Methanol → 3-nitro-5-oxo-6,7,8,9-tetrahydro [5H] benzocycloheptene-7-carbonitrile

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A mixture of 50 g of 3-nitro-8,9-dihydro [5H] benzocycloheptene-5-one, 1200 ml of methanol, 120 ml of tetrahydrofuran, 100 ml of a 10% aqueous potassium carbonate and 50 ml of acetone cyanhydrin under nitrogen was refluxed for an hour in a bath at 90° C. and the mixture was concentrated to about 200 ml under reduced pressure. The mixture was cooled to 20° C. and was extracted with methylene chloride. The organic phase was washed with water, dried and distilled to dryness under reduced pressure. The 58 g of brown oil residue were crystallized from 50 ml of methanol and the mixture was vacuum filtered to obtain 46 g of 3-nitro-5-oxo-6,7,8,9-tetrahydro [5H] benzocycloheptene-7-carbonitrile with a melting point of 107° C. and then 120° C.

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