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4'-Chloro-3',5'-dimethoxy-acetanilide.

ABSTRACT: The title compound, C(10)H(12)ClNO(3), crystallizes with four independent mol-ecules in the asymmetric unit which are linked by inter-molecular N-H?O hydrogen bonds.

SUBMITTER: Li H

PROVIDER: S-EPMC2977757 | biostudies-literature | 2009 Apr

REPOSITORIES: biostudies-literature

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4'-Chloro-3',5'-dimethoxy-acetanilide.

Li Huiyu H Zhu Yanyan Y Chen Zhonghua Z

Acta crystallographica. Section E, Structure reports online 20090422 Pt 5

The title compound, C(10)H(12)ClNO(3), crystallizes with four independent mol-ecules in the asymmetric unit which are linked by inter-molecular N-H⋯O hydrogen bonds. ...[more]

PMID: 21583893

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Project description:Mol-ecules of the title compound, C(10)H(12)FNO(3), are nearly planar considering all non-H atoms with a mean deviation of 0.0288?Å. Mol-ecules are linked through inter-molecular N-H?O and N-H?F hydrogen bonds.

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Salt forms of amides: protonation of acetanilide.

Project description:Treating the amide acetanilide (N-phenylacetamide, C8H9NO) with aqueous strong acids allowed the structures of five hemi-protonated salt forms of acetanilide to be elucidated. N-(1-Hydroxyethylidene)anilinium chloride-N-phenylacetamide (1/1), [(C8H9NO)2H][Cl], and the bromide, [(C8H9NO)2H][Br], triiodide, [(C8H9NO)2H][I3], tetrafluoroborate, [(C8H9NO)2H][BF4], and diiodobromide hemi(diiodine), [(C8H9NO)2H][I2Br]·0.5I2, analogues all feature centrosymmetric dimeric units linked by O-H...O hydrogen bonds that extend into one-dimensional hydrogen-bonded chains through N-H...X interactions, where X is the halide atom of the anion. Protonation occurs at the amide O atom and results in systematic lengthening of the C=O bond and a corresponding shortening of the C-N bond. The size of these geometric changes is similar to those found for hemi-protonated paracetamol structures, but less than those in fully protonated paracetamol structures. The bond angles of the amide fragments are also found to change on protonation, but these angular changes are also influenced by conformation, namely, whether the amide group is coplanar with the phenyl ring or twisted out of plane.

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