620-91-7

Usage

Uses

N1,N4-Di-p-tolylbenzene-1,4-diamine is a useful intermediate for the preparation of some chemically active substances for polymeric materials.

Upstream product

• 106-49-0 p-toluidine 
• 122-37-2 4-anilinophenol 
• 123-31-9 hydroquinone 
• 18440-54-5 N-(4-Methylphenyl)-1,4-benzoquinone monoimine 
• 5435-44-9 (E)-3-Ureido-but-2-enoic acid ethyl ester 
• 29813-87-4 N-(4-hydroxyphenyl)-p-toluidine 
• 95-53-4 o-toluidine 
• 106-37-6 1.4-dibromobenzene 
• 106-39-8 bromochlorobenzene 

Downstream Products

• 111271-50-2 [1,4]benzoquinone-bis-p-tolylimine 
• 255883-38-6 C₅₂H₄₄N₄ 
• 1094843-55-6 N₁-(4-((6-(di-(p-tolyl)amino)pyren-1-yl)(p-tolyl)amino)phenyl)-N₁,N₆,N₆-tri-(p-tolyl)pyrene-1,6-diamine 

Relevant academic research and scientific papers

Stable nickel(0) phosphites as catalysts for C-N cross-coupling reactions

Herein we describe the design and preparation of inexpensive, air-stable nickel phosphite-based catalysts for use in the C-N cross-coupling reaction. The combination of nickel tetrakis(triphenyl phosphite) {Ni[P(OPh) 3]4} and 1,1'-bis(diphenylphosphino)ferrocene (dppf), and in particular a newly developed catalyst (dppf)Ni[P(OPh)3] 2, were found to be extremely effective in catalyzing a range of amination reactions of anilines and amines with aryl chlorides. This new catalyst system offers an alternative to the bis(cyclooctadienyl)nickel [Ni(COD)2] and palladium(0) catalysts commonly used for C-N bond formation.

Tetraazacyclophanes by palladium-catalyzed aromatic amination. Geometrically defined, stable, high-spin diradicals

matrix presented R = R′ =p-Me R = R′ = m-OMe R = R′ = p-OMe R = CO2t-Bu, R′ = p-OMe R = R′ = CO2t-Bu Neutral tetraazacyclophanes were prepared in a one-step palladium-catalyzed amination reaction. Simple oxidation of these materials

Easily transportable and meterable mixtures of aromatic oils and phenylenediamines having high stability in storage

This invention relates to easily conveyable and easily meterable mixtures having high stability in storage, containing aromatic mineral oils and phenylenediamines, the content of phenylenediamines in the mixture being 1 to 99 wt. %. The mixtures of mineral oils and phenylenediamines according to the invention are used in the production of rubbers and rubber articles.

Para-aminophenol derivatives

A process for the preparation of diaryl para-phenylenediamines from a crude para-aminophenol solution such as obtained by the catalytic hydrogenation of nitrobenzene in an aqueous acid reaction medium. The process comprises contacting the para-aminophenol containing acidic solution, after neutralization with ammonia, with an aromatic amine selected from the group consisting of aniline, mixed toluidines, ortho-toluidine, mixed xylidines, and mixtures thereof under conditions whereby the aromatic amine extracts the para-aminophenol from the crude feed solution and is separated therefrom. The separated solution comprised essentially of the aromatic amine extractant, para-aminophenol, and minor amounts of impurities is then contacted with an alkylation catalyst to produce the diaryl para-phenylenediamines.

Recovery of para-aminophenol

An improved method for the recovery of para-aminophenol from crude solutions thereof such as obtained by the catalytic hydrogenation of nitrobenzene in an aqueous acid reaction medium. The method comprises neutralizing the cold, acidic solution containing the crude para-aminophenol whereby a very fine fluffy para-aminophenol precipitates. When an aromatic amine selected from the group consisting of aniline, mixed toluidines, ortho-toluidine, mixed xylidines, and mixtures thereof is admixed therewith an upper layer containing the para-aminophenol suspended in the aromatic amine forms when allowed to settle. A clear lower layer containing about 70 to 90% of the ammonium sulfate solution is separated and discarded. The upper layer which contains the aromatic amine and the para-aminophenol can be used as a source of para-aminophenol for producing para-aminophenol derivatives such as diaryl para-phenylenediamines.