Combined phase transfer catalysis and ultrasound to enhance tandem alkylation of azo dyes
X Li, J Wang, R Mason, XR Bu, J Harrison
Index: Li, Xiang; Wang, Jie; Mason, Richard; Bu, Xiu R; Harrison, Joycelyn Tetrahedron, 2002 , vol. 58, # 19 p. 3747 - 3753
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Citation Number: 23
Abstract
Ultrasound has been found to enhance N-substitution against elimination in the reaction of carbazole-containing bromides 3 with a Disperse Orange 3 derivative 2 under PTC condition. Upon using combined PTC and ultrasound conditions, a series of bifunctional molecules 1 have been prepared to possess charge-transporting agents and nonlinear optical chromophores in 2: 1 ratio.
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