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Orthoformic acid esters

This difference in driving force is used in the dimethyl-or diethylacetalizations of carbonyl compounds with orthoformic acid esters since these acetalizations are simply linked with the hydrolysis of an orthoester into a normal ester. [Pg.374]

One can also acetalize carbonyl compounds completely without using the alcohol in excess. This is the case when one prepares dimethyl or diethyl acetals from carbonyl compounds with the help of the orthoformic acid esters trimethyl orthoformate HC(OCH3)3 or triethyl orthoformate HC(OC2H5)3, respectively. In order to understand these reactions, one must first clearly understand the mechanism for the hydrolysis of an orthoester to a normal ester (Figure 7.16). It corresponds step by step to the mechanism of hydrolysis of <9,<9-acctals, which was detailed in Figure 7.15. The fact that the individual steps are really strictly analogous becomes very clear when one takes successive looks at... [Pg.290]

The preparation of orthoformic acid esters from chloroform and alkali metal alkoxides is a long known procedure, " which can be performed under phase transfer catalysis. If small amounts of alcohol are present in the phase-catalyz process, cyclopropanes (372 Scheme 67) can be produced by aHHifinn of dichlorocarbene to l,2-dialkoxy-l,2-dichloroethylenes, which are thought to be intermediates. " Al-kenes of this kind, e.g. (373 equation 176), have been observed as byproducts in the synthesis of tri-r-butylorthoformate from chlorodifluoromethane or dichlorofluoromethane and potassium r-butoxide. Trimethoxyacetonitrile was prepared from trichloroacetonitrile and sodium methoxide. ... [Pg.556]

Gross, H., and Costisella, B., a-Substituted phosphonates. Part I. Reaction of orthoformic acid esters and phosphorons(in) componnds, J. Prakt. Chem., 311, 571, 1969. [Pg.245]

Triphenylacetic acid Ethylene derivatives from cyclic orthoformic acid esters... [Pg.211]

Ethyl chloroformate, ClCOOC Hg-i Methyl trichloroacetate Diethyl oxalate Ethyl malonate Orthoformic acid esters. Ethyl orthoformate (RCO) O (CH CO) O, (C fiO)fi, (CF,COkO n-Octanoic anhydride (C,H,C0),0 R-OOH,C,Hg-OOH Cumene hydroperoxide Peroxides... [Pg.260]

Nitro compounds, ar. Nitrobenzene, m-Dinitrobenzene o Nitrophenol N-Nitramines Oxonium fluoroborate Trialkyloxonium salt T rialkyloxonium fluoroborate Pyrylium fluoroborate Carboxylic acid esters HCOOC2HS, p-Nitro-phenyl formate Isopropenyl acetate Ethyl cyanoacetate Chloroformic acid esters Ethyl chloroformate Methyl trichloroacetate Diethyl oxalate Ethyl malonate Orthoformic acid esters, Ethyl orthoformate (RC0)20 (CHsC0)20,... [Pg.277]

Esterification with orthoformic acid esters COOH -> COOR... [Pg.381]

Methanesulfonic acid/orthoformic acid ester Beckmann fragmentation... [Pg.454]

Ethyl chloroformate, ClCOOBu-i, ClCOOBu-s Methyl trichloroacetate Diethyl oxalate Ethyl malonate Orthoformic acid esters. Ethyl orthoformate (RCO)fi... [Pg.630]

Orthoformic acid esters by transesterification with cleavage of 0,0-isopropylidene derivatives... [Pg.98]

Alkoxygermanes from orthoformic acid esters Alkoxychlorogermanes s. 19, 151 GeHal Ge OR... [Pg.439]

See other pages where Orthoformic acid esters is mentioned: [Pg.14]    [Pg.111]    [Pg.8]    [Pg.225]    [Pg.210]    [Pg.214]    [Pg.61]    [Pg.80]    [Pg.99]    [Pg.123]    [Pg.269]    [Pg.445]    [Pg.65]    [Pg.267]    [Pg.289]    [Pg.289]    [Pg.449]    [Pg.228]    [Pg.244]    [Pg.461]    [Pg.77]    [Pg.220]    [Pg.296]    [Pg.321]    [Pg.512]   


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Orthoform

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