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Phenylglyoxal diethyl acetal

Another efficient 1,2-diamine for synthesis of cyanopyrazines is 2,3-diamino-3-phenylthioacrylonitrile 135, an adduct of thiophenol to aminomalononitrile tosylate (Scheme 37). The condensation with phenylglyoxal diethyl acetal affords a mixture of two possible isomers 136 and 137, whose regioselectivity is improved by addition of trifluoroacetic acid finally, the isomer 136 is isolated in 86% yield <2001SC725>. [Pg.305]

Oxidation of ketones. Manning and Stansbury " treated 1 mole of acetophenone In ethanol at 23-30° with 1.6 moles of nitrosyl chloride and warmed the mixture grailually to 60°. At the end of the process, by-product esters were saponified with alkali and phenylglyoxal diethyl acetal was isolated easily in 53% yield. [Pg.1110]

CAS 6175-45-7 64131-70-0 EINECS/ELINCS 228-220-4 Synonyms DEAP a,a-Diethoxyacetophenone Phenylglyoxal 2-diethyl acetal... [Pg.1071]

Synonyms DEAP a,a-Diethoxyacetophenone Phenylglyoxal 2-diethyl acetal... [Pg.1293]

See other pages where Phenylglyoxal diethyl acetal is mentioned: [Pg.335]    [Pg.335]    [Pg.57]    [Pg.588]    [Pg.112]    [Pg.3320]   
See also in sourсe #XX -- [ Pg.753 ]



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