Intermolecularhydroacylation between salicylaldehydes 1, 26−40 and 1,4-penta- or 1,5-hexadienes 4−13 by Rh-catalyst proceeded under mild reaction conditions to give a mixture of iso- and normal-hydroacylated products 14−25, 41−55, and 57−60. In the hydroacylationreaction, chelation of both salicylaldehyde and diene to the Rh-complex plays a crucial role. The ratio of iso- and normal-hydroacylated
[reaction: see text] Rh-Catalyzed intermolecularhydroacylation between salicylaldehydes and 1,5-hexadienes proceeded under remarkably mild reaction conditions to afford a mixture of iso- and normal-hydroacylated products in good yields. The experiments using deuterated salicylaldehyde-d revealed that "double chelation" of salicylaldehyde and 1,5-hexadiene to Rh-complex played vital roles in the catalytic
Structures and pesticidal activities of derivatives of dinitro-phenols. Part IV. Preparation of certain 2-(α-branched alkyl)-4,6-dinitro- and 4-(α-branched alkyl)-2,6-dinitro-phenols
作者:M. Pianka、J. D. Edwards
DOI:10.1039/j39670002281
日期:——
Twenty-one 2-(α-branchedalkyl) phenols and thirty-one 4-(α-branchedalkyl) phenols with alkyl groups containing from 5 to 13 carbon atoms were synthesised by condensation, in ether, of a 2- or 4-acyl-phenol or the more soluble-anisole with an alkylmagnesium bromide, dehydration to the alkenyl derivative, hydrogenation, and, where required, demethylation of the anisole. The 2- and 4-alkyl phenols were
Rh-catalyzed intermolecularhydroacylation between salicylaldehyde and alkenylnitriles proceeded at room temperature to preferentially give normal-hydroacylated products. Addition of CH3CN and NaOAc accelerated the Rh-catalyzed hydroacylation of monoolefins to exclusively produce the normal-hydroacylated products under mild reaction conditions. Plausible mechanisms for the regioselections are also
The first enantioselective chiral phosphoricacid-catalyzedtransferhydrogenation of unprotected ortho-hydroxyaryl alkyl N−H ketimines using Hantszch di-tert-butyl ester as a reductant is reported. A variety of ortho-hydroxybenzylamines were obtained in good to excellent yields and enantiomeric excesses.