Dicyclohexylcarbodiimide → HCID 178447885, Verbindung

Beteiligte Stoffe

Reaktionsbedingungen

Reaktionsschritte

A suspension of 2.68 g of 4-[trans-4-(1E-propenyl)cyclohexyl]benzoic acid, 1.8 g of 4-cyano-3-fluorophenol and 187 mg of 4-(dimethylamino)pyridine in 25 ml of methylene chloride was cooled to 0° C. and treated while stirring with 3.17 g of N,N'-dicyclohexylcarbodiimide. After stirring at 0° C. for 5 minutes and at room temperature for 3 hours the suspension was filtered and the filtrate was concentrated. Chromatographic purification of the residue on 50 g of basic aluminium oxide with methylene chloride and subsequent crystallization from hexane/ethyl acetate gave 2.67 g of 4-cyano-3-fluorophenyl 4-[trans-4-(1E-propenyl)cyclohexyl]benzoate as colourless crystals; m.p. (C-N) 117.5° C., cl.p. (N--I) 233.1° C.

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