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

Table 3.

1H and 13C NMR assignments for syrinigc acid derivatives 3 and 4a

Position
 3
 4
  δCb δH (m, J Hz) δCb δH (m, J Hz)
1
 125.3, C
 -
 125.2, C
 -
2
 106.9, CH
 7.31 (s)
 107.0, CH
 7.31 (s)
3
 153.3, C
 -
 153.2, C
 -
4
 141.1, C
 -
 141.2, C
 -
5
 153.3, C
 -
 153.2, C
 -
6
 106.9, CH
 7.31 (s)
 107.0, CH
 7.31 (s)
1'
 136.1, C
 -
 137.6, C
 -
2'
 128.2, CH
 7.44 (d, 7.8)
 113.8, CH
 7.44 (d, 7.8)
3'
 128.5, CH
 7.39 (dd, 7.8, 7.2)
 159.8, C
 7.39 (dd, 7.8, 7.2)
4'
 128.0, CH
 7.28 (dd, 7.2, 7.2)
 113.6, CH
 7.28 (dd, 7.2, 7.2)
5'
 128.5, CH
 7.39 (dd, 7.8, 7.2)
 129.7, CH
 7.39 (dd, 7.8, 7.2)
6'
 128.2, CH
 7.44 (d, 7.8)
 120.4, CH
 7.44 (d, 7.8)
1'
 137.4, C
 -
 138.9, C
 -
2'
 128.2, CH
 7.46 (d, 7.2)
 113.5, CH
 7.46 (d, 7.2)
3'
 128.6, CH
 7.34 (dd, 7.8, 7.2)
 159.6, C
 7.34 (dd, 7.8, 7.2)
4'
 128.3, CH
 7.32 (m)
 113.9, CH
 7.32 (m)
5'
 128.6, CH
 7.34 (dd, 7.8, 7.2)
 129.2, CH
 7.34 (dd, 7.8, 7.2)
6'
 128.2, CH
 7.46 (d, 7.2)
 120.5, CH
 7.46 (d, 7.2)
7'-CH2
 66.8, CH2
 5.36 (s)
 66.7, CH2
 5.36 (s)
7'-CH2
 74.9, CH2
 5.08 (s)
 74.9, CH2
 5.08 (s)
3,5-OCH3
 56.3, CH3
 3.86 (s)
 56.3, CH3
 3.86 (s)
3'-OCH3
 -
 -
 55.2c, CH3
  
5'-OCH3
 -
 -
 -
 -
3'- OCH3
 -
 -
 55.3c, CH3
 -
-COO-
 166.2, C
 -
 166.2, C
 -
OH - - - -

aSpectra recorded in CDCl3. bMultiplicities were determined by DEPT 135. cAssignments may be interchanged.