Chloroacetaldehyde → 4,5,6,7-Tetrahydro-1-benzofuran-4-one

To 5 ml of water were added 1.12 g (10 mmoles) of 1,3-cyclohexanedione and the each base shown in Table 1, and then 2 ml of 40% aqueous solution of chloroacetaldehyde was added thereto. The resulting mixture was stirred at a room temperature for 2 hours. To the reaction mixture was added about 10 ml of ethyl acetate, and then the reaction mixture was acidified with 0.5 to 1 ml of sulfuric acid and stirred for 30 minutes. The resulting ethyl acetate layer was analyzed by gas-liquid chromatography (hereinafter referred to as "GLC") (SE30 10%, 1.2 m×3 mmφ glass column, 130° C.) using p-dimethoxybenzene as an internal standard. The obtained each result is shown in Table 1. It was proved from the results of the GLC that 4-oxo-4,5,6,7-tetrahydrobenzofuran was produced in a yield shown in Table 1, in each Example. Comparative Example 1 was carried out in the absence of a base.

1. stirringstirred for 30 minutes
2. customThe obtained each result

ORD-Eintrag

ord-3d6d9c01c819446c93de8dd1e55e5360

Quelldatensatz

uspto-grants-1985_12

DOI

10.6084/m9.figshare.5104873.v1

Patentnummer

US04558143