Among the many kinds of clay minerals, montmorillonite has been most often used in organic chemical applications. The use of acid activated montmorillonite clays as catalyst in organic synthesis was briefly reviewed. The use of the commercial bleaching clay as a catalyst was investigated. Dimethyl 4,4\' -diphenylmethane dicarbamate and polymethylene polyphenyl carbamate homologues were prepared by the bleaching clay catalyzed condensation of an methyl N-phenylcarbamate with a methylenation agent, such as formaldehyde or trioxane. The influence of the catalyst used, the ratio of the catalyst to methyl N-phenylcarbamate, the molar ratio of methyl-N-phenylcarbamate to the methylenation agent, temperature and reaction time on yields of dimethyl 4,4\' - diphenylmethane dicarbamate was examined. The condensation products were analyzed by high-performance liquid chromatography on reversed phases (RP-HPLC).The bleaching clay can be used as an efficient catalyst of condensation of methyl-N-phenylcarbamate with formaldehyde.