69094-40-2

Upstream product

• 762-21-0 acetylenedicarboxylic acid diethyl ester 
• 63012-62-4 4,5-dimethylcyclohexa-1,4-diene-1,2-dicarboxylic acid diethyl ester 
• 5680-10-4 4,5-dimethylphthalic acid 
• 57100-45-5 4,5-Dimethyl-cyclohex-4-ene-1,2-dicarboxylic acid diethyl ester 
• 76-09-5 2,3-dimethyl-2,3-butane diol 
• 513-81-5 2,3-dimethyl-buta-1,3-diene 
• 623-91-6 diethyl Fumarate 
• 141-05-9 Diethyl maleate 
• 26620-46-2 4,5-dimethyl-cyclohex-4-ene-1r,2c-dicarboxylic acid diethyl ester 
• 26620-46-2 (1S,2S)-4,5-Dimethyl-cyclohex-4-ene-1,2-dicarboxylic acid diethyl ester 

Downstream Products

• 1373318-35-4 C₅₅H₄₂O 
• 1373318-36-5 C₈₇H₅₈O 
• 1373318-32-1 C₅₇H₄₆O₂ 
• 60070-06-6 1,2-bis(bromomethyl)-4,5-dimethylbenzene 
• 60070-05-5 1,2-bis(hydroxymethyl)-4,5-dimethylbenzene 
• 5680-10-4 4,5-dimethylphthalic acid 
• 89-05-4 1,2,4,5-benzenetetracarboxylic acid 

Relevant academic research and scientific papers

A method of preparing 1,2,4,5-benzenetetracarboxylic acid or trimellitic acid from pinacol

The invention relates to a method of preparing 1,2,4,5-benzenetetracarboxylic acid or trimellitic acid from pinacol. The method includes a first step of selectively dehydrating the pinacol in an acid/ionic liquid catalytic system to generate 2,-3-dimethyl-1,3-butadiene; a second step of subjecting the 2,-3-dimethyl-1,3-butadiene and maleate or acrylate to a D-A cycloaddition/dehydrogenation tandemreaction to generate an aromatic ring product; and a third step of subjecting the aromatic ring product to hydrolysis and oxidation to prepare the 1,2,4,5-benzenetetracarboxylic acid or the trimellitic acid. The catalytic system adopted in the method is green, and can be recycled. The raw material is a biomass-based platform chemical, and is cheap and easily available. All reaction processes aresimple. The pinacol dehydration reaction, the dehydrogenation reaction of a D-A product and an oxidation reaction are high in activity and selectivity. The novel method for preparing the 1,2,4,5-benzenetetracarboxylic acid and the trimellitic acid which are fine chemicals from the pinacol that is a lignocelluloses based platform chemical is provided by the invention.

Sustainable production of pyromellitic acid with pinacol and diethyl maleate

Herein, we report an unprecedented and sustainable route to synthesize pyromellitic acid (PMA), a monomer of polyimide, with pinacol and diethyl maleate which can be derived from lignocellulose. Analogously, a sustainable route to trimellitic acid (TMA) was also developed using pinacol and acrylate as the feedstocks.

Closely stacked oligo(phenylene ethynylene)s: Effect of π-stacking on the electronic properties of conjugated chromophores

In this work, a bicyclo[4.4.1]undecane scaffold is used to hold oligo(phenylene ethynylene) units in a cofacially stacked arrangement along the entire length of the conjugated units. We study the impact that the resulting strong interchain interactions ha

Efficient synthesis of substituted benzenes from 1,3-dienes or 1,4 cyclohexadienes with KMnO4 under mild conditions

Potassium permanganate absorbed on alumina is used to oxidize 1,4- cyclohexadienes to the corresponding aromatic compounds. Intermolecular Diels-Alder reactions followed by dehydrogenation of the products with potassium permanganate supported on alumina gives an efficient two step synthesis of highly substituted aromatic compounds from acyclic precursors.

SYNTHESIS OF 1,2-DISUBSTITUTED BENZENES AND BIPHENYLS FROM PHTHALIC ACIDS THROUGH ELECTROREDUCTION FOLLOWED BY ELECTROCYCLIC REACTIONS WITH ALKYNES

Various substituted 1,2-dihydrophthalic acids were synthesized by electroreduction of phthalic acids in excellent yields.The electrocyclic reaction of 1,2-dihydrophthalic acids or the methyl ester with alkynes gave 1,2-disubstituted benzenes and biphenyls in good yields together with fumaric acid or methyl fumarate.