CASE STUDY OF 2,3,4-tri-O-benzoyl-beta-L-lyxopyranoside.pptx

CASE STUDY OF 2,3,4-tri-O-benzoyl-beta-L-lyxopyranoside

1. 1 H NMR CASE STUDY ON 2, 3, 4-tri-O-benzoyl-beta-L-lyxopyranoside

2. δ 3.29 (3H, s) 3.80-4.07 (2H, 3.88 (dd,  J  = 13.3, 10.3 Hz) , 4.00 (dd,  J  = 13.3, 2.6 Hz))

3. 4.41 (1H, d,  J  = 2.7 Hz) 4.65 (1H, dd,  J  = 10.2, 3.5 Hz) 4.92 (1H, td,  J  = 10.2, 2.6 Hz)

4. 5.16 (1H, dd,  J  = 3.5, 2.7 Hz) In the NMR spectrum of 2,3,4-tri-O-benzoyl L- lyxopyranoside , the sharp peak at δ 3.53 represents OCH 3 Decoupling of protons at δ 5.75 causes the multiplet at δ 5.45 to collapse to four peaks and the double t at δ 5 to form sharp singlet peak Similarly, decoupling of protons at δ 5.45 causes the multiplet at δ 5.75 to collapse to doublets and the pair of doublets at δ 4.45 and δ 3.77 to two doublets

5. 7.95-8.13 (6H, 8.02 ( dddd ,  J  = 8.5, 1.9, 1.5, 0.4 Hz), 8.02 ( dddd ,  J  = 8.5, 1.9, 1.5, 0.4 Hz), 8.06 ( dddd ,  J  = 8.5, 1.9, 1.5, 0.4 Hz)) 7.38-7.53 (6H, 7.46 ( dddd ,  J  = 8.5, 7.5, 1.3, 0.4 Hz), 7.46 ( dddd ,  J  = 8.5, 7.5, 1.3, 0.4 Hz), 7.46 ( dddd ,  J  = 8.5, 7.5, 1.3, 0.4 Hz)) 7.54-7.66 (3H, 7.60 ( tt ,  J  = 7.5, 1.5 Hz), 7.60 ( tt ,  J  = 7.5, 1.5 Hz), 7.60 ( tt ,  J  = 7.5, 1.5 Hz))

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