Alkoxyformic acid anhydrides

N-hydroxythioureas 26, 334 Carbonic acid anhydrides s. Alkoxyformic acid anhydrides... [Pg.260]

Alkoxyformic acid anhydrides, mixed s. Carboxylic alkoxyformic anhydrides Alkoxygermanes... [Pg.218]

Alkoxyformic acid anhydrides, mixed s. Carboxylic alkoxyformic anhydrides Alkoxy groups, position shift 18, 338 suppl. 26 Alkoxyhalides, ring closure 27, 279... [Pg.239]

Ethyl chloroformate/triethylamine Carboxylic acid anhydrides and amides from carboxylic acids via carboxylic alkoxyformic anhydrides Hydroxycarboxylic acid anhydrides and amides... [Pg.64]

Carboxylic acid dialkoxy-methyl esters Carboxylic alkoxyformic anhydrides... [Pg.525]

Acyl peroxides a-Alkoxyglycidic acid esters (30) 1-Carboxyacetals Carboxylic acid dialkoxy-methyl esters - alkoxyformic anhydrides... [Pg.278]

Lower valent tungsten halides are a new class of deoxygenation agents, e.g. for the conversion of carbonyl or epoxy compounds into olefins . A new reagent, generated in situ from iron pentacarbonyl and a small amount of base in moist solvents, selectively and efficiently hydrogenates the ethylenic portion of a,/ -unsaturated carbonyl compounds, such as ketones or lactones, under mild conditions. Aliphatic tert. amides can be easily reduced to alcohols by alkali metals in hexa-methylphosphoramide and a protic cosolvent such as tert-butanol. Aldehydes can be obtained from acids by catalytic reduction of intermediate carboxylic alkoxyformic anhydrides . Sec. nitro compds. are converted into ketones by the joint action of a nitrite ester and NaNOg under mild, non-acidic conditions . [Pg.9]

Esterification at room temp, with tetrachloroaluminic acid ether complex has been described The alcoholysis of a-mono-alkylacetoacetates to the corresponding esters and alkyl acetates has been accomplished with excellent yields A new modification of the Curtius degradation avoids the prepn. of acid chlorides by using in their place carboxylic alkoxyformic anhydrides intermediates well-known in peptide chemistry. Among recent developments in this latter field are the use of mixed anhydrides prepared with diphenylketene an improved peptide synthesis via azides prepared with nitrosyl chloride or butyl nitrite instead of aq. sodium nitrite and a rapid synthesis directly from acid hydrazides with N-bromosuccinimide Oligopeptides and /5-lactams have been synthesized from simple starting materials and isonitriles,... [Pg.9]

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