1987
DOI: 10.1002/mrc.1260251204
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13C NMR assignments of the isoprenoid chain carbons of retinoids from empirical chemical shift differences

Abstract: C NMR assignments have been made for a series of 36 a-and 3,4-dehydroretinoids with different substituents (alcohol, ester, aldehyde and acid) and for their separated E and Z geometrical isomers. The assignments were made by using 2D heteronuclear-correlated NMR experiments. From the chemical shift data of 24 systematically related retinoids, empirical chemical shift changes due to four polar end groups (alcohol, aldehyde, carboxylic acids and esters), three chain configurations (all-E, 9Z and 132), and two ri… Show more

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Cited by 6 publications
(3 citation statements)
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“…The XH NMR chemical shift assignments of F/Zisomers of ester 8 (Table 3) were made by selective decoupling experiments and COSY 2D experiments. JH NMR chemical shifts of H-8-H-14 were comparable to similar retinoids.19 Both these shifts and the 13C NMR shifts are very sensitive to different F/Z-configurations as reported by Vaezi et al22 and by Hope et al 23 Individual F/Z-isomers of 8 were hydrolyzed to the corresponding acid in KOH. 24 Using NMR spectroscopy, the hydrolysis was shown to proceed without F/Zisomerization.…”
Section: >97supporting
confidence: 60%
“…The XH NMR chemical shift assignments of F/Zisomers of ester 8 (Table 3) were made by selective decoupling experiments and COSY 2D experiments. JH NMR chemical shifts of H-8-H-14 were comparable to similar retinoids.19 Both these shifts and the 13C NMR shifts are very sensitive to different F/Z-configurations as reported by Vaezi et al22 and by Hope et al 23 Individual F/Z-isomers of 8 were hydrolyzed to the corresponding acid in KOH. 24 Using NMR spectroscopy, the hydrolysis was shown to proceed without F/Zisomerization.…”
Section: >97supporting
confidence: 60%
“…The chemical shift assignments (Table 2) for the UAB4 isomers were made using methods previously described. 19,24,25 As shown in Scheme 2, the synthesis of UAB1 was accomplished by a modification of the approach in Scheme 1. Since Horner-Emmons condensations on 2-cyclohexenone gave only 1,4-addition products, we first generated ester 7, a dihydro precursor to UAB1.…”
Section: Chemistrymentioning
confidence: 99%
“…Experimental yields and selected data for the intermediates and products in Scheme are summarized in Table . The chemical shift assignments (Table ) for the UAB4 isomers were made using methods previously described. ,,
1
2
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Section: Chemistrymentioning
confidence: 99%