TABLES OF SIMPLE PYRAZINES

The Tables (A.1 to AJ5) contain as complete a list as possible of the simple pyrazines described through 1978, with the addition of some compounds to 1980. The tables were prepared from Beilstein to 1929 and the index of Chemical Abstracts to 1978 (Volume 89), with the addition of some data from original papers thereafter. Melting (or boiling) points are given for most of the pyrazines listed with a selection of the best references in other cases references to preparations or alternative physical data are also recorded. 

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Recently reported physical data for pyrazine (and its salts or simple derivatives) are collected with references under pyrazine in the Appendix (Table of Simple Pyrazines). More extensive studies on such aspects of pyrazine (and some hydro or putative dehydro derivatives) are here indicated briefly with references. 

Nuclear magnetic resonance spectra. As well as numerous routine reports of NMR spectra (see individual entries in the Appendix Table of Simple Pyrazines), a brief correlation of II NMR spectra for 2-alkyl-3,5,6-triph-enylpyrazines (243) and the corresponding 2,3-dihydro derivatives (244) has appeared 137 in addition, a comparative 13C NMR study of 2-styrylpyrazine (245) with other styryldiazines and some styrylazines has been reported.1428... 

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