Chemistry

Carbohydrate Chemistry : Proven Synthetic Methods by Pavol Kováč

By Pavol Kováč

Gone are the times whilst artificial courses integrated parallel preparative experiments to record reproducibility of the experimental protocols and while journals required such documentation. the hot confirmed artificial tools sequence addresses issues to chemists relating to irreproducibility of artificial protocols, loss of characterization info for brand spanking new compounds, and inflated yields said in lots of chemical Read more...

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45 mmol, 5 equiv) in dry DMF (10 mL). 5 equiv) was added at −30°C. 07). 07. 7 (OCH3). Anal. 77. 74. 5 mL). 5 equiv) as above Hex-2- and Hex-3-Enopyranosides Preparation 19 described for the preparation of 13. 74). 74. The mixture was cooled to −30°C and the excess of NaH was destroyed by addition of MeOH (2 mL). After 10 min, the solution was poured into a mixture of ice and ether, the two layers were separated and the aqueous phase was further extracted with ether (2 × 15 mL). The collected ethereal extracts were dried, filtered and concentrated under diminished pressure.

Fraser-Reid, B. J. Am. Chem. Soc. ; Ottosson, H. J. Org. Chem. ; Skowronski, E. J. Am. Chem. Soc. 1991, 113, 1434–1435. 4. J. Adv. Carbohydr. Chem. Biochem. 2004, 59, 69–134. 5. ; Fraser-Reid, B. Tetrahedron Lett. 1994, 35, 2637–2640. 6. ; Lipták, A. Carbohydr. Res. 2006, 341, 1312–1321. 7. P. Carbohydr. Res. ; Ciunik, Z. Tetrahedron Lett. 1997, 38, 273–276; (c) Banaszek, A. Carbohydr. Res. ; Parrilli, M. Tetrahedron Lett. ; Parrilli, M. Eur. J. Org. Chem. 2008, 2008, 5704–5714. 8. ; Lockhoff, O.

Positive MALDI-MS spectra were recorded on an Applied Biosystem Voyager DE-PRO MALDI-TOF mass spectrometer in the positive mode: compounds were dissolved in CH3CN at a concentration of 1 mg/mL and 1 μL of these solutions was mixed with 1 μL of a 20 mg/mL solution of 2,5-dihydroxybenzoic acid in 7:3 CH3CN–water. Optical rotations were measured on a JASCO P-1010 polarimeter. Elemental analysis was performed on a Carlo Erba 1108 instrument. Analytical thin layer chromatography (TLC) was performed on aluminum plates coated with Merck Silica Gel 60 F254 as the adsorbent.

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