Journal
ULTRASONICS SONOCHEMISTRY
Volume 15, Issue 4, Pages 456-462Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/j.ultsonch.2007.09.010
Keywords
amines; DDQ; indoles; thiocyanation; sonochemistry; ultrasound
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Thiocyanation of various aromatic and heteroaromatic compounds has been achieved in the presence of ammonium thiocyanate (NH4SCN) and 2.3-dichloro-5,6-dicyano-1,4-betizoquinone (DDQ) in methanol solution under ultrasound irradiation. An ultrasonic probe of 24 kHz frequency has been used for this study. Whereas the use of ultrasound increases the rate of reactions compared with reactions at reflux conditions, the electron-donor ability of aromatic nucleus enhances also the rate of reaction. (c) 2007 Published by Elsevier B.V.
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