The Influence of Sonication on the Palladium-Catalyzed Dehydrogenation of Tetrahydronaphthalene

Efficient Evolution of Hydrogen from Tetrahydronaphthalene upon Palladium Catalyst Supported on Activated Carbon Fiber

“…2500 within 1 h. It should be cited that Mason et al reported a new dehydrogenation system of 1 using a Pd/C catalyst, in which high-boiling ether solvents were used and sonication was applied to improve the reaction efficiency (TON = ca. 1600 after 7 h) . The present TONs using the simple system are significantly higher than theirs.…”

Ultrasound in synthetic organic chemistry

“…19 The dehydrogenation of tetrahydronaphthalene to naphthalene using 3% Pd/C in digol under the influence of sonication is accelerated by ultrasonic irradiation (Scheme 12). 20 The conventional thermal reaction in digol at 200 °C reached 55% conversion in 6 h (but thereafter reaction ceased) and only 17% reaction was obtained in the same time at the lower temperature of 180 °C. Under sonication at 180 °C the reaction reached completion in 6 h. Pulsed ultrasound (at 50% cycle) was as effective as continuous sonication and even a 10% cycle gave over 80% yield.…”

Ultrasound-assisted selective hydrogenation of C-5 acetylene alcohols with Lindlar catalysts

“…However, there are difficulties associated with the handling of solid catalysts in microfluidic systems, for example mass transfer limitations [9,10] and reactor clogging by catalyst particles [11,12]. These problems require an alternative method of catalyst treatment in a flow reactor and ultrasonic (US) irradiation is a particularly promising technology in this regard [13], because it has been reported to prevent clogging of microreactor channels [12], increase selectivity and activity of heterogeneously catalysed reactions [14][15][16][17].…”