There is a growing interest in recycling of post-consumer poly(ethylene terephthalate) (PET) waste for both environmental and economic reasons. PET in the form of disposable soft drink bottle waste was subjected to depolymerization via aminolysis using excess of 3-amino-1-propanol under soxhlet by conventional heating as well as microwave irradiation using catalyst sodium acetate or potassium sulfate. The product obtained was characterized after purification by using melting point, IR spectroscopy, nuclear magnetic resonance, and differential scanning calorimeter and was found to be bis-(3-hydroxy propyl) terephthalamide (BHPTA). The BHPTA thus obtained was subjected to cyclization reaction using thionyl chloride to obtain bis-oxazin under conditions of ambient temperature. Bis-oxazin has applications in polymer synthesis as a chain extender or a cross linking agent.

A series of novel dihydropyrimidin-2(1H)-ones derivatives was synthesized by using Rhizopus Oryzae lipase biocatalyst in deep eutectic solvent. The reaction is characterized by high efficiency and selectivity, short reaction time, mild and environmentally friendly reaction conditions. The yields were found to be significantly higher and reuse of both the lipase and deep eutectic solvent was possible up to four consecutive cycles. The products are found to exhibit appreciable in vitro antibacterial activity against Echerichia coli, Pseudomonas neumoniae and in vitro antifungal activity against Aspergillus niger and Candida albicans.

A simple and environmentally friendly reaction has been developed for the first time for onepot synthesis of β-amino alcohol derivatives from aromatic phenols, epichlorohydrin and amines by using phase transfer catalysts (PTC) and Aspergillus Oryzae lipase biocatalyst. This method provides access to pharmaceutically relevant products in excellent yields with high regioselectivity. The remarkable catalytic activity and reusability of lipase was possible up to four consecutive cycles.

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Phosphine-Free Copper-Mediated Sonogashira Coupling Reaction. -A polystyrene-supported Cu complex is used as catalyst for the coupling reaction of aryl iodides with terminal alkynes. The catalyst can be recovered and reused three times without loss of activity. -(BORUDE, V. S.; SHAH, R. V.; SHUKLA*, S. R.; Monatsh.