Details
| Original language | English |
|---|---|
| Pages (from-to) | 483-487 |
| Number of pages | 5 |
| Journal | Zeitschrift fur Naturforschung - Section B Journal of Chemical Sciences |
| Volume | 50 |
| Issue number | 4 |
| Publication status | Published - Apr 1995 |
| Externally published | Yes |
Abstract
The13C NMR parameters of several cyclobutabenzenes (1a-1e) and their corresponding complexes (cyclobutabenzene)M(CO)3(M = Cr, Mo, W. 2–4) are presented and discussed. Two cyclobutabenzenes 1b and 1d and their chromium tricarbonyl complexes 2b and 2d have been examined in greater detail: the signal assignments have been confirmed by 2 D-IN ADEQUATE and the one bond coupling constants 1J(13C13C) measured at natural abundance using 1 D-INADEQUATE. Although the results provide no insight into why the chromium complex of 1,2-dioxocyclobutabenzene (1e) is much more reactive at the keto groups than le itself, they do reveal a weak but not negligible alternation of the carbon s-character in the C-C bonds of the 6-membered rings both in the free cyclobutabenzenes and in the complexes, thus providing evidence for slight bond fixation (Mills-Nixon effect).
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In: Zeitschrift fur Naturforschung - Section B Journal of Chemical Sciences, Vol. 50, No. 4, 04.1995, p. 483-487.
Research output: Contribution to journal › Article › Research › peer review
}
TY - JOUR
T1 - Bonding in Cyclobutabenzene Chromium Tricarbonyl Complexes Studied by 13C NMR
T2 - Evidence of π-Bond Localization from 1J(13C,13C)
AU - Butenschön, H.
AU - Gabor, B.
AU - Mynott, R.
AU - Wey, H. G.
PY - 1995/4
Y1 - 1995/4
N2 - The13C NMR parameters of several cyclobutabenzenes (1a-1e) and their corresponding complexes (cyclobutabenzene)M(CO)3(M = Cr, Mo, W. 2–4) are presented and discussed. Two cyclobutabenzenes 1b and 1d and their chromium tricarbonyl complexes 2b and 2d have been examined in greater detail: the signal assignments have been confirmed by 2 D-IN ADEQUATE and the one bond coupling constants 1J(13C13C) measured at natural abundance using 1 D-INADEQUATE. Although the results provide no insight into why the chromium complex of 1,2-dioxocyclobutabenzene (1e) is much more reactive at the keto groups than le itself, they do reveal a weak but not negligible alternation of the carbon s-character in the C-C bonds of the 6-membered rings both in the free cyclobutabenzenes and in the complexes, thus providing evidence for slight bond fixation (Mills-Nixon effect).
AB - The13C NMR parameters of several cyclobutabenzenes (1a-1e) and their corresponding complexes (cyclobutabenzene)M(CO)3(M = Cr, Mo, W. 2–4) are presented and discussed. Two cyclobutabenzenes 1b and 1d and their chromium tricarbonyl complexes 2b and 2d have been examined in greater detail: the signal assignments have been confirmed by 2 D-IN ADEQUATE and the one bond coupling constants 1J(13C13C) measured at natural abundance using 1 D-INADEQUATE. Although the results provide no insight into why the chromium complex of 1,2-dioxocyclobutabenzene (1e) is much more reactive at the keto groups than le itself, they do reveal a weak but not negligible alternation of the carbon s-character in the C-C bonds of the 6-membered rings both in the free cyclobutabenzenes and in the complexes, thus providing evidence for slight bond fixation (Mills-Nixon effect).
KW - C NMR Spectra
KW - Cyclobutabenzene
KW - Mills-Nixon Effect
UR - http://www.scopus.com/inward/record.url?scp=24244461702&partnerID=8YFLogxK
U2 - 10.1515/znb-1995-0405
DO - 10.1515/znb-1995-0405
M3 - Article
AN - SCOPUS:24244461702
VL - 50
SP - 483
EP - 487
JO - Zeitschrift fur Naturforschung - Section B Journal of Chemical Sciences
JF - Zeitschrift fur Naturforschung - Section B Journal of Chemical Sciences
SN - 0932-0776
IS - 4
ER -