作者:Alex F. C. Flores、Mauro J. Martins、Leandro M. Frigo、Pablo Machado、Patrick T. Campos、Juliana L. Malavolta
DOI:10.1080/00397911.2010.530376
日期:2012.3.1
Novel 1-aryl-4,4,4-trichloro-1,3-butanediones in good yields (80-97%) were synthesized in one pot through acetal acylation with trichloroacetyl chloride followed by acid hydrolysis. Structures of all compounds were elucidated by elemental analysis, mass spectrometry, and H-1/C-13 nuclear magnetic resonance (NMR) measurements. The H-1/C-13 NMR data showed that trichloromethyl-beta-diketones 2a-k in solution are predominantly ketoenol. However, the spectroscopic data from 4,4,4-trichloro-2-methyl-1-phenyl-1,3-butabedione (2l) with methyl substituent between carbonyls showed a bias toward the diketo form in solution. X-ray diffraction of monocrystals from 2g and 2i showed that these compounds are cis-ketoenol tautomers.Supplemental materials are available for this article. Go to the publisher's online edition of Synthetic Communcations (R) to view the free supplemental file.