A process for preparing formamide compounds of formula wherein: ▪ R 1 and R 2 are each independently a hydrogen atom, an alkyl group, an alkenyl group, an alkynyl group, an aryl group, a heteroaryl group, a heterocycle, a silylated group, a siloxy group, an amino group, an aldimine of formula -N=CHR 6, a ketimine of formula -N=CR 6 R 7, said alkyl, alkenyl, alkynyl, aryl, heteroaryl, heterocycle, silylated, siloxy and amino groups optionally being substituted; or ▪ R 1 and R 2 together with the nitrogen atom to which they are attached form an optionally substituted heterocycle; or ▪ R 1 and R 2 together with the nitrogen atom to which they are attached form a double carbon-nitrogen bond (N=C) leading to an aldimine of formula -N=CHR 6 or to a ketimine of formula -N=CR 6 R 7; and ▪ R 6 and R 7 are each independently a hydrogen atom, an alkyl group, a alkenyl group, an alkynyl group, an aryl group, a heteroaryl group, a heterocycle, a silylated group, a siloxy group, an amino group, said alkyl, alkenyl, alkynyl, aryl, heteroaryl, heterocycle, silylated, siloxy and amino groups optionally being substituted, characterized in that an amine of formula in which R 1 and R 2 are such as defined above is reacted with CO 2 in the presence of catalyst and a silane compound of formula wherein: ▪ R 3, R 4 and R 5 are each independently a hydrogen atom, a halogen atom, a hydroxyl group, an alkyl group, an alkenyl group, an alkynyl group, an alkoxy group, a silylated group, a siloxy group, an aryl group, an amino group, said alkyl, alkenyl, alkynyl, alkoxy, silylated, siloxy, aryl and amino groups optionally being substituted; or ▪ R 5 is such as defined above and R 3 and R 4 together with the silicon atom to which they are attached form an optionally substituted silylated heterocycle. ▪ R 1 and R 2 are each independently a hydrogen atom, an alkyl group, an alkenyl group, an alkynyl group, an aryl group, a heteroaryl group, a heterocycle, a silylated group, a siloxy group, an amino group, an aldimine of formula -N=CHR 6, a ketimine of formula -N=CR 6 R 7, said alkyl, alkenyl, alkynyl, aryl, heteroaryl, heterocycle, silylated, siloxy and amino groups optionally being substituted; or ▪ R 1 and R 2 together with the nitrogen atom to which they are attached form an optionally substituted heterocycle; or ▪ R 1 and R 2 together with the nitrogen atom to which they are attached form a double carbon-nitrogen bond (N=C) leading to an aldimine of formula -N=CHR 6 or to a ketimine of formula -N=CR 6 R 7; and ▪ R 6 and R 7 are each independently a hydrogen atom, an alkyl group, a alkenyl group, an alkynyl group, an aryl group, a heteroaryl group, a heterocycle, a silylated group, a siloxy group, an amino group, said alkyl, alkenyl, alkynyl, aryl, heteroaryl, heterocycle, silylated, siloxy and amino groups optionally being substituted, characterized in that an amine of formula in which R 1 and R 2 are such as defined above is reacted with CO 2 in the presence of catalyst and a silane compound of formula wherein: ▪ R 3, R 4 and R 5 are each independently a hydrogen atom, a halogen atom, a hydroxyl group, an alkyl group, an alkenyl group, an alkynyl group, an alkoxy group, a silylated group, a siloxy group, an aryl group, an amino group, said alkyl, alkenyl, alkynyl, alkoxy, silylated, siloxy, aryl and amino groups optionally being substituted; or ▪ R 5 is such as defined above and R 3 and R 4 together with the silicon atom to which they are attached form an optionally substituted silylated heterocycle.