glucopyranosides造句

• The order of reactivity from most reactive to least reactive is : ?-glucopyranosides > ?-mannopyranosides > ?-glucopyranosides > ?-mannopyranosides.
• The order of reactivity from most reactive to least reactive is : ?-glucopyranosides > ?-mannopyranosides > ?-glucopyranosides > ?-mannopyranosides.
• The 2-O-?-D-glucopyranosides of cucurbitacins K and L can be extracted with ethanol from fruits of " Cucurbita pepo " cv " dayangua ".
• The reaction of ? mannopyranosides gives low yields and required longer reaction times than with ?-glucopyranosides due to the presence of a neighboring axial substituent ( sulfonyloxy ) relative to C-3 sulfonyloxy group in the starting material.
• Joshi et al . propose the Koenigs-Knorr method in the stereoselective synthesis of alkyl D-glucopyranosides via glycosylation, with the exception of using lithium carbonate which is less expensive and toxic than the conventional method of using silver or mercury salts.
• The axial substituent increases the steric interactions in the transition state, causing unfavorable eclipsing of the two sulfonyloxy groups . ?-Glucopyranosides possess a ?-" trans "-axial substituent relative to C-3 sulfonyloxy ( anomeric OCH 3 group ) in the starting material.