Preparation of 2-methyl-2,4-bis-(4-aminophenyl) pentane


PURPOSE: To obtain advantageously the titled compound useful as an intermediate for a coating compound, etc., having high solvent solubility and a low melting point, by bringing a diamine or its mixture into contact with hydrogen in the presence of an organic solvent and a hydrogenation catalyst in a specific range of temperature. CONSTITUTION: A compound shown by the formulaIor formula II or a mixture of their isomers is brought into contact with hydrogen at 10°C (preferably about room temperature) W150°C in the presence of an organic solvent (e.g., methanol, toluene, ketone, etc.) and a hydrogenation catalyst (preferably Pd catalyst), to give the desired compound shown by the formula III. When the compound shown by the formula III is used instead of common diaminodiphenylmethane, a prepared maleimide has high solvent solubility, is handled easily because of its low melting point, and has improved resin properties. The raw material diamine is a mixture of isomers of p-isopropenylaniline dimers, and advantageously used in the reaction directly. COPYRIGHT: (C)1982,JPO&Japio




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Patent Citations (2)

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    JP-S51136828-ANovember 26, 1976Teijin LtdPlant growth regulator
    JP-S5626849-AMarch 16, 1981Mitsui Toatsu Chem IncP-isopropenylaniline dimer and its preparation

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