Thesis-Final 03 June 2011 pdf - Jacobs University

Results and discussion Chapter 3
ppm. The first two pear assigned to C-12 and C-23 due to crosspeaks at 1 H 1 H-COSY
spectrum then the other pear at 146.50 and 1147.11 ppm assigned to C-13 and C-24.
The four carbons of each aromatic group were found around 109.90, 110.02, 111.20,
111.30, 123.14, 123.46, 127.02 and 127.22 ppm. The peaks were assigned to C-15, C-
26, C-18, C-29, C-19, C-30, C-14 and C-25 carbons. The other set of peaks at 149.42,
149.59, 151.65 and 151.99 ppm were the peaks which are adjacent to oxygen atoms.
These peaks assigned C-16, C-17, C-27 and C-28. The peak at 152.14 ppm assigned
to C-8 carbonyl carbon the it followed by the peaks at 165.36 ppm which was
assigned to C-11 then the other peak at 165.64 ppm which was assigned to C-22. The
last peak in very down filed found at 170.31 ppm and assigned to C-7.
Figure 97: 13 C-NMR spectrum of (86)
The infrared spectrum shows absorptions for the carbonyl ester and the aromatic
groups as expected. The mass spectrum shows the molecular ion and a series of
fragment ions corresponding to dehydrated fragments of the title compound 86.
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