wherein R1, R2, X and n are as defined in relation to formula (II); thereby producing a compound of the formula (II) wherein R3 is a hydrogen atom; and thereafter if desired nitrating the compound of the formula (II) wherein R3 is a hydrogen atom to yield a compound of the formula (II) wherein R3 is a nitro group; and thereafter if desired reducing the compound of the formula (II) wherein R3 is a