Phytochemistry, 63, 415 (2003)
In this article the compound
11-pentacosanone (CAS-RN: 596814-07-2) is described; according to a
search using SCIFinder, this article is the only occurence of this
particular compound. In the text, this compound is named
'11-pentacosanone' whereas in the experimental part '1-pentacosanone'
is used. This typo is the smaller problem, the more disturbing fact is,
that the carbonyl-carbon is given at 178.0ppm (expected around 211ppm)
- either the authors didnt recognize a 'folding' in a FT-spectrum or -
more probable - the structure is wrong. Such a ketone having two
long-chain alkyl-substituents should give signals at 42-43ppm for the
alpha-position with respect to the carbonyl and around 24ppm for the
beta position. There is no such signal available at 43ppm, the signal
is at 24.7ppm is misassigned to C-2/C-24 respectively.
Therefore my personal conclusion is:
Simply ignore these data !
written by: Wolfgang.Robien(-at-)c13nmr.at
Page written on: April 1st, 2008