In general, if the atoms that make up the ring contain heteroatoms, such rings become heterocycles, and organic compounds containing heterocycles are called heterocyclic compounds. An article called Polymerization of functionalized norbornenes: Trends and reactivity ratios, published in 2003, which mentions a compound: 3411-48-1, Name is Tri(naphthalen-1-yl)phosphine, Molecular C30H21P, Application In Synthesis of Tri(naphthalen-1-yl)phosphine.
The polymerization of functionalized norbornenes by the known Pd(II) polymerization catalyst, R3P-(1,5-cyclooctadiene)Pd(Me)Cl, was examined Steric and electronic effects of various phosphine ligands on the polymerization activity were examined in relation to the norbornene monomers 5-butyl-2-norbornene (Butyl-NB), 5-Et ester-2-norbornene (EtEster-NB) and 5-methylacetate-2-norbornene (MeOAc-NB) and their exo/ endo preference. In all the polymerizations, the exo isomer was preferentially polymerized The Butyl-NB homopolymerization rate was fastest for sterically bulky phosphines while the EtEster-NB and MeOAc-NB homopolymerization rates were fastest for weakly basic triarylphosphines. The rate of polymerization in the copolymerizations of Butyl-NB and EtEster-NB or MeOAc-NB was faster with weakly basic triarylphosphines. Polymerizations with MeOAc-NB were slower than comparable polymerizations with EtEster-NB due to more facile coordination of the carbonyl functionality. This was confirmed by comparing the rate of Butyl-NB polymerization in the copolymerizations and in the presence of the corresponding norbornane. Reactivity ratios the various catalysts were calculated by the sum-of-squares space method.
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Reference:
Chiral nitrogen ligands in late transition metal-catalysed asymmetric synthesis—I. Addressing the problem of ligand lability in rhodium-catalysed hydrosilations,
Nitrogen-Containing Ligands for Asymmetric Homogeneous and Heterogeneous Catalysis