Addressing the recommendations of the 12 basic lows of green chemistry, the microwave technique was utilized in phosphaMannich, Diels-Alder and inverse Wittig type reactions, moreover under solventless conditions. In the phase transfer catalysed alkylation of CH-acidic compounds, the quaternary onium salts could be substituted by MW irradiation. The effect of chiral phase transfer catalysts was compared on suitable, potentially enantioselective model reactions. Mono-and bidental P-ligands were developed to make available novel platinum complexes that can be useful as catalysts. Finally, esterifications including diesterifications were studied by in situ Fourier Transform IR spectroscopy.Keywords green chemistry · microwave · phase transfer catalysis · Pligands · transition metal complexes · in situ FTIR Acknowledgement