The reaction of an aromatic heterocycle with a proton is called a protonation. One of articles about this theory is 《Phosphines and phosphine sulfides containing highly condensed aromatic groups》. Authors are Tefteller, Wilburn Jr.; Zingaro, Ralph A.; Isbell, A. F..The article about the compound:Tri(naphthalen-1-yl)phosphinecas:3411-48-1,SMILESS:C1=CC2=C(C=C1)C(=CC=C2)P(C1=CC=CC2=C1C=CC=C2)C1=CC=CC2=C1C=CC=C2).Synthetic Route of C30H21P. Through the article, more information about this compound (cas:3411-48-1) is conveyed.
The preparation and properties of 4 new phosphines and 6 new phosphine sulfides are reported. Preparation of the phosphines is accomplished by condensation of a P trihalide, or substituted halide with the aryllithium compound in an inert atm. The sulfides are prepared by refluxing the phosphine with S in an appropriate solvent. The phosphines and sulfides are colorless solids.
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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