Methyltrans-6-oxo-11-thiophen-2-yl-11,12-dihydro-6H-dibenzo[c,h]chromene-12-carboxylate

Abstract

Key indicatorsSingle-crystal X-ray study T = 293 K Mean (C-C) = 0.009 Å Disorder in main residue R factor = 0.084 wR factor = 0.254 Data-to-parameter ratio = 12.5For details of how these key indicators were automatically derived from the article, see

New Highly Diastereoselective Perkin/Michael Addition Domino Reaction between Homophthalic Anhydride and Aromatic Aldehydes: A Facile Approach to Blue‐Fluorescent Dibenzo[c,h]chromenones

“…The proposed trans configuration was further confirmed independently by X‐ray diffraction analysis of 5a (Figure 1, left; for details see the Supporting Information). The data is in agreement with a previously reported X‐ray study of the methyl ester of 5h ,9f which showed that it is a conformationally rigid compound. Furthermore, the observed 3 J 11,12 coupling constant of 1.2 Hz did not depend on the polarity of the solvent used for recording the NMR spectra, in contrast to the conformationally more flexible 3,4‐disubstituted 3,4‐dihydroisocoumarin 9g.…”