4132-77-8Relevant articles and documents
Selective alkylation of xylenes by alcohols on zeolite catalysts
Isakov,Minachev,Kalinin,Isakova
, p. 2763 - 2768 (1996)
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.
Conversions of allyl ethers in a superbasic medium
Vyglazov,Chuiko,Izotova
, p. 933 - 939 (2007/10/03)
Conversions of alkyl allyl and terpenoid allyl ethers in a superbasic medium (dimethyl sulfoxide-potassium hydroxide) are studied. The ethers with an unbranched alkyl substituent isomerize into propenyl ethers, the ethers with a branched unsaturated substituent decompose to give a hydrocarbon, and diallyl ethers isomerize into allyl vinyl ethers whose Claisen rearrangement gives rise to aldehydes.
Thermal decomposition of 4-hydroxymethyl-2-carene esters
Chuiko,Vyglazov,Tychinskaya
, p. 1300 - 1304 (2007/10/03)
The kinetics of thermal decomposition of 2-caren-4-ylmethyl p-toluenesulfonate to 4-isopropenyl-1-methylbicyclo[4.1.0]hept-2-ene have been studied by 1H NMR spectroscopy. A mechanism is proposed, according to which the decomposition begins as a concerted process; the mechanism changes as p-toluenesulfonic acid accumulates in the mixture, and the process follows a ionic mechanism. Pyrolysis of esters formed by 4-hydroxymethyl-2-carene and boric acid is discussed in terms of the proposed mechanism.