Ultrasonics Sonochemistry
Volume 14, Issue 5, July 2007, Pages 497-501
A green synthesis of isatoic anhydrides from isatins with urea–hydrogen peroxide complex and ultrasound
Todor Deligeorgieva, Aleksey Vasileva, Juan J. Vaquerob and Julio Alvarez-Builla
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http://dx.doi.org/doi:10.1016/j.ultsonch.2006.12.003