178400-99-2Relevant academic research and scientific papers
Process for manufacturing diphenylamines
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Page/Page column 6; 9, (2008/06/13)
The invention teaches novel process steps for the rapid high yield manufacture of diphenylamines of the formula wherein R1 is selected from hydrogen, alkyl, and aryl; wherein each R2 and R3 is the same or different and each is independently selected from hydrogen, alkyl, alkoxy, aralkyl, dialkylamino, alkylarylamino and substituted or unsubstituted aryl, the substituents on aryl being each independently selected from alkyl (C1-C8), alkoxy (C1-C8), aroxy, aralkoxy and halogen; wherein n and m are each independently an integer from 1 to 5. Diphenylamines 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.
Fluoran compounds, intermediates and color forming recording materials
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, (2008/06/13)
By using the fluoran compound represented by the following general formula (I); STR1 wherein R1 is alkyl containing 1 to 4 carbon atoms, R3 is alkyl containing 1 to 8 carbon atoms, R4 is hydrogen or alkyl containing 1 to 8 carbon atoms, or R3 and R4 may bond with each other to form a ring together with a N atom, R2 is alkyl containing 1 to 4 carbon atoms, and n denotes 0, 1 or 2, however, the substituents represented by R2 may be different with each other when n is 2, as a color former for color forming recording materials, recording materials which have excellent properties in whiteness of the background of the material under light and in photostability of color-formed images on the materials as well as in sufficient color forming capability of the material even after having exposed them to light, can be provided.
