Amides (1970)

Content:
Chapter 1 Molecular and digital constitution of the amide workforce (pages 1–72): M. B. Robin, F. A. Bovey and Harold Basch
Chapter 2 Synthesis of amides (pages 73–185): A. L. J. Beckwith
Chapter three Acid?base and complexing houses of amides (pages 187–243): R. B. Homer and C. D. Johnson
Chapter four Rearrangement and removal of the amido staff (pages 245–288): Joseph F. Bieron and Frank J. Dinan
Chapter five Photochemistry of the amido crew (pages 289–308): Ionel Rosenthal
Chapter 6 Radiation chemistry of amides (pages 309–334): Owen H. Wheeler
Chapter 7 Chemistry of imidic compounds (pages 335–381): Owen H. Wheeler and Oscar Rosado
Chapter eight The chemistry of thioamides (pages 383–475): W. Walter and J. Voss
Chapter nine The chemistry of the thiohydrazide crew (pages 477–514): W. Walter and ok. J. Reubke
Chapter 10 The chemistry of hydrazides (pages 515–600): Hans Paulsen and Dieter Stoye
Chapter eleven organic formation and reactions of the amido crew (pages 601–684): J. E. Reimann and R. U. Byerrum
Chapter 12 Directing and activating results of the amido workforce (pages 685–729): J. A. Shafer
Chapter thirteen Reactions of the carboxamide team (pages 731–857): Brian G. Challis and Judith A. Challis

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Extra resources for Amides (1970)

Sample text

This procedurc, howcvcr, even if fully implemented, would not be totally satisfactory sincc it neglects the change in correlation cnergy due to the different * Calculated cm2, which is upper limit of calculated and assuming a I4X’nuclear quadrupole moment of 1 4 7 0 x an csperimental lower limit to this quantity. 601 x em2, leads to equally good agreement between experimental quadrupole coupling constants. 1 . Molecular and elcctronic structure of t h c amidc group 49 number of electron pairs in the closed-shell ground state and the open-shell excited state.

From careful measurements of the line shape and application of the Bloch equations, rate constants may be determined as a function of temperature and from these the activation entropy AS* and activation enthalpy AH* (in the Eyring formulation) may be obtained from a n Arrhenius plot in the usual way. I n its simplest form, the line-shape function 66*67 describing the spectra of Figure 7 takes account only of broadening arising from the kinetic exchange process, but not from spin-spin relaxation, characterized by the relaxation time T,, nor is account taken of scalar coupling of the nuclei to each other or to other nuclei-the formyl proton in the present case.

The amides are listed in order of complexity of the group attached to the carbonyl, and within each such class, in order of complexity of the groups attached to nitrogen. Kinetic data are expressed in terms of the Eyring formulation, on the assumption (not necessarily valid) that the transmission coefficient is unity, and therefore that AS* is given by 2*303R(logA - log k T / h ) ,A being the frequency factor. In some respects, these data are discouraging. T h e disagreement in the reported magnitude of AH* and in the magnitude and sign of AS* for the same compound makes it difficult to draw any conclusions concerning the effects even of major structural variations, much less those of solvent and concentration.

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