English (United Kingdom)

https://curated-unify.zendy.io/wp-json/zendy-region/v1/featured_content/oa?rat=en

https://curated-unify.zendy.io/wp-json/zendy-region/v1/highlighted_journal/

Global: Zendy Plus annual

Presents the access of premium content as premium feature

Premium Content

Presents the keyphrase highlighting as premium feature

Keyphrase Highlighting

Presents the summarisation as premium feature

Summarisation

Insights

Presents the pdf analysis as premium feature

PDF Analysis

Presents the zaia usage as premium feature

ZAIA

Global: Zendy Tools annual

Global: Zendy Free Plan

Global: Zendy Tools monthly

Global: Zendy Plus monthly

Four N-(4-halophen-yl)-4-oxo-4H-chromene-3-carboxamides (halo = F, Cl, Br and I), N-(4-fluoro-phen-yl)-4-oxo-4H-chromene-3-carboxamide, C16H10FNO3, N-(4-chloro-phen-yl)-4-oxo-4H-chromene-3-carboxamide, C16H10ClNO3, N-(4-bromo-phen-yl)-4-oxo-4H-chromene-3-carboxamide, C16H10BrNO3, N-(4-iodo-phen-yl)-4-oxo-4H-chromene-3-carboxamide, C16H10INO3, have been structurally characterized. The mol-ecules are essentially planar and each exhibits an anti conformation with respect to the C-N rotamer of the amide and a cis geometry with respect to the relative positions of the Carom-Carom bond of the chromone ring and the carbonyl group of the amide. The structures each exhibit an intra-molecular hydrogen-bonding network comprising an N-H⋯O hydrogen bond between the amide N atom and the O atom of the carbonyl group of the pyrone ring, forming an S(6) ring, and a weak Carom-H⋯O inter-action with the O atom of the carbonyl group of the amide as acceptor, which forms another S(6) ring. All four compounds have the same supra-molecular structure, consisting of R 2 (2)(13) rings that are propagated along the a-axis direction by unit translation. There is π-π stacking involving inversion-related mol-ecules in each structure.

The crystal structures of fourN-(4-halophenyl)-4-oxo-4H-chromene-3-carboxamides