4-Oxo-N-phenyl-4H-chromene-2-carboxamide and of a new polymorph of 7-methoxy-4-oxo-N-p-tolyl-4H-chromene-2-carboxamide and its hemihydrate

• Type: Article in International Scientific Journal
• Date: 2013

Authors

Joana Reis (Author) Other; Alexandra Gaspar (Author) Other; Fernanda Borges (Author) FCUP; Ligia R Gomes (Author) Other; John Nicolson Low (Author) Other

Journal

Title: Acta Crystallographica Section C: Crystal Structure Communications

Vol. 69

ISSN: 0108-2701

Publisher: Blackwell

Indexing

ISI Web of Knowledge - 3 Citations

Scopus - 4 Citations

Scientific classification

FOS: Natural sciences > Chemical sciences

Other information

Authenticus ID: P-006-JDR

Abstract (EN): 4-Oxo-N-phenyl-4H-chromene-2-carboxamide, C16H11NO3, crystallizes in the space group P2(1)/n and its derivative 7-methoxy-4-oxo-N-p-tolyl-4H-chromene-2-carboxamide, C18H15NO4, forms two polymorphs which crystallize in the space groups P2(1)/c and P (1) over bar. The structures have an anti-rotamer conformation about the C-N bond; however, the amide O atom can be either trans-or cis-related to the O atom of the pyran ring. The latter compound also crystallizes as a hemihydrate, C18H15NO4 center dot 0.5H(2)O, in the space group C2/c. This compound has a similar structure to that of the unsolvated compound.

Language: English

Type (Professor's evaluation): Scientific