Tetrahydroacridine-1,8-(2H,5H,9H,10H)-diones 4 from 1,3-cyclohexanedione and/or dimedone 1,2-chloro-3-formylquinoline 2 and anilines 3 in water at 90 °C were obtained by domino reaction approach.

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Water Mediated Reactions: TiO 2 and ZnO Nanoparticle Catalyzed Multi Component Domino Reaction in the Synthesis of Tetrahydroacridinediones, Acridindiones, Xanthenones and Xanthenes. -The new methodology offers a domino reaction strategy, high yield, simple operation, recyclability, and is eco-friendly. In addition, a productive, highly chemoselective ZnO-catalyzed, water mediated, microwave aided synthesis of functionalized xanthenes and xanthenones (X) and acridinediones (XI) and (XII) in high yields is reported through an environmentally benign strategy. -(PUGAZHENTHI, I.; GHOUSE, S. M.; NAWAZ KHAN*, F.-R.; JEONG, E. D.; BAE, J. S.; KIM, J.-P.; CHUNG, E. H.; KUMAR, Y. S.; DASARADHAN, C.; RSC Adv. 5 (2015) 22, 17257-17268, http://dx.doi.org/10.1039/C4RA13045F ; Div. Org. Chem., Vellore Inst. Technol., VIT Univ., Vellore 632 014, Tamil Nadu, India; Eng.) -M. Bohle 28-067

Mild steel materials have wide applications in marine construction, because they are low cost, available and easy to handle. However, they have to be protected from corrosive media by coating with polymer hybrid materials. This paper focuses on the anticorrosive properties of poly(4-methyl-5-vinylthiazole) PVTZ coatings on mild steel. Further the coating resistance is enhanced by incorporating Titania Nano particles (TiO2NPs). The nanoparticles were evaluated using X-ray diffraction studies (XRD) and transmission electron microscopy (TEM). PVTZ and its TiO2 nanocomposite were coated on mild steel. Their anticorrosive behavior was analyzed by potentiodynamic polarization and electrochemical impedance spectroscopy in 3.5% (w/v) NaCl.