摘要：

In a method for prepg. oligomers of monomers which include members having common functionalities for condensation, but otherwise differing as to compsn., in which (1) the oligomers are prepd. by sequential addn. of terminally blocked monomers, the monomers having one or more reactive functionalities joined to protective gps., while the growing chain is bound to a support, (2) terminal blocking gps. are removed and the next monomer added and (3) after the final monomer addn., the terminal blocking gp. is cleaved from the support, the improvement comprises (a) prior to each sequential addn., capping terminal gps. which are not blocked with a selectively removable capping gp., (b) after the last monomer addn., removing capping gps. and any enzymatic hydrolysis interfering protecting gps. and (c) enzymatically hydrolysing oligomers lacking a terminal blocking gp., prior to removal of terminal blocking gps.

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