Preparation of primary aralkyl urethanes and ureas and...

Details Preparation of primary aralkyl urethanes and ureas and... Preparation of primary aralkyl urethanes and ureas and...

C - Chemistry, Metallurgy

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C

402/122, 260/324

C07C 265/14 (2006.01) C07C 271/08 (2006.01) C08G 18/70 (2006.01) C08G 18/75 (2006.01) C08G 18/76 (2006.01)

Patent

CA 1320955

29,774 PREPARATION OF PRIMARY ARALKYL URETHANES AND UREAS AND ISOCYANATES DERIVED THEREFROM ABSTRACT A process is disclosed for the preparation of aralkyl mono-and diurethanes or ureas by carbamylmethylation, or acid-catalyzed addition at a temperature of 40°C to about 100°C of formaldehyde and esters of carbamic acid to aromatic hydrocarbons. Aralkyl carbamates and ureas formed by this process can be cracked directly to produce aralkyl diiso- cyanates, or hydrogenated and then cracked to produce ali- phatic diisocyanates, or reacted directly with polyols to produce polyurethanes by functioning as blocked isocyanates.

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