153A_Lec11

153A_Lec11 - Carbohydrates Jan. 25, 2008 1 Overview...

Info iconThis preview shows pages 1–11. Sign up to view the full content.

View Full Document Right Arrow Icon
1 Carbohydrates Jan. 25, 2008
Background image of page 1

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
2 Overview Monosaccharides Ring structures Glycosidic Bond Disaccharides Polysaccharides
Background image of page 2
3 Sugars are conformationally variable • Five- and six-membered hexose rings are more stable – Stability depends on interactions between substituents on the ring • Haworth formulas are just models and not what the rings really look like naturally • Atoms in the rings are sp 3 hybridized so tetrahedrally shaped
Background image of page 3

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
4 Conformations of a cyclohexane ring e = equatorial a = axial a and e are interconvertable Substituents are eclipsed
Background image of page 4
5 The two alternative chair conformations of β -D-glucopyranose. Predominant conformation Bulky substituents are equatorial e = equatorial a = axial
Background image of page 5

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
6 Monosaccharides are reducing sugars
Background image of page 6
7 Some Hexose Derivatives
Background image of page 7

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
8 The reversible oxidation of L - ascorbic acid to L - dehydroascorbic acid.
Background image of page 8
9
Background image of page 9

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
10 Glycosidic Bond • Links monsaccharides – disaccharides – polysaccharides • Glycosidic bond: anomeric hydroxyl group of a sugar reversibly condenses with an alcohol of another
Background image of page 10
Image of page 11
This is the end of the preview. Sign up to access the rest of the document.

Page1 / 20

153A_Lec11 - Carbohydrates Jan. 25, 2008 1 Overview...

This preview shows document pages 1 - 11. Sign up to view the full document.

View Full Document Right Arrow Icon
Ask a homework question - tutors are online