyzed by a novel aluminum alkoxide: Mechanistic studies of Meerwein-Ponndorf-Verley reaction
作者: Liu, Y.C.
Ko, B.T.
Huang, B.H.
Lin, C.C.
關鍵字: hydrogen-transfer;polymerization;conformation;heterocycles;aryloxides;complexes
Project: Organometallics
期刊/報告no:: Organometallics, Volume 21, Issue 10, Page(s) 2066-2069.
Treatment of 2,2'-methylenebis(4,6-di(1-methyl-1-phenylethyl)phenol (MMPEP-H-2) with I molar equiv of Me3Al in toluene gives [(mu-MMPEP)AlMe](2), which further reacts with 2 molar equiv of 2-propanol or benzyl alcohol, affording a four-coordinated aluminum complex, [(MMPEP)Al(mu-OR)](2) (1, R = Pr-i; 2, R = Bn) in high yield, whereas [(MMPEP)Al(mu-OBn)(O=CHPh)](2) (3) can be obtained either by the reaction of 2 with 2 molar equiv of benzaldehyde or by the reaction of 1 with 4 molar equiv of benzaldehyde. Compound 1 has shown great catalytic activities toward Meerwein-Ponndorf-Verley (MPV) hydrogen transfer reactions of aldehydes and ketones. A melting point depressing experiment indicates that in the catalytic reaction a four-coordinated aluminum complex [(MMPEP)Al((OPr)-Pr-i)(OCRR')] formed as an intermediate.
ISSN: 0276-7333
DOI: 10.1021/om0200454
Appears in Collections:化學系所

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