21083-38-5Relevant articles and documents
Benzothiet-2-ones: Synthesis, Reactions, and Comparison with Benzoxet-2-ones and Benzazetin-2-ones
Wentrup, Curt,Bender, Harald,Gross, Gerhard
, p. 3838 - 3847 (1987)
Benzothiet-2-one (5) is obtained as a neat solid, stable below -20 deg C(-45 deg C in solution), by flash vacuum pyrolysis of benzothiophene-2,3-dione (9).Naphthothiet-2-one (21) and naphthothiet-1-one (42) are obtained as stable crystalline solids in near-quantitative yields from the corresponding naphthothiophenediones 20 and 41.Naphthooxet-2-one (31) and naphthoazetin-2-one (36) were generated and observed by IR spectroscopy to be stable below -40 deg C and 0 deg C, respectively.The thietones, oxetones, and azetinones undergo rapid ring-opening reactions with methanol to give the corresponding carboxylic acid esters.They undergo thermal CO elimination with concomitant Wolff-type ring contraction to thioketenes (17, 25, 45), ketenes (30), and nitriles (37), respectively.The di-, oligo-, and polymerization of the thietones has been elucidated.Naphthothiet-1-one (42) reacts with 1-thiocarbonyl-1H-indene (45) to give cycloaddition product 46.Naphthothietones 21 and 42 react with dicyclohexylcarbodiimide to furnish 2-imino-1,3-thiazin-4-one derivatives 47 and 49.
