155310-23-9Relevant articles and documents
Emissive monomeric metal complexes
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Page/Page column 4-5, (2010/11/30)
Monomeric metal complexes having improved luminescence properties are provided. In one embodiment, a monomeric metal complex is represented by the formula [PN]M(L)2. PN is an amidophosphine ligand, and M may be any metal capable of exhibiting l
Process for producing diphenylamines or N,N'-diphenyl-phenylenediamines
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, (2008/06/13)
Diphenylamines or N,N'-diphenyl-phenylenediamines can be obtained by heat-reacting an aniline or a phenylenediamine with preferably an excess of a phenol in an amount of 4 to 20 moles per mole of the aniline or phenylenediamine in the presence of a hydrogen transfer catalyst and a cyclohexanone corresponding to said phenol. The excess phenol used in the reaction undergoes reduction in the reaction system to form a cyclohexanone, which in turn reacts with the aniline or phenylenediamine to form a Schiff base and is thus consumed. The Schiff base forms the intended product by means of a dehydrogenation reaction, and the hydrogen evolved at this time reduces the phenol to form a cyclohexanone. The phenol present in excess thus becomes in the system a solvent, a starting material for the cyclohexanone, and an acceptor of the hydrogen that forms as a by-product at the time of formation of the intended product. Hence, it becomes possible to obtain the intended product at a high selectivity from the anilines and phenylenediamines. The process of this invention is an advantageous process for the industrial production of especially the nuclearly substituted diphenylamines.