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13C, 1H long‐range coupling constants in configuration assignment of some trisubstituted alkenes
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Personen und Körperschaften: | , , , |
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Titel: |
13C, 1H long‐range coupling constants in configuration assignment of some trisubstituted alkenes |
In: | Magnetic Resonance in Chemistry, 32, 1994, 9, S. 567-568 |
veröffentlicht: |
Wiley
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Umfang: | 567-568 |
ISSN: |
0749-1581 1097-458X |
DOI: | 10.1002/mrc.1260320918 |
Zusammenfassung: | <jats:title>Abstract</jats:title><jats:p>Chemical shifts and long‐range <jats:sup>13</jats:sup>C, <jats:sup>1</jats:sup>H coupling constants to the two carbonyl C atoms were determined for a series of ethyl 2‐acyloxy‐2‐alkenoates. The <jats:sup>3</jats:sup><jats:italic>J</jats:italic>(C,H) coupling constant across the double bond is 9.5–10.1 Hz for the <jats:italic>E</jats:italic>‐ and 2.9–3.8 Hz for the <jats:italic>Z</jats:italic>‐isomer. <jats:sup>3</jats:sup><jats:italic>J</jats:italic>(C,H) values, therefore, may be used as a criterion for <jats:italic>E/Z</jats:italic> differentiation even if only one isomer is available. <jats:sup>13</jats:sup>C chemical shift data, in contrast, cannot be employed for a straightforward differentiation.</jats:p> |
Format: | E-Article |
Quelle: | Wiley (CrossRef) |
Sprache: | Englisch |