Method for producing 2,4-dienal acetal compound and 2,4-dienal compound

A method for producing a 2,4-dienal compound of Formula (3):

• R1CH═CH—CH═CH—CHO (3),
• comprising steps of:
• subjecting a 2-enal acetal compound having a leaving group X at position C5 and being expressed by Formula (1):
• R1CHX—CH2—CH═CH—CH(OR2)(OR3) (1),
• wherein R1 stands for a hydrogen atom or a substituted or unsubstituted monovalent hydrocarbon group having from 1 to 13 carbon atoms, R2 and R3 each independently stands for a monovalent hydrocarbon group having from 1 to 10 carbon atoms or R2 and R3 are joined together to form, as R2-R3, a divalent hydrocarbon group having from 2 to 10 carbon atoms, X stands for a leaving group which is an alkoxy group having from 1 to 12 carbon atoms, an acyloxy group having from 1 to 10 carbon atoms, a silyloxy group having from 3 to 20 carbon atoms, an alkanesulfonyloxy group having from 1 to 10 carbon atoms, an arenesulfonyloxy group having from 6 to 20 carbon atoms, or a halogen atom,
• to an elimination reaction in the presence of a base obtain a 2,4-dienal acetal compound of Formula (2):
• R1CH═CH—CH═CH—CH(OR2)(OR3) (2);
• and
• deprotecting the 2,4-dienal acetal compound (2) to obtain the 2,4-dienal compound (3).