Spontaneous 1 : 1 copolymerization CO2 with 1,3- and 1,4-bis(N,N-diethylaminoethynyl)benzenes in the absence of a catalyst takes place to afford poly(4-pyrone)s with molecular mass Mn > 10000 and in high yield.
T. Tsuda, H. Hokazono and K. Toyota, J. Chem. Soc., Chem. Commun., 1995, 2417 DOI: 10.1039/C39950002417
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