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Boron heterocycles derived from 2-guanidinobenzimidazole

✍ Scribed by Noemí Andrade-López; Rocío Cartas-Rosado; Efrén García-Baéz; Rosalinda Contreras; Hugo Tlahuext

Publisher
John Wiley and Sons
Year
1998
Tongue
English
Weight
348 KB
Volume
9
Category
Article
ISSN
1042-7163

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✦ Synopsis

adducts 11 and 12 derived from compounds 1 and 2, respectively, and the dihydride-(2-guanidinobenzimidazole-N,NЈ)borate 13 and dihydride-(2-guanidino-1methyl-benzimidazole-N,NЈ)borate 14 were observed by 11 B NMR. The results show that 2-guanidinobenzimidazole gives stable borate heterocycles with a delocalized p electronic system. A dynamic exchange of N-H protons was observed with preferred protonation at N-12. The new heterocycles are protonated at N-10 by acidic substances to give pyridinium-type heterocycles or can lose a proton to give iminium salts.

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