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Crystals 2016, 6(6), 66; doi:10.3390/cryst6060066

Synthesis and Molecular Structures of the Lowest Melting Odd- and Even-Numbered α,β-Unsaturated Carboxylic Acids—(E)-Hept-2-Enoic Acid and (E)-Oct-2-Enoic Acid

Leibniz Institute for Catalysis at the University of Rostock (LIKAT), Albert-Einstein-Str. 29a, D-18059 Rostock, Germany
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Academic Editor: Helmut Cölfen
Received: 13 May 2016 / Revised: 27 May 2016 / Accepted: 31 May 2016 / Published: 3 June 2016
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Abstract

The molecular structures of the two lowest melting odd- and even-numbered α,β-unsaturated carboxylic acids—(E)-hept-2-enoic acid (C7) and (E)-oct-2-enoic acid (C8)—are herein reported. The title compounds were crystallized by slow evaporation of ethanolic solutions at −30 °C. C7 crystallizes in the triclinic space group P 1 ¯ with two molecules in the unit cell and C8 in the monoclinic space group C2/c with eight molecules in the unit cell. The unit cell parameters for C7 are: a = 5.3049(2) Å, b = 6.6322(3) Å, c = 11.1428(5) Å, α = 103.972(3)°, β = 97.542(3)°, γ = 90.104(3)°, and V = 376.92(3) Å3 (T = 150(2) K). The unit cell parameters for C8 are: a = 19.032(10) Å, b = 9.368(5) Å, c = 11.520(6) Å, β = 123.033(11)°, and V = 1721.80(16) Å3 (T = 200(2) K). View Full-Text
Keywords: X-ray crystal structure; hydrogen bond; dimer; unsaturated carboxylic acid X-ray crystal structure; hydrogen bond; dimer; unsaturated carboxylic acid
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).

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Sonneck, M.; Spannenberg, A.; Wohlrab, S.; Peppel, T. Synthesis and Molecular Structures of the Lowest Melting Odd- and Even-Numbered α,β-Unsaturated Carboxylic Acids—(E)-Hept-2-Enoic Acid and (E)-Oct-2-Enoic Acid. Crystals 2016, 6, 66.

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