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Tetramethylcyclopropanone and Isopropylidene(dimethyl)thiirane via Photolysis of Reluctant 3,3,5,5‐Tetramethyl‐1‐pyrazolines; Influence of Solvent and Temperature on the Competition between [3+2]‐ and [4+1]‐Photocycloelimination
Author(s) -
Quasit Helmut,
Fuss Andreas
Publication year - 1981
Publication title -
angewandte chemie international edition in english
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 5.831
H-Index - 550
eISSN - 1521-3773
pISSN - 0570-0833
DOI - 10.1002/anie.198102911
Subject(s) - cyclohexane , photodissociation , solvent , chemistry , benzene , photochemistry , deuterium , thiirane , medicinal chemistry , organic chemistry , physics , atomic physics , ring (chemistry)
The photolysis of 1‐pyrazolines of type (1) holds numerous surprises. Thus, irradiation of (1) , X = O, in deuterated benzene, cyclohexane or acctonitrile (1a) gave without filter the products (3) and (4) , whose ratio depends on the conditions. (2a) could be trapped with CD 3 OD. When X = S in (1) , only (5) is formed.