To answer questions 2, 3 and 6, optical rotation of ( 1 R ,2 R )-()-1,2-Diaminocyclohexane []20/D 10.

To answer questions 2, 3 and 6, optical rotation of (1R,2R)-(−)-1,2-Diaminocyclohexane[α]20/D −10.36°, c = 5To answer question 5, optical rotation of the synthesized diimine (Jacob's ligand) [α]D20= - 315° (c=1, CH2Cl2).

1)Draw the structure of 1R,2R)-(−)- 1,2-Diaminocyclohexane

2) Discuss the optical rotation value obtained for both racemic 1,2-diamino

cyclohexane and (1R,2R)-(−)- 1,2-Diaminocyclohexane.

3) Predict the optical rotation value of (1S,2S)-1,2- Diaminocyclohexane.

4) Are the melting points of racemic 1,2-diamino cyclohexane and (1R,2R)-(−)- 1,2-

Diaminocyclohexane the same ? Explain.

5) Define enantiomeric excess. Calculate it for the synthesized diimine (Jacob's

ligand).

6) Was the resolution of racemic 1,2-Diaminocyclohexane successful? Explain.