The stucture of D-glucose is shown below. Draw the Fischer projection of L-glucose in the space provided. L-glucose
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1 CEM ovember 2003 The stucture of D-glucose is shown below. Draw the Fischer projection of L-glucose in the space provided. D-glucose C C 2 L-glucose C 9 C 2 D-glucose is in equilibrium with two cyclic pyranose forms. Give the aworth projection of these two cyclic forms. C 2 C 2 Give the products obtained when D-glucose is treated with the following reagents. methanol / + [Ag( 3 ) 2 ] + / solution 1. ab 4 2. dilute acid C 2 C 3 + C 2 C 3 C 2 C 2 C 2 C 2 ASWER CTIUES TE EXT PAGE
2 CEM ovember 2003 Draw the aworth structure of a non-reducing disaccharide, which, on acid hydrolysis, yields D-glucose as the only product. C 2 C 2
3 CEM J-9 June 2004 The stucture of D-mannose is shown below. Draw the Fischer projection of L-mannose in the space provided. D-mannose C C 2 L-mannose C 10 C 2 D-Mannose is in equilibrium with two cyclic pyranose forms. Give the aworth projection of these two cyclic forms. C 2 -anomer C 2 -anomer Give the products obtained when D-mannose is treated with the following reagents. methanol / [Ag( 3 ) 2 ] / solution 1. ab 4 2. dilute acid C 2 C 3 C 2 C 2 C 2 C 3 C 2 C 2 ASWER CTIUES TE EXT PAGE
4 CEM J-9 June 2004 Draw the aworth structure of a reducing disaccharide, which, on acid hydrolysis, yields D-mannose as the only product. C 2 C 2
5 CEM J-10 June 2005 An important group of oligosaccharides is the blood group antigens. The blood group antigen of humans with blood group B can be represented by the partial structure below, in which R is a glycoprotein. 6 C 2 C 2 R 3 C The type B blood group antigen can be hydrolysed to galactose (2 mole equiv.), fucose (1 mole equiv.) and a glycoprotein unit. Specify the fucose unit in the type B blood group antigen as a furanose or a pyranose. Specify fucose as a hexose, a pentose or a tetrose. pyranose hexose Give the Fischer projections of the open chain form of galactose and fucose. Fischer projection of galactose Fischer projection of fucose C C * C 2 C 3 n your Fischer projection of galactose indicate with an asterisk (*) the carbon atom used in the D/L convention. Specify the galactose from blood antigen as D-galactose or L-galactose. D-galactose Specify the fucose from blood antigen as D-fucose or L-fucose. L-fucose
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