Acetic Acid → 22703-30-6

Participants

Reaction Steps

A mixture of 9.43 grams of 1-hydroxy-3,5-dimethylcyclohexane carboxylic acid ethyl ester with 4.38 grams of guanidine hydrochloride and 2.59 grams of potassium hydroxide pellets in 52 ml of ethanol is refluxed for 1 hour. The solution is cooled, diluted with 172 ml of water and brought to pH 7 with glacial acetic acid resulting in a white precipitate being formed. After refrigeration at 5° C for 3 hours, the crystals are filtered, washed with water and ether, and dried yielding 3.20 grams of 2-amino-7,9-dimethyl-1-oxa-3-aza-spiro[4,5]dec-2-en-4-one, having a melting point of 276°-81° C.

Provenance & Evidence