Why do aromatic interactions matter of compound: 7651-82-3

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The reaction of an aromatic heterocycle with a proton is called a protonation. One of articles about this theory is 《Nature of the π-electronic spectra of aromatic compounds. II. Calculation of the three π-π* absorptions of conjugated systems by the Hueckel M.O. method》. Authors are Nishimoto, Kichisuke.The article about the compound:Isoquinolin-6-olcas:7651-82-3,SMILESS:OC1=CC2=C(C=NC=C2)C=C1).Recommanded Product: 7651-82-3. Through the article, more information about this compound (cas:7651-82-3) is conveyed.

cf. CA 61, 3817a; 62, 3907d. The absorption wavelengths,1La, 1Lb, and 1Bb, of CHCH, CH2:CH2, C6H6, PhNH2, PhOH, PhF, C10H8 and its α-NH2, α-OH, and α-F derivatives, anthracene and its α-NH2, α-OH, and α-F derivatives, tetracene, pentacene, phenanthrene and its 1-, 2-, 3-, 4-, and 9-OH derivatives, chrysene, picene, 3,4-benzphenanthrene, benzanthracene, pyrene, C5H5N and its 2-, 3-, and 4-OH derivatives, pyridazine, pyrazine, s-triazine, s-tetrazine, quinoline and its mono-OH substituted derivatives, and isoquinoline and its mono-OH derivatives were determined and calculated, and correlated to the Hueckel mol. orbital (H.M.O.) energies. After a small modification, the relations could be applied fairly well to the calculation of the electronic spectra of the α-substituted hydrocarbons and the N-heterobenzenes. The H.M.O. theory was applicable to the prediction of the 3 π-π* absorptions of conjugated systems. Simple correlation equations (given) were particularly useful for the alternant hydrocarbons and their α-substituted derivatives having an auxochromic group and also for some N-heterocycles. The electronic spectra of these compounds were very similar to those of the parent hydrocarbons. The calculations for the β-substituted derivatives did not give good results, although the agreement between the calculated and observed values was to some extent satisfactory. These discrepancies could be attributed to the complicated configuration interaction scheme between the lower excited configurations of the mol.

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Reference:
Chapter 1 An introduction to palladium catalysis,
Palladium/carbon catalyst regeneration and mechanical application method