Online article for Non-subscribers

Pay per view

Heterocycles has a pay-per-view service for Non-subscribers.
You will be able to directly purchase the full text article through PayPal.
Your purchased Paper can be downloaded after the payment is completed.
An e-mail will be sent the URL to download the paper.
If you have any questions, please contact:

Price: ¥ 4,400 (Yen only)
Period: This Article can be accessed for 7 days.

Communication | Regular issue | Vol 23, No. 9, 1985, pp.2183-2186
Published online, 1st January, 1970
DOI: 10.3987/R-1985-09-2183
Studies in Cycloaddition Reactions: A Novel Synthesis of 1H,9H-1,2,4-Triazolo[4,3-a]benzimidazoles from 1-Acylbenzimidazoles and Hydrazidoyl Chloride

Eltepu Sayanna, Revannuru Venkatachaliah Venkataratnam,* and Gopalakrishna Thyagarajan

*Regional Research Laboratory, Hyderabad 500 007, India


1-Acylbenzimidazoles undergo 1,3-dipolar cycloaddition with nitrileimine to produce derivatives of the 1H,9H-1,2,4-triazolo[4,3-a]benzimidazole system, followed by a rapid in situ substitution at 9a-position by the benzhydrazidoyl moiety. Substituted imidazoles and benzimidazole give 1-benzhydrazidoyl substituted products.