✦ LIBER ✦

The structure of 2,3,5-trisubstituted 2-pyrrolin-4-ones

✍ Scribed by Jeremiah P. Freeman; Makhluf J. Haddadin

Book ID: 104238054
Publisher: Elsevier Science
Year: 1979
Tongue: French
Weight: 175 KB
Volume: 20
Category: Article
ISSN: 0040-4039
DOI: 10.1016/s0040-4039(01)86719-8

No coin nor oath required. For personal study only.

✦ Synopsis

Compounds previously reported to be 2,3,5_trisubstituted 2pyrrolin-l-ones are shown to have 5,5'-dimeric structures.

Recently, the reduction of 2,4,5-triphenyl-3H-pyrrol-3-one l-oxide (1) with Zn-HOAc was reported' to give 3-hydroxy-2,4,5_triphenylpyrrole "2", (73%), where.

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## Abstract Irradiation (λ =313 nm) of the 4‐pyrrolin‐3‐ones **1a–1c** in acetone‐, 3‐pentanone‐and cyclopentanone solution affords the title compounds **2**, formally __via__ H‐abstrac‐tion by the excited ketone and recombination of the radical pair formed.