The benign properties of perfluoro-compounds:The main issues:Fluorous biphasic systems: the compatibility between the fluorous phase and reactants as well as products separation. non-toxicityhigh levels of inertnesshigh thermal stabilitylow-flammability hydrophobicity. the cost (including compatible catalysts)the ‘greenness’ of their manufacturetheir ultimate effect on the environment after disposal.the fluorous phase and the reactants are non-polar, the polarity of the products is relatively high.