Novel intramolecular two-substituent migration accompanying indenoquinolone formation was written by Staskun, B.. And the article was included in Tetrahedron in 1972.Quality Control of Ethyl 3-oxo-3-(m-tolyl)propanoate This article mentions the following:
Cyclization of 2,2,4′-trichloro-2′,5′-dimethyl-2-benzoylacetanilide and 2,2,2′,4′-tetrachloro-3′,5′-dimethyl-2-benzoylacetanilide by concentrated H2SO4 gave 1,5-dichloro-4,6-dimethylindeno[1,2,3-de]quinolin-2(3H)-one and 1,4,6-trichloro-5-methyl-7H-dibenz[f,ij]-isoquinolin-2(3H)-one (II), resp. In the experiment, the researchers used many compounds, for example, Ethyl 3-oxo-3-(m-tolyl)propanoate (cas: 33166-79-9Quality Control of Ethyl 3-oxo-3-(m-tolyl)propanoate).
Ethyl 3-oxo-3-(m-tolyl)propanoate (cas: 33166-79-9) belongs to esters. Esters are also usually derived from carboxylic acids. It may also be obtained by reaction of acid anhydride or acid halides with alcohols or by the reaction of salts of carboxylic acids with alkyl halides. Esters contain a carbonyl center, which gives rise to 120° C–C–O and O–C–O angles. Unlike amides, esters are structurally flexible functional groups because rotation about the C–O–C bonds has a low barrier. Their flexibility and low polarity is manifested in their physical properties; they tend to be less rigid (lower melting point) and more volatile (lower boiling point) than the corresponding amides. Quality Control of Ethyl 3-oxo-3-(m-tolyl)propanoate
Referemce:
Ester – Wikipedia,
Ester – an overview | ScienceDirect Topics