Patent ID: 6069278
Filing Date: 2000-05-30
Classification: C07C,C08G

Abstract:
A process of preparing an aromatic diamine which comprises converting a substituted biphenyl having the formula: ##STR19## where X is halogen in the presence of sodium nitrite and an acid to the corresponding dihydroxy-substituted biphenyl having the formula: ##STR20## reacting the dihydroxy-substituted biphenyl with an aryl reactant having the formula: ##STR21## where X is halogen to obtain the corresponding substituted phenoxy biphenyl having the formula ##STR22## and subsequently converting the substituted-biphenyl in the presence of hydrogen to the corresponding aromatic diamine having the formula: ##STR23## wherein A is a radical selected from the Group consisting of --CF.sub.3, aryl, halogen, --OR where R is an alkyl, aryl or substituted aryl radical of 1 to 8 carbons, and --OCX.sub.3 where X is halogen and B is a radical selected from the Group consisting of hydrogen, an alkyl radical of 1 to 4 carbons, --CF.sub.3, aryl, halogen, --OR where R is an alkyl, aryl or substituted aryl radical of 1 to 8 carbons, and --OCX.sub.3 where X is a halogen.