Process for manufacturing diphenylamines
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United States of America Patent
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Feb 19, 2009
filing date -
Sep 28, 2005
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Abstract
The invention teaches novel process steps for the rapid high yield manufacture of diphenylamines of the formulaDiphenylamines are key intermediates for the production of leuco dyes used in pressure-sensitive and heat-sensitive imaging systems. The process in at least one embodiment comprises reacting at elevated temperature an aryl halide with an aromatic amine in an organic solvent and aqueous alkaline solution and optionally in some embodiments, phase-transfer agent, followed by addition of catalytic amounts of bis[tri(t-butylphosphine)]palladium at a suitable temperature to rapidly form diphenylamine.
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