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Cleavage with super acids

Diacids.— Dicarboxylic acids are obtained by the reaction of y-butyrolactones with carbon monoxide at atmospheric pressure and room temperature in HF-SbFs super acid media. A double-bond cleavage reaction of silyl enol ether using Mo02(acac)2 Bu OOH as oxidizing agent leads to a diacid in the case of (11) and to a ketoacid with (12) yields are high for the nine examples studied. ... [Pg.101]

The benzyl ethers of serine and threonine are stable under the acidic conditions used in the Boc strategy. Cleavage of the benzyl ethers is performed with HF under normal conditions or with nnixtures of super adds. Especially in the case of large peptides with many benzyl ether groups, side reactions result from the intermediate benzyl halides that can react with unprotected functionalized side chains scavengers are added to avoid such side reactions. A modified TMSBr method has also been developed. ... [Pg.351]

See other pages where Cleavage with super acids is mentioned: [Pg.133]    [Pg.220]    [Pg.531]    [Pg.211]    [Pg.348]    [Pg.353]    [Pg.366]    [Pg.760]    [Pg.228]    [Pg.231]    [Pg.421]    [Pg.201]    [Pg.136]    [Pg.1056]    [Pg.1056]    [Pg.27]    [Pg.151]    [Pg.330]    [Pg.55]    [Pg.163]    [Pg.261]   
See also in sourсe #XX -- [ Pg.814 ]



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