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Dipolaraprotic solvent

The cyclical oligomers of phenolphthalein of polyarylenestersulfonek-etone can be produced [412] by cyclical depol3Tnerization of corresponding polymers in dipolaraprotic solvent (dimethylformamide), dimethylac-etate in the presence of CsF as catalyst. [Pg.168]

See also in sourсe #XX -- [ Pg.160 ]



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