42044-10-0Relevant academic research and scientific papers
Study of regioselective dialkylation of napthalene in the presence of reusable zeolite catalysts
Smith, Keith,Roberts, Simon D.,El-Hiti, Gamal A.
, p. 1552 - 1559 (2007/10/03)
Highly regioselective dialkylation of naphthalene using various alkylating agents can be achieved over zeolite catalysts. For example, the tert-butylation of naphthalene (1) using tert-butanol in cyclohexane over a dealuminated H-Mordenite (HM) zeolite has been optimised to give a 60% yield of 2,6-di-tert-butylnaphthalene (3) with a 2,6/2,7 ratio of over 50. This has been achieved by varying the reaction time, temperature, solvent, pressure, amount of tert-butanol, solvent and catalyst, Si/Al ratio of the catalyst, and the mode of addition. The zeolites can be easily regenerated by heating and reused.
Cyclohexylation of Naphththalene over Usy Zeolites
Michvocik, Miroslav,Mravec, Dusan,Hronec, Milan,Smieskova, Agata,Hudec, Pavol
, p. 138 - 148 (2007/10/03)
The influence of thermal stabilization of NH4-Y zeolite and modification of USY zeolites with solutions of hydrochloric acid on the cyclohexylation of naphthalene in the liquid phase was studied. Removal of the part of extra-framework aluminium from zeolite structure has a positive effect on both conversion of naphthalene and amount of dicyclohexylnaphthalenes formed. Modification of zeolites leads to an increase in conversion and selectivity of β-substitution in the naphthalene cyclohexylation.
