Structure elucidation of acetylation products of 2-acyl-1,3-indanediones by correlation of infrared spectral data
摘要:
2-(1-Acetoxyalkylidene)- and 2-(1-acetoxybenzylidene)-1,3-indanediones (1 a-1 e) were proven to be the products of acetylation of 2-acyl-1,3-indanediones (2 a-2 e) by ketene using a detailed investigation and correlation analysis of infrared spectral data as well as H-1-NMR and C-13-NMR spectra. Study by means of CNDO/2 and MMPI methods also demonstrates that the structure 1 is more stable as the alternative one of 2-acyl-3-acetoxy-2-indene-1-ones (5). It was shown that the recently proposed general correlations nu(C = O)s vs. nu(C = O)as and nuBAR(C = O) vs. SIGMA-X+(R) as well as the mechanical anharmonicities of asymmetric C = O stretching vibration can be successfully used as a tool of structural diagnostics of cyclic 1,3-dicarbonyl compounds.
Ozonolysis of Enol Ethers. Part 10. Ozonization of Enol Ethers from 1,2- and 1,3-Dicarbonyl Compounds: Direct Quantitative Synthesis of Phthalonic Acid Anhydride The results of ozonolyses of enol ethers from 1,2- and 1,3-dicarbonyl compounds presented here strongly indicate that these reactions do not proceed via the established Criegee ozonolysis mechanism for nucleophilic CC bonds. The quantitative