Self-condensing ring-opening polymerizations SCROP

Almost at the same time, Hedrick et al. published a reaction based on the same concept, where the term self-condensing ring-opening polymerization (SCROP) was introduced. The inimer 4- [2,2-bis(hydroxymethyl)propanoyl]oxy hexano-6-lactone (Scheme 28) was reacted in the presence of a catalytic amount of SnOct2 to yield hyperbranched polyesters. 

SCROP Self-condensing ring-opening polymerization... 

In the late 1990s, Penczek and co-workers described the synthesis of highly branched (star) polymers by reacting oligomeric alcoholates obtained by ring-opening polymerization of ethylene oxide (EO) with various diepoxides. One possible reaction sequence of the reaction is shown in Scheme 1. This approach can be seen as the first self-condensing ROP (SCROP) synthesis (see below) to obtain hyperbranched polymers. 

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