Patent ID: 8501979

Claim:
A process for preparing a compound, the process comprising preparing the compound to have a general formula I (NC) x —R 1 (CN) y (1) in which: R 1 represents a saturated or unsaturated, linear or branched hydrocarbon group containing 1 to 20 carbon atoms and optionally containing hetero-atoms, x and y are 0 or 1, with (x+y) being 1 or 2, by reacting ammoniac with a compound of general formula II (H 4 NOOC) x —(R 1 )—(COONH) y in vapour phase in the presence of a catalyst comprising a silicon ortho phosphate of formula Si 3 (PO 4 ) 4 , at a temperature of between 300° C. and 450° C.