The scale-up of microwave flow syntheses by recirculation; The chlorine-free preparation of alkyl phenyl-H-phosphinates

The MW flow esterification of phenyl- H -phosphinic acids with alcohols at ca. 150 °C in the presence of 5% of [bmim][PF 6 ] afforded target alkyl phenyl- H -phosphinates with productivity of ca. 6–9 g h −1 by applying a recirculating mode of operation.