Method for producing .alpha.,.alpha.-dimethyl-.DELTA.-valerolactone
AssigneeNitto Chemical Industry Co., Ltd.
InventorsTakeshi Inagaki, Tuyoshi Irie, Katsumi Nakamura, Denzi Sato
Life of this patent
Estimating the term…
Abstract
A method for producing .alpha.,.alpha.-dimethyl-.delta.-valerolactone which comprises carrying out the addition reaction of hydrogen bromide and 2,2-dimethyl-4-pentenoic acid in the presence or absence of a catalyst to synthesize 2,2-dimethyl-5-bromovaleric acid which is then subjected to ring-closure reaction by alkali treatment.
Claims7
A method for producing .alpha.,.alpha.-dimethyl-.delta.-valerolactone which comprises adding 2,2-dimethyl-4-pentenoic acid to an organic solvent containing hydrogen bromide previously dissolved to carry out the addition reaction of hydrogen bromide and said acid to synthesize 2,2-dimethyl-5-bromovaleric acid, and subjcting 2,2-dimethyl-5-bromovaleric acid to ring-closure reaction by alkali treatment.
A method for producing .alpha.,.alpha.-dimethyl-.delta.-valerolactone according to claim 5, wherein the amount of the organic solvent for dissolving hydrogen bromide is 8 to 20 times by weight based on 2,2-dimethyl-4-pentenoic acid.
Dependencies are inferred from the claim text.