Intra- vs. intermolecular hydrogen bonding: dimers of alpha-hydroxyesters with methanol‡

Literature Information

Publication Date 2006-08-24
DOI 10.1039/B609725A
Impact Factor 3.676
Authors

Nicole Borho, Martin A. Suhm, Katia Le Barbu-Debus, Anne Zehnacker


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Abstract

Intermolecular hydrogen bonding competes with an intramolecular hydrogen bond when methanol binds to an α-hydroxyester. Disruption of the intramolecular OH⋯OC contact in favour of a cooperative OH⋯OH⋯OC sequence is evidenced by FTIR spectroscopy for the addition of methanol to the esters methyl glycolate, methyl lactate and methyl α-hydroxyisobutyrate in seeded supersonic jet expansions. Comparison of the OH stretching modes with quantum-chemical harmonic frequency calculations and 18O labelling of methanol unambiguously prove the insertion of methanol into the intramolecular hydrogen bond. This is in marked contrast to UV/IR hole burning studies of the homologous system methyl lactate: (±)-2-naphthyl-1-ethanol, where only addition complexes were found and the intramolecular hydrogen bond was conserved. This switch in hydrogen bond pattern from aliphatic to aromatic heterodimers is thought to reflect not only a kinetic propensity but also a thermodynamic preference for addition complexes when dispersion forces become more important in aromatic systems.

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Physical Chemistry Chemical Physics
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