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Replacement of C-acyl

Stereospecific Haller-Bauer ketone cleavage Replacement of C-acyl by deuterium... [Pg.354]

V. C-C linkage by replacement of O-acyl by carbon 1. Acylation by carboxylic anhydrides... [Pg.965]

Syntheses of 4,5-Unsaturated Cyclic Compounds - Swem oxidation of methyl 2,3,4-tri-C>-acetyl-a-D-glucopyranoside followed by base-induced elimination of acetic acid afforded unsaturated aldehyde 33. Further transformation of the aldehyde group into a methylene unit by way of a Wittig olefination and replacement of the acyl groups with benzyls or methyls yielded 34 which underwent a Diels-Alder reaction (the acyl protected variant of 34 was unreac-tive) with 2-methoxycarbonyl-p-benzoquinone, followed by acid-catalysed double... [Pg.178]

Although acyl imidazoles can be replaced by phenyl esters in some cases,23 acyl imidazoles are more effective for the acylation of nitroalkanes. A combination of diethyl phosphorcyani-dates and triethylamime allows the direct C-acylation of nitromethane by aromatic carboxylic... [Pg.129]

Vinylsilanes (8, 491 492) attylic alcohols (9, 340). Details are available for conversion of a ketone to a vinylsilane in which the C—Si bond has replaced the C -O group (cncsilylation). The reaction affords the less substituted vinylsilane in the case of unsymmetrical ketones. The paper includes details for use of vinylsilanes for cyclopcntenone annelalion by l riedel-Crafts acylation with acryloyl chlorides and subsequent cyclization of pentadienyl cations (9, 498-499).1... [Pg.96]

See other pages where Replacement of C-acyl is mentioned: [Pg.36]    [Pg.159]    [Pg.287]    [Pg.287]    [Pg.288]    [Pg.35]    [Pg.466]    [Pg.458]    [Pg.122]    [Pg.55]    [Pg.56]    [Pg.298]    [Pg.36]    [Pg.159]    [Pg.287]    [Pg.287]    [Pg.288]    [Pg.35]    [Pg.466]    [Pg.458]    [Pg.122]    [Pg.55]    [Pg.56]    [Pg.298]    [Pg.420]    [Pg.814]    [Pg.162]    [Pg.965]    [Pg.76]    [Pg.38]    [Pg.38]    [Pg.178]    [Pg.607]    [Pg.88]    [Pg.219]    [Pg.241]    [Pg.260]    [Pg.117]    [Pg.183]    [Pg.152]    [Pg.94]    [Pg.274]    [Pg.1526]    [Pg.415]    [Pg.42]    [Pg.178]    [Pg.67]    [Pg.348]    [Pg.395]    [Pg.48]    [Pg.232]    [Pg.38]    [Pg.1705]    [Pg.298]    [Pg.495]    [Pg.284]   


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C-Acylation

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