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Cocrystalline salts of alkynoic acids. II. the crystal and molecular structure of 5-bromo-2-aminopyridinium propynoate

✍ Scribed by Shai Vaday; Bruce M Foxman

Publisher: Elsevier Science
Year: 1999
Tongue: English
Weight: 197 KB
Volume: 2
Category: Article
ISSN: 1463-0184
DOI: 10.1016/s1463-0184(99)00015-5

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✦ Synopsis

A new cocrystalline salt, 5-bromo-2-aminopyridinium propynoate 7, has been synthesized. Inspection of the crystal structure reveals that the packing differs markedly from that of the chemically analogous species 2-aminopyridinium propynoate 1. While 1 undergoes a thermally-induced Michael addition reaction in the solid state, compound 7 is thermally stable. The lack of similarity between the crystal structures of 1 and 7 may arise from a set of favorable, infinite Br . . . Br interactions (3.82-3.84 Å). Short contacts between acetylenic carbon atoms are also characterized and discussed.

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