Synthesis, structure, and physico-chemical properties of 3-methyl and 3,3-dimethyl derivatives of 1-(4',4'-dimethyl-2',6'-dioxocyclohex-1'-yl)-3,4-dihydroisoquinoline

Article abstract of DOI:10.1007/BF00697079

3,3-Dimethyl- and 3-methyl-1-(4',4'-dimethyl-2',6'-dioxocyclohex-1'-yl)-3,4-dihydroisoquinolines have been synthesized.Crystal and molecular structures of the 3,3-dimethyl derivative have been determined.In the crystalline state this compound exists as a tautomeric form where a hydrogen atom is located at the N atom of the dihydroisoquinoline fragment of the molecule.The tautomeric equilibrium does not shift noticeably in solutions, as shown by IR, UV, and NMR spectroscopy.