52899-12-4Relevant academic research and scientific papers
The positional and structural izomerization equilibrium of branched pentylbenzenes
Naumkin,Nesterova,Nesterov,Vodenkova,Golovin
experimental part, p. 141 - 148 (2011/08/05)
The equilibrium of the positional and structural isomerization of branched monopentylbenzenes, pentyltoluenes, and pentyl-o-xylenes was studied. It was found that the 1,2-dimethylpropyl substituted derivatives prevail over the 1,1-dimethylpropyl substituted isomers in the equilibrium mixture of all of the examined groups of compounds. The thermodynamic characteristics of the structural isomerization of pentylbenzenes were calculated from the experimental data.
Selective alkylation of xylenes by alcohols on zeolite catalysts
Isakov,Minachev,Kalinin,Isakova
, p. 2763 - 2768 (2007/10/03)
The peculiarities of catalytic performance of crystalline aluminosilicates of different types and compositions (X, Y including dealuminated Y′, mordenite, pentasil ZSM-5), as well as of amorphous aluminosilicate catalyst in conversion of xylene + alcohol mixtures were studied. New data were obtained for alkylation of o-xylene with tert-butyl alcohol, concerning controlling the selectivity and stability of the zeolite catalysts in reactions proceeding with the participation of water, including the water evolved during the reaction, in particular by controlling the acidic properties and hydrophobycity of the zeolites. A catalyst ensuring production of 1,2-dimethyl-4-tert-butylbenzene (DMTBB) with a 94% yield and selectivity of alcohol conversion to the target product of 94-97% was developed. The catalyst can be used as the basis for a high-performance and environmentally safe method for the synthesis of DMTBB. The catalysts developed can be also used for selective alkylation of o-xylene by C3-C5 alcohols and for alkylation of m-xylene by tert-butyl alcohol.
CHLORINATION OF 4-tert-ALKYL-o-XYLENES
Pozdnyakovich, Yu. V.,Borodovitsyn, V. V.,Shein, S. M.
, p. 138 - 141 (2007/10/02)
The chlorination of 4-tert-butyl-o-xylene and tert-amyl-o-xylene with chlorine and sulfuryl chloride leads to the formation of the products from substitution of the hydrogen atoms at positions 3, 5, and 6 and the tert-alkyl groups at position 4 of the benzene ring.
