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Research Paper | Chemistry | India | Volume 3 Issue 12, December 2014 | Rating: 6.9 / 10
Synthesis of 1,4-bis (benzyloxy)Benzene Under Sonication and a Multi-Site Phase-Transfer Catalyst in Solid-Liquid Condition-Kinetic Aspects
Pachaiyappan Abimannan, Venugopal Rajendran
Abstract: The ultrasound assisted preparation of 1, 4-bis (benzyloxy) benzene from the reaction of benzyl chloride (BC) and hydroquinone was carried out successfully using sodium hydroxide and catalyzed by a multi-site phase-transfer catalyst (MPTC) viz. , 1, 4-dibenzyl-1, 4-diazoniabicyclo [2.2.2] octane dichloride in a solidliquid reaction condition (SL-PTC). Water is only introduced in a trace quantity to the reaction system to avoid a serious hydration of sodium salt of hydroquinone in the reaction. The reaction is greatly enhanced in the solidliquid system, catalyzed by multi-site quaternary ammonium salt (MPTC) and ultrasound irradiation (40 kHz, 300 W) in a batch reactor. The reaction mechanism is proposed and verified by examining the experimental evidence. A kinetic model is proposed in which a pseudo first-order rate law is sufficient to describe all the results.
Keywords: Multi-site phase-transfer catalyst, ultrasound irradiation, solid-liquid reaction, 1, 4-bis benzyloxy benzene, kinetics
Edition: Volume 3 Issue 12, December 2014,
Pages: 332 - 340