PREPARATION OF 9-PHENYLETHYNYL-4-AZAFLUOREN-9-OL AND 9-PHENACYLIDENE-4-AZAFLUORENE AND THEIR CONVERSION TO SPIRO COMPOUNDS

Article abstract of DOI:10.1007/BF00513858

9-Phenylethynyl-4-azafluoren-9-ol, which was obtained from 4-azafluorenone and phenylethynylmagnesium iodide, was used in syntheses of isomeric 9-phenacylidene-4-azafluorenes and spiro compounds with indene, indan, and pyrazoline fragments.It is assumed that conversion of 9-phenacylidene derivatives to spiro compounds takes place via intramolecular substitution.