Malononitrile → 1,4-Diazabicyclo[2.2.2]octane, hydrochloride

Participants

Reaction Steps

In 100 ml of anhydrous tetrahydrofurane under argon at 0° C., 20.27 g (100 mmoles) of 4-styrenesulfonyl chloride CH2═CHC6H4SO2Cl (commercially available from Monomer-Polymer & Dajac Laboratories), 10.42 g (100 mmoles) of malononitrile and 22.44 g (200 mmoles) of DABCO were reacted. After 2 hours at 0° C. and 48 hours at room temperature, the solution was filtered to remove the DABCO hydrochloride formed, and it was treated with 4.24 g of anhydrous lithium chloride (100 mmoles), stored and weighed in a glove box. There is immediately formed a precipitate of DABCO hydrochloride and the reaction mixture was then again filtered after stirring for 6 hours. After evaporation and drying under vacuum during 24 hours at room temperature, 31.16 g of the lithium salt of 4-styrenesulfonylmalononitrile were recovered, with a purity characterized by a proton and carbon RMN higher than 97%.

Provenance & Evidence