The reactivity of several nitrating mixtures with amides has been compared. Ammonium nitrate/trifluoroacetic anhydride, morpholinium nitrate/trifluoroacetic anhydride, and morpholinium nitrate/heptafluorobutyric anhydride are the reagents of choice since, in CH2Cl2 at 0-degrees-C, they give N-alkyl-N-nitrocarboxamides and N-nitrolactams in excellent yields. Mechanistic details of these nitrations have been elucidated. Trifluoroacetyl nitrate, which arises from the reaction R2NH2+NO3- + 2(CF3CO)2O --> CF3COONO2 + CF3CONR2 + 2CF3COOH, appears to cause the direct N-nitration of carboxamides.
TORRA, NURIA;URPI, FELIX;VILARRASA, JAUME, TETRAHEDRON, 45,(1989) N, C. 863-868
作者:TORRA, NURIA、URPI, FELIX、VILARRASA, JAUME
DOI:——
日期:——
GARCIA, J.;GONZALEZ, J.;SEGURA, R.;URPI, F.;VILARRASA, J., J. ORG. CHEM., 1984, 49, N 18, 3322-3327
作者:GARCIA, J.、GONZALEZ, J.、SEGURA, R.、URPI, F.、VILARRASA, J.
DOI:——
日期:——
REDUCTION OF CARBOXYL END GROUPS IN POLYESTER WITH LACTIM ETHERS