Chemoselective control of hydrogenation among aromatic carbonyl and benzyl alcohol derivatives using Pd/C(en) catalyst
作者:Kazuyuki Hattori、Hironao Sajiki、Kosaku Hirota
DOI:10.1016/s0040-4020(01)00421-5
日期:2001.6
of aromatic ketones and aldehydes quite smoothly give the corresponding methylene compounds via the formation of the intermediary benzylalcohols in the presence of Pd/C as a catalyst. Therefore, it is extremely difficult to isolate the intermediary benzylalcohol selectively. This paper describes a mild and chemoselective hydrogenation method of an aromatic carbonyl compound to benzylalcohol using
Photorearrangement and electron transfer photooxidation of 1-acetoxy-1,2-diphenylcyclopropane
作者:Felipe Algarra、María V. Baldoví、Hermenegildo García、Miguel A. Miranda、Jaime Primo
DOI:10.1016/s0040-4020(01)80242-8
日期:1993.1
deuterium incorporation to C(1) and C(3) in MeOD. Photosensitization by acetone resulted exclusively in trans to cis isomerization, via the diradical III (process i). Finally electron transfer activation by means of cerium(IV) ammonium nitrate (CAN) or excited triphenylpyrylium tetrafluoroborate (TPT) gave rise to chalcone (7) or the β-functionalized ketones 8 or 9. These products must arise from a common cationic
The crossed aldol reaction of enol esters, which are weak carbon nucleophiles, with aldehydes was effectively carried out under mild conditions by using a catalytic amount of several cationic species paired with tetrakis(pentafluorophenyl)borate.