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This article is valuable for providing the ethoxylation reaction mechanism(s). But it does not explain polymerizarion. Presumably on the first cycle, Nu is OH-, then on subsequent cycles Nu is the O- group of the polymer generated in the previous cycle? It would be nice to show this figure on the polyethylene glycol page where the reaction is described under "production".Eaberry (talk) 15:09, 11 June 2012 (UTC)[reply]