Advances in Heterocyclic Chemistry, Vol. 40 by Alan R. Katritzky (Ed.)

By Alan R. Katritzky (Ed.)

(from preface)Life starts at forty! definitely for Advances in Heterocyclic Chemistry the 40th quantity marks a few particularly far-reaching adjustments within the sequence. those adjustments are defined intimately within the introductory bankruptcy ''Advances in Heterocyclic Chemistry: Prospect and Retrospect'' through your editor and Carol Drum, however it is suitable to focus on crucial ideas during this preface. First, now we have addressed the long-standing challenge of indexing. quantity forty incorporates a topic index for the entire forty commonplace volumes of the sequence including the 2 supplementary volumes. also, we now have instituted an index of names of the members of chapters for our sequence, back spanning the full forty two volumes. we've additionally thoroughly revised the present index of bankruptcy titles. sooner or later, those 3 indexes will look each 5 volumes; hence the following ''index volume'' may be forty five. We think that this process will give you the greatest gain to readers of the sequence, whereas fending off undue repetition...

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In many cases, however, these other factors seem partially to cancel each other, and their net effect is not sufficient to outweigh the electrostatic contribution. The molecular electrostatic potentials, computed from CND0/2 (73CC617),INDO (75T915)and ab initio (78T275)wave functions,concerning parent five-membered heteroaromatics are shown in Figs. 10a-g. Groundstate furan presents a single region of negative potential (attractive to an electrophile)extended over the oxygen atom. There are no negative potentials near either the c1 or the fl positions (Fig.

W. Sliwa and A. Thomas, Heterocycles 20,71 (1983). V. A. Chuiguk, Khim. Geterotsikl. , 3 (1983). B. Renfroe, C. Harrington, G. Proctor, and A. Rosowsky, “Azepines,” Pt. 1. Wiley, New York, 1984. A. Rosowsky, “Azepines,” Pt. 2. Wiley, New York, 1984. W. D. Ollis, S. P. Stanforth, and C. A. Ramsden, Tetrahedron 41,2239 (1985). ADVANCES IN HETEROCYCLIC CHEMISTRY . VOL . 40 The Reactivity of Heteroaromatic Compounds in the Gas Phase M. SPERANZA Istituto di Chimica Nucleare. Area della Ricerca C N R di Roma.

The appreciable barrier calculated for the H shift from the N-protonated pyrrole to the a-protonated structure appears to be in striking contrast with the easy N + C, migration that is predicted by the molecular electrostatic potential method. While the relative stability of the a complexes may be related to the positional basicity of pyrrole, no precise prediction on orientation in the proton attack on pyrrole may be advanced on the grounds of the calculated potential-energy surface of protonated pyrrole.

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