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PhNHOH, reaction with

Addition of aldehydes (360) to / -nitrostyrene (361), catalysed by the prolinol derivative (256a) and followed by the reaction with PhNHOH, afforded isoxazolidines (362). ° The prolinethiol ether (253), mentioned earlier, catalysed the Michael addition of ketones R CH2COR to halogenated nitroalkenes ArCH=C(X)CH=CHN02 (X = halogen) under solvent-free conditions with up to >99% ee and >99 1 drp ... [Pg.456]

Two papers have appeared on hydroxylamines.88,89 Methylation of X -phenylhydr-oxylamine PhNHOH with methyl 4-methoxyphenylsulfonate (102) and related sulfonates in DMSO gave alkylation of the O atom rather than the N atom. The crucial role of the zwitterion (103) is examined.88 The fragmentation of the A -nitrosohydr-oxylamines (104) is stepwise and not concerted and NO is liberated in the reactions.89 These conclusions were reached from kinetic, millimetre-wave spectroscopy and 17 O NMR studies. [Pg.53]

See other pages where PhNHOH, reaction with is mentioned: [Pg.415]    [Pg.124]    [Pg.249]    [Pg.501]    [Pg.782]    [Pg.297]    [Pg.937]    [Pg.107]    [Pg.789]    [Pg.297]    [Pg.937]    [Pg.389]   
See also in sourсe #XX -- [ Pg.456 ]



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