structure, bistributyltin oxide will react with isocyanates to yield carbon dioxide and the bistributylstannyl-NN′-dialkylureas; these ureas will react further with isocyanate giving bistributylstannyl-NN′N″-trialkylbiurets. By reactions of this type, mixed biurets of the composition RHN·CO·NR′·CO·NR″H have been prepared for the first time.
下的温度和结构的合适条件下,bistributyltin
氧化物会与
异氰酸酯产率
二氧化碳和bistributylstannyl-反应NN '-dialkylureas; 这些
脲将与
异氰酸酯给予bistributylstannyl-进一步反应NN ' ñ “-trialkylbiurets。通过这种反应,首次制备了组成为RHN·CO·NR′·CO·NR″ H的混合缩二
脲。