1,1'-(Diazomethylene)bis(benzene) → HCID 54065091, compound

Participants

Reaction Steps

To a solution of 2-allyloxyimino-2-(5-amino-1,2,4-thiadiazol-3-yl)acetic acid (syn isomer) (10 g) in tetrahydrofuran (230 ml) was added portionwise diphenyldiazomethane (12.76 g) under cooling in an ice bath and stirring and the mixture was stirred for 2 hours at room temperature. The resulting mixture was concentrated under reduced pressure until an crystallization began and stood overnight at room temperature. The precipitates were collected by filtration, washed with ethyl acetate and dried to give diphenylmethyl 2-allyloxyimino-2-(5-amino-1,2,4-thiadiazol-3-yl)acetate (syn isomer) (5.41 g), mp. 175° to 180° C. (dec.). The filtrate and the washings were combined and evaporated to dryness. The residue was crystallized from methylene chloride-diethyl ether (4:1) to give further crops of the object compound (6.7 g), which was recrystallized from acetonitrile.

Provenance & Evidence