hydrogen cyanide in 100 ml of toluene was added to 52 2 grams 0 3 moles of toluene 2 4 diisocyanate at 5 u00b0 c after the addition of 4ml of dibutyl tin diacetate the solution remained at 5 u00b0 10 u00b0 c for 4 hours the reaction solution then slowly warmed to room temperature and after an hour a white solid began to form after remaining at room temperature overnight 9 5 grams of a white solid was collected the infrared spectrum of the product exhibited absorption maxima at 3 08 4 40 and 6 0 microns analysis calculated for c 10 h 7 n 3 o 2 c 59 71 h 3 51 n 20 88 found c 59 48 h 3 58 n 20 74 these analyses and infrared spectrum are consistent with the structure of methyl 1 3 phenylene cyanoformamidyl isocyanate the product melted at 128 u00b0 130 u00b0 c with subsequent resolidification which apparently was due to polymerization a solution of 126 grams 0 75 moles of hexamethylene diisocyanate 10 grams of pyridine and 100 grams of toluene was added to a solution of 20 5 grams 0 76 moles of hydrogen cyanide in 159 grams of toluene at 5 u00b0 c in a nitrogen atmosphere the solution was stirred and allowed to slowly warm to room temperature overnight the white product which precipitated was filtered and washed with petroleum ether to remove unreacted diisocyanate which may adhere to the product the dry solid weighed 30 grams and melted at 92 u00b0 127 u00b0 c the infrared spectrum of the product exhibited absorption maxima of 3 09 lt n h 4 45 strong characteristic of isocyanate group.