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Brønsted acidic ionic liquids catalyzed the preparation of 13-aryl-5H-dibenzo[b,i]xanthene-5,7,12,14(13H)-tetraones and 3,4-dihydro-1H-benzo[b]xanthene-1,6,11(2H,12H)-triones

✍ Scribed by Hamid Reza Shaterian, Marziyeh Sedghipour…


Book ID
120765945
Publisher
Springer Netherlands
Year
2013
Tongue
English
Weight
407 KB
Volume
40
Category
Article
ISSN
0922-6168

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## Abstract The molecular structures of the title compounds 3 and 5 were investigated by NMR and X‐ray structural methods. The NMR results suggest two equivalent halves for both molecules. The X‐ray study shows an approximate mirror plane for 3 and an approximate twofold axis for a significant port