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. 2013 Aug 19;13:82. doi: 10.1186/1475-2867-13-82

Table 2.

1H and 13C NMR assignments for syringic acid and its derivatives 2, 5 and 6a

Position
 Syringic acid
 2
 5
 6
  δCb δH (m, J Hz) δCb δH (m, J Hz) δCc δH (m, J Hz) δCb δH (m, J Hz)
1
 128.6, C
 -
 121.1, C
 -
 121.1, C
 -
 121.0, C
 -
2
 107.0, CH
 7.31 (s)
 106.8, CH
 7.36 (s)
 106.9, CH
 7.35 (s)
 106.8, CH
 7.38 (s)
3
 148.0, C
 -
 146.7,C
 -
 146.7, C
 -
 146.6, C
 -
4
 142.6, C
 -
 139.4, C
 -
 139.4, C
 -
 139.4, C
 -
5
 148.0, C
 -
 146.7, C
 -
 146.7, C
 -
 146.6, C
 -
6
 107.0, CH
 7.31 (s)
 106.8, CH
 7.36 (s)
 106.9, CH
 7.35 (s)
 106.8, CH
 7.38 (s)
1'
 -
 -
 136.3, C
 -
 137.9, C
 -
 136.5, C
 -
2'
 -
 -
 128.2, CH
 7.45 (dd, 7.8, 1.2)
 113.8d, CH
 6.98 (d, 2.2)
 105.9, CH
 6.59 (d, 2.4)
3'
 -
 -
 128.6, CH
 7.39 (dd, 7.8, 7.2)
 160.0, C
 -
 160.9, C
 -
4'
 -
 -
 128.2, CH
 7.34 (dd, 7.2, 1.2)
 113.7d, CH
 6.88 (dd, 8.1, 2.2)
 100.0, CH
 6.45 (dd, 2.4, 2.4)
5'
 -
 -
 128.6, CH
 7.39 (dd, 7.8, 7.2)
 129.8, CH
 7.30 (dd, 10.0, 8.8)
 160.9, C
 -
6'
 -
 -
 128.2, CH
 7.45 (dd, 8.8, 1.2)
 120.4, CH
 7.02 (d, 7.7)
 105.9, CH
 6.59 (d, 2.4)
7'-CH2
 -
 -
 66.7, CH2
 5.36 (s)
 66.8, CH2
 5.32 (s)
 66.5, CH2
 5.30 (s)
3,5-OCH3
 56.1, CH3
 3.86 (s)
 56.5, CH3
 3.93 (s)
 56.6, CH3
 3.93 (s)
 56.5, CH3
 3.95 (s)
3'-OCH3
 -
 -
 -
 -
 55.3, CH3
 3.82 (s)
 55.4, CH3
 3.82 (s)
5'-OCH3
 -
 -
 -
 -
 -
 -
 55.4, CH3
 3.82 (s)
OH - 4.93 (s) - 5.92 (s) - 5.91 (br s) - 5.95 (s)

aSpectra recorded in CDCl3. bMultiplicities were determined by DEPT 135. cMultiplicities were determined by APT. dAssignments may be interchanged.