Synthesis, crystalline structure, and spectra of 3,3-dimethyl-1-(3-methyl-1-phenylpyrazol-5-onylidene-4)-1,2,3, 4-tetrahydroisoquinoline

3,3-Dimethyl-1-(3-methyl-1-phenylpyrazol-5-onylidene-4)-1,2,3, 4-tetrahydroisoquinoline has been synthesized and its crystalline and molecular structures determined. It was found by IR and electronic absorption spectroscopic methods that the structure of this compound is not changed in solutions.