Controllable branching degree for hyperbranched polymers: cocyclotrimerization of mono-and bifunctional terminal acctylenes

摘要

A set of well-defined, completely soluble polyphenyl derivatives (Samples 1 approx 6 refer to cocyclotrimerization of 1, 8-nonadiyne with 1-octyne (1) or phenylacetylene (2 approx 6) with initial mol ratio of bifunctional to monofunctional moiety equals to 0.8, 1.0, 1.5, 2.0, and 3.0 respectively) has been synthesized with high yield via cocyclotrimerization technique using niobium chlride (V) as catalyst and characterized by IR, ~1H and ~(13)C NMR, DSC, UV, etc.