| abstract |
PURPOSE: To prepare the titled compound useful as perfume, etc., by using a novel ether obtained economically from prenyl halide, prenol, etc., and heating the ether in the presence of a 0-valent Pd complex and if necessary an alkali metal salt of an aliphatic monocarboxylic acid. n CONSTITUTION: Citral or isolavandulyl aldehyde can be prepared by the thermal reaction of the novel ether of formula I [R 1 and R 2 are H or methyl; A is group of formula II (Z is halogen or acyloxy) or formula III] in the presence of a 0- valent Pd complex [e.g. Pd[P(C 6 H 5 ) 3 ] 4 , etc.], if necessary in the copresence of an alkali metal salt of a lower aliphatic monocarboxylic acid (e.g. lithium acetate) at about 100W200°C. The compound of formula VI (X 2 is X 1 or Cl) which is one of the starting compounds of formula I can be obtained e.g. by reacting the ether of formula IV with the tert-butyl hypohalite of formula V (X 1 is halogen). n COPYRIGHT: (C)1984,JPO&Japio |