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dimethyldiphenyl diisocyanate (todi), also known as 3,3′-dimethyl-4,4′-biphenyl diisocyanate and ortho-toluene diisocyanate, has a molecular formula of c16h12n2o2 and is an organic chemical raw material. todi appears as a colorless crystalline solid with no special odor. it is soluble in carbon tetrachloride, acetone, chlorobenzene, nitrobenzene, benzene and kerosene, and is insoluble in water. todi is widely…