Patent ID: 7608730

Claim:
A process for the preparation of a platinum (II) complex compound of general formula (I) wherein the conformation of 1,2-diaminocyclohexane is cis, trans-(l) or trans-(d) isomer and R 1 and R 2 combinedly make dicarboxylic acid anion having formulae II, III and IV wherein n is zero or an integer ranging from 1 to 5 and R 3 is H, alkoxy, halo or a nitro group comprising the steps of: i) reacting a compound of formula M 2 PtX 4 wherein X represents thiocyanate or a halogen atom selected from Cl, Br, and I with 1,2-diaminocyclohexane to give a compound of formula (V); ii) reacting the compound of formula (V) of step i), with a source of silver ion selected from a silver compound containing divalent anion in presence of an aliphatic carboxylic acid or an aliphatic or aromatic sulphonic acid to give compound of formula (VI) wherein R is —O—CO—R′ or O—SO 2 —R′, wherein R′ is H, an alkyl or an aryl group; and iii) reacting the compound of formula (VI) of step ii), with a dicarboxylic acid or its salts to give the object platinum (II) complex compound of formula (I).