Dimethyl malonate → 5,5-bis(methoxycarbonyl)-3-methoxy-2E-pentenoic acid methyl ester

Beteiligte Stoffe

Reaktionsbedingungen

Reaktionsschritte

66 g (0.5 mol) of malonic acid dimethyl ester was placed in 250 ml of N,N'-dimethylformamide. 27.8 g (0.5 mol) of sodium methylate was added at 20° C.; 10 minutes later 41.6 g (0.25 mol) of 4-chloro-3-methoxy-2E-butenoic acid methyl ester was added within 5 minutes. It was stirred for 2 hours at 20° C. Then 10.8 g (0.2 mol) of sodium methylate was added once more. After stirring for 15 hours at 20° C. it was distilled off. After working up according to Example (a) 53.8 g (81 percent) of the title compound, with a purity of 98 percent (GC), was obtained. Data for the title compound was:

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