Chapter 4 - Carbs Structure And Fx

Question 1

Draw out

1) D-fructose
2) D-glucose
3) D-Mannose
4) D-Galactose

**fischer, line, dash/wedge

Answer 1

To the drawing board!

Question 2

What is absolute configuration ? What is relative?.

Answer 2

Absolute: R vs S
D. L

Relative : cis / trans

Question 3

What do + and - denote for molecules?

Answer 3

The direction of rotation

*cannot be determined by L and D…needs to be experimentally

Question 4

Epimer

Answer 4

Type of diastereomers that differ in configuration by exactly one chiral centre

Question 5

How many carbons are in Pyranose and furanose?

Answer 5

Pyranose: six

Furanose: 5

Question 6

Anomeric carbon

Answer 6

On a cyclic sugar, the carbon which is attacked by the OH …Which becomes chiral

Forms alpha and beta anomers
**think of them relative to the CH2OH

Trans = alpha 
Cis = beta

Question 7

What is mutarotation?

Answer 7

Spontaneous change about C-1 carbon between alpha and beta

Question 8

Draw:

1) sucrose
2) lactose
3) maltose

Answer 8

Good luck

Question 9

Draw the chair conformation of glucose

Answer 9

Another draw. Daniel, I’m going to have to trust you can do this

Question 10

What is maltose made of of?

Answer 10

Glucose - glucose

Question 11

Sucrose is…

Answer 11

Glucose and fructose

Question 12

Lactose

Answer 12

Glucose and galactose