4-Oxo-2-pyrrolines Carrying No Substituents on the Ring Carbon: Substituent Effects in the Tautomerism between 4-Oxo-2-pyrrolines and 3-Hydroxypyrroles

Abstract

Syntheses of 4-0x0-2-pyrrolines having no substituents on the ring carbon were accomplished, and the substituent effects governing the tautomerism between hydroxypyrroles and pyrrolinones were investigated in a series of 3-hydroxypyrroles synthesized.4-0x0-2-pyrroline (I) is the smallest of vinylogous lactams.