Tetraethyl vinylidene phosphonate → HCID 10000902, compound

Participants

Reaction Steps

1-Diazo-2-butanone (I, PREPARATION 4, 3.1 g) in ether (50 ml) is treated with ethenylidene bisphosphonic acid tetraethyl ester (II, PREPARATION 1, 9.5 g), stirred at 20°-25° overnight, and concentrated. The concentrate is crystallized twice from methylene chloride/SSB to give the title compound, mp 96°-98°; MS (m/e) 398, 261, 233 and 205; IR (mineral oil mull) 3210, 0664, 1265, 1245, 1046, 1024, 997 and 983 cm-1 ; NMR (CDCl3) 6.92, 4.14-4.33, 3.48, 2.82, 1.30-1.36 and 1.12 δ; CMR (CDCl3) 196, 149, 66, 64, 36, 31, 16 and 8 δ.

Provenance & Evidence