Carbon­yl–carbonyl, carbon­yl–π and carbon­yl–halogen dipolar inter­actions as the directing motifs of the supra­molecular structure of ethyl 6-chloro-2-oxo-2H-chromene-3-carboxyl­ate and ethyl 6-bromo-2-oxo-2H-chromene-3-carboxyl­ate

Santos-Contreras, R.J.; Martínez-Martínez, F.J.; García-Báez, E.V.; Padilla-Martínez, I.I.; Peraza, A.L.; Höpfl, H.

doi:10.1107/S0108270107008712

Acta Crystallographica Section C
Acta Crystallographica
Section C STRUCTURAL CHEMISTRY

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Figure 4
The stacking arrangement of (I)

, in centrosymmetric pairs, viewed along the c axis. C11=O11⋯C2=O2, C11=O11⋯Cg1 and C6—X⋯C2=O2 (X = Cl and Br) dipolar interactions, as well as C13—H13A⋯Cg2 interactions, combine to develop the third dimension along the c axis. [Symmetry codes: (iii) −x + 1, −y, −z + 1; (iv) −x + 1, y + $[{1\over 2}]$ , −z + $[{1\over 2}]$ .]

STRUCTURAL
CHEMISTRY

ISSN: 2053-2296

Volume 63| Part 4| April 2007| Pages o239-o242

https://doi.org/10.1107/S0108270107008712

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