Butyl isocyanate → 2-Biphenylylsulfonylisocyanate

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23.3 g of 2-biphenylylsulfonamide, 10.9 g of n-butyl isocyanate, a catalytic amount of 1,4-diazabicyclo[2,2,2]-octane and 150 ml of xylene were refluxed with stirring for an hour. Then, a solution of 11.9 g of trichloromethyl chloroformate in 30 ml of xylene was added dropwise over 2.5 hours while maintaining the internal temperature at 120°-125° C. After this addition, the mixture was held at this temperature for a while, and thereafter the mixture was refluxed for a short period to complete the reaction. At the end of the reaction, the xylene and n-butyl isocyanate were distilled off under reduced pressure, to obtain 22.0 g of 2-biphenylylsulfonylisocyanate of high purity. B.pt. 135°-137° C./0.7-0.8 mmHg.

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