NEW MATERIAL:An (E) or (Z)-5-substituted-2-phenylthio-2,4-pentadien-4-olide shown by the formula I or formula II (R is phenyl or benzyl which may have substituent group selected from the group consisting of 1W10C alkyl, halogen and lower alkyl group).
EXAMPLE: (E) or (Z)-5-Pheny1-2-phenylthio-2,4-pentadien-4-olide.
USE: A physiologically active compound useful as an antibacterial agent, fungicide, insecticide, etc. in a medical field, agricultural and horticultural field, etc., and useful as an intermediate for synthesis in the same fields.
PREPARATION: A 2-phenylthio-5-hydroxy-5-substituted-2-penten-4-olide shown by the formula III is brought into contact with an organic base catalyst, dehydrated in the molecule, to give a compound shown by the formula I . The compound shown by the formula III is synthesized from lithium salt of 2- phenylthio-2- buten-4-olide and a compound shown by the formula RCHO.
KUMAMOTO TAKANOBU
WATANABE MIKIO
KURIHARA HIROYUKI
