Abstract
Examination of the PMR spectral changes (expressed as shift gradients of individual protons) wrought by graduated addition of the paramagnetic lanthanide complex tris [1,1,1,2,2,3,3-heptafluoro- 7,7-dimethyloctane-4,6-dionato]europium(III) [Eu(fod) 3] permitted assignment of the configuration at tertiary alcoholic centers of certain sugar derivatives. The configurations of the tertiary position of 3- C-(1,3-dithian-2-yl)-1,2:5,6-di- O-isopropylidene-α- d-allofuranose ( 1), lethyl of 4,6- O-benzylidene-2- deoxy-3- C-(dithian-2-yl)-α- d- ribo-hexopyranoside ( 2) and the corresponding 3- C-butyl compound ( 2a), and methyl 2- C-(1,3-dithian-2- yl)-3,4- O-isopropylidene-δ- d-ribopyranoside ( 3) were assigned by comparison with reference spectra. The proton shift-gradients for 5- C-benzoyloxymethyl-2,3- O- cyclohexylidene-1- O- p-tolylsulfonyl-1( R),2( S),3( S),5( R)-cyclohexanetetrol ( 4), taken in conjunction with the spin-spin coupling values, permit direct assignment of relative stereochemistry in the latter compound.
Sign-in/Register to access full text options 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
