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77Se and 15N NMR investigation of some cycloalkeno-1,2,3-selenadiazole derivatives

✍ Scribed by Helmut Duddeck; Petra Wagner; Dieter Müller; Joseph Csaba Jászberényi

Publisher
John Wiley and Sons
Year
1990
Tongue
English
Weight
390 KB
Volume
28
Category
Article
ISSN
0749-1581

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✦ Synopsis

Abstract

The ^13^C, ^15^N and ^77^Se NMR data (chemical shifts and coupling constants) of some cycloakeno‐1,2,3‐selenadiazoles are presented. Extremely large ^77^Se chemical shifts are found. ^15^N, ^77^Se coupling constants, obtained at natural abundance, are reported for the first time. Strong signal shifts due to different sizes of the cycloakeno rings can be qualitatively rationalized in terms of electron transfer between the nitrogen and selenium atoms. A positive γ‐syn effect of the methyl group on N‐3 is found in 4‐methyl‐4,5,6,7‐tetrahydrobenzo‐1,2,3‐selenadiazole.

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