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 20, No. 4, 1983, pp.551-556
Published online, 1st January, 1970
DOI: 10.3987/R-1983-04-0551
Competitive Formation of Pyrrole and Pyridazine Ring: Stable Tetrahydropyridazine Carbinolamine as Common Precursor

Leopoldo Ceraulo, Liliana Lamartina, Onofrio Migliara, Salvatore Petruso, and Vincenzo Spiro

*Instituto di Chimica Farmaceutica e Tossicologica, Università digli Studi di Palermo, Via Archirafi 32, 90123 Palermo, Italy


It is demonstrated, by 13C-nmr analysis, that the precursors of both imidazo[1,5-b]pyridazines 3a-c and 1-ureidopyrroles 4d-f have the tetrahydropyridazine structure 2a-f, rather than the previously reported semicarbazone one 1a-f.