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Ring-chain tautomerism acetals

Thiazolidines (76) undergo facile ring-chain tautomerism, thus affording a latent source of thiol-imine, which can be trapped with ethyl mercapto-acetate at 100°-110° to afford 77 in low yield [Eq. (22)].63 If the corresponding acid is used and water is continuously removed, the yield of 77 approaches 75%. [Pg.96]

Solid-state structure of bicyclic 1,3,5-trioxocane 4 was studied and supported with molecular mechanics computational data to determine its ring-chain tautomerism with keto acetal 5 (see Section 14.08.2.2.1 <1998J(P1)2353>). [Pg.479]

The first of these decarboxylations is catalyzed by the cytoplasmic uroporphyrinogen decarboxylase, which removes the carboxylate groups of the four acetate side chains sequentially from the D, A, B, and C rings.395-3963 A possible mechanism, utilizing a tautomerized ring, is illustrated in the accompanying structural formula. [Pg.1400]

See other pages where Ring-chain tautomerism acetals is mentioned: [Pg.423]    [Pg.75]    [Pg.196]    [Pg.12]    [Pg.283]    [Pg.227]    [Pg.51]    [Pg.370]    [Pg.67]    [Pg.337]    [Pg.616]    [Pg.277]    [Pg.115]    [Pg.455]    [Pg.1003]    [Pg.961]    [Pg.156]    [Pg.294]    [Pg.264]    [Pg.83]    [Pg.294]    [Pg.174]    [Pg.41]   
See also in sourсe #XX -- [ Pg.14 , Pg.31 , Pg.32 ]



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Ring, chain

Ring-chain tautomerism

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