Thesis-Final 03 June 2011 pdf - Jacobs University

Results and discussion Chapter 3
123.34, 123.37 ppm and identified as C-18, C-27, C-36, C-19, C-28, C-37. Further
down the three aromatic carbons which hasn’t got and other atom adjacent to it found
at 132.32, 133.04, 133.34 ppm and assigned to C-14, C-23 and C-32. After checking
1 H 13 C-HMQC spectrum these signals followed by another three signals with slightly
smaller intensity at 141.74, 141.77 and 141.80 ppm. These signals identified as other
set of olefinic carbons and assigned to C-13, C-22 and C-31. The last carbons of
aromatic group which are adjacent to oxygen atoms were found at 145.35, 145.42,
145.50, 151.45, 151.51 and 151.60 ppm. The first three signals at 145.35, 145.42,
145.50 ppm identified as C-17, C-26 and C-35 which are next to the acetayl group of
feruloyl moiety. Then the 151.45, 151.51 and151.60 ppm identified as C-16, C-28 and
C-34 which are next to the methoxy group of feruloyl moiety. The carbonyl carbons
occurred at the very last part of the spectrum and identified concerning chemical shift
and 1 H 13 C-HMQC spectrum. The first carbonayl carbons found at 152.41, 165.70,
165.76, 165.81 ppm and assigned to 152.41 ppm carbonyl of Troc protecting group C-
8, carbonayl group of Feruloyl moieties C-11, C-20 and C-29. Then these peaks
followed by one big singlet at 168.74 ppm with three carbon intensity which proved
that three signals were overlapping and identified as carbonyls of acetayl group of
feruloyl moiety C-41, C-42 and C-43. The last signal at 169.95 assigned to C-7 as
before. The infrared spectrum shows strong signals at 2845 cm -1 (COOH), 1764, 1719
cm -1 (C=O), 1636 cm -1 (C Ar =C Ar ), 1259, 1198, 1123, 1088, 1033 cm -1 (C-O) which
are consistent with other spectrums of the compound.
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