Acetic Acid → 3-Methyl-2-oxooct-6-inylphosphonic acid dimethyl ester

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Reaction Steps

At -70° C., 73 ml of a 1.7-molar butyllithium solution in hexane is added dropwise to a solution of 18.6 g of the dimethyl ester of methanephosphonic acid in 280 ml of tetrahydrofuran; the mixture is stirred for 15 minutes and a solution of 10.5 g of 2-methylhept-5-ynoic acid ethyl ester in 48 ml of tetrahydrofuran is gradually added thereto. The mixture is stirred for 4 hours at -70° C., neutralized with acetic acid, and evaporated under vacuum. The distillation of the residue under vacuum at 0.6 torr and 130° C. yields 10.8 g of the title compound as a colorless fluid.

Provenance & Evidence