Patent Number: 6,310,255

Title: Process for producing hinokitiol

Abstract: A process for producing hinokitiol which comprises the step of obtaining 1-isopropylcyclopentadiene from cyclopentadiene and an isopropylating agent represented by the general formula R--X wherein R is an isopropyl group and X is a halogen or the like (first step), reacting it with a dihaloketene to obtain a ketene adduct (second step), and decomposing the ketene adduct (third step), said first step comprising the following three steps: a) a preparation step of cyclopentadienyl metal; b) a step of obtaining isopropylcyclopentadiene by isopropylating the cyclopentadienyl metal in an aprotic polar solvent; and c) a step of isomerizing 5-isopropylcyclopentadiene in the product selectively to 1-isopropylcyclopentadiene with heat.

Inventors: Nagato; Yasuhiro (Nobeoka, JP), Shimizu; Katsuya (Nobeoka, JP), Yamamoto; Shinichi (Nobeoka, JP)

Assignee: Asahi Kasei Kabushiki Kaisha

International Classification: C07C 49/717 (20060101); C07C 45/00 (20060101); C07C 45/69 (20060101); C07C 45/42 (20060101); C07C 49/00 (20060101); C07C 049/547 ()

Expiration Date: 10/30/2018