Microwave activation coupled with solvent-free phase transfer catalysis (PTC), as a green chemistry procedure, was applied to the synthesis of new benzylidene cineole derivatives as potential UVA filters. Considerable improvements over classical procedures are put into evidence when using KOH + K2CO3 as the base and TBAB as the phase transfer agent. Comparison with conventional heating in strictly the same conditions as under microwave revealed an important specific non-thermal microwave effect. Preliminary studies to evaluate the photochemical behaviour of these new derivatives were carried out.
Microwave activation and solvent-free phase transfer catalysis for the synthesis of new benzylidene cineole derivatives as potential UV sunscreens
VILLA, CARLA;MARIANI, EMILIA;
2001-01-01
Abstract
Microwave activation coupled with solvent-free phase transfer catalysis (PTC), as a green chemistry procedure, was applied to the synthesis of new benzylidene cineole derivatives as potential UVA filters. Considerable improvements over classical procedures are put into evidence when using KOH + K2CO3 as the base and TBAB as the phase transfer agent. Comparison with conventional heating in strictly the same conditions as under microwave revealed an important specific non-thermal microwave effect. Preliminary studies to evaluate the photochemical behaviour of these new derivatives were carried out.
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