Formic Acid → Dibenzo[b,f]thiepin-3-carboxaldehyde 5,5-dioxide

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Reaction Steps

Mix 267 mg (1 mmole) 3-cyano-dibenzo[b,f]thiepin-5,5-dioxide with Raney allowy (500 mg) and a mixture of 4 ml formic acid and 1 ml water at the reflux temperature. After 3 hours, add 200 mg additional Raney alloy and heat for one hour to obtain complete reduction. Filter the reaction mixture while hot to remove the alloy, and wash with ethyl acetate to remove any occluded solvent. Wash the organic layer containing the product with water and with saturated sodium chloride solution. Separate the organic layer containing the product to produce a residue of a pale yellow oil, which crystallizes in a small volume of ethyl acetate, m.p. 167°-171° C.

Provenance & Evidence