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NMR-Spectroscopic Investigations of Potentially Planarized Nonafulvenes

✍ Scribed by Shengyong Chai; Peter Bönzli; Markus Neuenschwander

Publisher
John Wiley and Sons
Year
1995
Tongue
German
Weight
828 KB
Volume
78
Category
Article
ISSN
0018-019X

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✦ Synopsis

An early explanation given by Hufner [lo] had to be abandoned in the light of new NMR experiments [12]. UV Extrapolations [Y] suggest AH' = -6.5 kcal.mol-l and ASo = -22 eu for the process Ic --t lc'. Similarly, Roche e f ul. [Ill determined AH"= -6.9 kcal mol-' and AS" = -30 eu for the equilibrium between sodium 1 O-methylnonafulven-10-olate and sodium acetylcyclononatetraenide. ') ' ) NOE Experiments are crucial for distinguishing H-C(1) and H-C(8) (showing a nearly identical splitting) of unsymmetrically substituted nonafulvenes such as l b [4] and le.

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