4,4'-Diisocyanato-3,3'-dimethyldiphenylmethane

4,4'-二异氰酸基-3,3'-二甲基二苯基甲烷

Also known as: 1,1'-Methylenebis(4-isocyanato-3-methylbenzene), Bis(4-isocyanato-3-methylphenyl)methane, 3,3'-Dimethyl-4,4'-diisocyanatodiphenylmethane, 5,5'-Methylenebis(2-isocyanatotoluene), 3,3'-Dimethyldiphenylmethane-4,4'-diisocyanate, Nacconate 310, Isocyanic acid, ester with di-o-toluenemethane

4,4'-Diisocyanato-3,3'-dimethyldiphenylmethane (CAS 139-25-3) is a compound in the Organic Acids category listed in the Jingsj chemical database. It has the molecular formula C17H14N2O2 and a molecular weight of 278.305 g/mol. It is also known as 1,1'-Methylenebis(4-isocyanato-3-methylbenzene), Bis(4-isocyanato-3-methylphenyl)methane and 3,3'-Dimethyl-4,4'-diisocyanatodiphenylmethane. Key properties include a boiling point of 410.4±45.0 °C at 760 mmHg, a density of 1.1±0.1 g/cm3 and a flash point of 169.5±34.1 °C. No supplier offers are currently listed; request a quote. Record last updated Aug 21, 2026.

CAS No.

139-25-3

Jingsj CID

J-16065-8

Molecular Formula

C₁₇H₁₄N₂O₂

Chinese Name

4,4'-二异氰酸基-3,3'-二甲基二苯基甲烷

Molecular Weight

278.305 g/mol

Category

Organic Acids

Last updated

8/21/2026