Abstract
ABSTRACTA series of new azo-linked xanthene derivatives was synthesized via the eco-friendly multi-component condensation of azo-linked salicylaldehyde derivatives and dimedone under ultrasound irradiation as green energy source in the presence of TiO2 nanotubes (TNTs) as suitable heterogeneous catalyst. TNTs have moderate surface areas (SBET = 238 m2.g−1) and high physiochemical stability ( > 250°C). The yield of 74–87% was achieved within 10 min at room temperature. The current method has advantages such as the simple experimental procedure, green conditions, utilization of reusable TiO2 nanotubes catalyst, and good to excellent yield of products.
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