co 2 ph co 2 n succinimidyl c ome 3 c oet 2 con och 3 ch 3 cho ch 2 oh or c ch 3 2 oh and r 4 is which comprises the step of microwave irradiating a mixture comprising a compound of the formula ii in further embodiment the invention is directed to a process for the preparation of a compound of the formula vi is an insoluble solid support selected from the group consisting of poly styrene divinylbenzene macroreticular poly styrene divinylbenzene polystyrene which is radiation grafted to polypropylene polystyrene which is radiation grafted to polyethylene polystyrene which is radiation grafted to poly tetrafluoroethylene and polystyrene which is radiation grafted to poly ethylene tetrafluoroethylene wherein the insoluble solid support is in a shape selected from a bead a tube a rod a ring a disk or a well l is u2014 ch 2 u2014 u2014 c ch 3 2 u2014 u2014 ch ch 3 u2014 u2014 ch 2 n ch cn u2014 u2014 ch 2 n ch c0 2 me u2014 ch 2 n ch ph u2014 ch 2 n c ch 3 ph u2014 ch ch 2 ch 2 ph or n is zero or an integer from 1 to 5 m is zero or an integer from 1 to 100 w is an integer from 1 to 10 p is zero or an integer from 1 to 10 b is mmol content of initiator or solid supported polymer per gram of insoluble solid support and is about 0 1 to about 5 0 mmol per gram r 1 is selected from x is h f ch 2.