Terminal Conjugated Trienal Acetal Compound and Method for Producing Terminal Conjugated Trienal Compound Using the Same

A method for producing a (Z,E)-terminal conjugated trienal acetal compound, the method comprising the step of:

• reacting a phosphonium salt represented by General Formula (7):
• wherein n is an integer of 2 to 11;
• each of R1 and R2 independently represents a monovalent hydrocarbon group having 1 to 10 carbon atoms, or R1 and R2 are bonded to each other to form a divalent hydrocarbon group having 2 to 10 carbon atoms as R1-R2;
• and X represents a halogen atom,
• with (E)-2,4-pentadienal through a Wittig reaction to obtain a (Z,E)-terminal conjugated trienal acetal compound represented by General Formula (3):

A method for producing a terminal conjugated trienal compound, the method comprising the step of:

• deprotecting a terminal conjugated trienal acetal compound represented by General Formula (1):
• wherein n is an integer of 2 to 11;
• and each of R1 and R2 independently represents a monovalent hydrocarbon group having 1 to 10 carbon atoms, or R1 and R2 are bonded to each other to form a divalent hydrocarbon group having 2 to 10 carbon atoms as R1-R2,
• to obtain a terminal conjugated trienal compound represented by General Formula (2):
• H2C═CH—CH═CH—CH═CH—(CH2)n—CHO (2).