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Synthesis of c-PCL from CL: (a) linear PCL and its cyclization via alkene-alkene metathesis [27]; (b) linear PCL and its cyclization via alkyne–alkene metathesis [27]; (c) linear PCL and its cyclization via alkyne–azide click chemistry [27]; (d) linear PCL and its cyclization via azide–alkyne click chemistry [28].
