Ethanol → 1-Chloro-5,6-dimethoxy-2,1,3-benzoxatellurazole-N-oxide

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Reaction Steps

3,4-Dimethoxyphenyltellurium trichloride (74 g=0.2 mole) was suspended in glacial acetic acid (200 ml) in a 1500 ml Erlenmeyer flask. Nitric acid (18 g of 70%=0.2 mole) was added gradually to the stirred mixture, which caused formation of a clear, red solution and a mildly exothermic reaction. Stirring was continued for one hour at room temperature, then ethanol (1000 ml) and hypophosphorous acid (24.0 g of 50 weight percent aqueous) were added in order. Over a period of 30 minutes there occurred crystallization of a red solid, which was collected by filtration to give 47.3 g, 68.8% of theory, m.p. 199°-200° C. The material was identical to product isolated by procedure A. Elemental analyses were in agreement with that calculated for the structural formula.

Provenance & Evidence