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37th IChO Practical Examination Answer Sheets

Experiment 1. The Synthesis of D!"Phenyl#lycine an$ Its Optical %esol&tion

Total Scores: 100 points

1-1 1-2 1-3 1-4 1-5 '

Total Points () 1) () ) 3* 1**

%ecei+e$

Experiment (. I$entification of ,n-nown Inor#anic Samples


2-1 2-2 '

Total Points / 0 1**

%ecei+e$

1



Code: Name:

Experiment 1

The Synthesis of D!"Phenyl#lycine an$ Its Enantiomeric %esol&tion

Total Scores 1** points

1-1 1-2 1-3 1-4 1-5 '

Total Points () 1) () ) 3* 1**

%ecei+e$

Step 1. Preparation of 2D!"phenyl#lycine

1-1 Confirmed and signedby lab assistant

Weight of benzoylformic acid used: g g /

Weight of fritted glass funnel: g g /

After complete dryness:

Product weight + fritted glass funnel: g g /

[Weigh on a balance that reads to the nearest centigram (!"g#$!

Weight of %&'phenylglycine obtained: g

Chemical yield: )

Calculate the chemical yield () yield* show the calculations#!

2



Code: Name:

1-2

urn in the sample (in the ,ial with blue label#!

-ignature of student:

-ignature of the lab assistant:

[he organization committee will weigh an appropriate amount of sample (!"g# for ". 01

spectroscopic analysis!$

Step (. Enantiomeric resol&tion of D!"phenyl#lycine 4y 25"camphors&lfonic aci$ 625"CSA

1-3 Confirmed and signed

by lab assistant

Weight of %&'phenylglycine used: g g /

Weight of fritted glass funnel: g g /

After complete dryness:

Product weight + fritted glass funnel: g g / [Weigh on a balance that reads to the nearest centigram (!"g#$!

Weight of the resol,ed phenylglycine • (+#C-A salt: g

Chemical yield: )

Calculate the chemical yield () yield* show the calculations#!

3



Code: Name:

1-4

%raw the correct absolute stereochemical structure of the isolated phenylglycine!

1-5

-pecific rotation of the enantiomeric phenylglycine • (+# C-A salt (to be determined by the

organization committee#

urn in the sample (in the ,ial with pin2 label#!

-ignature of student:

-ignature of the lab assistant:

[he organization committee will weigh an appropriate amount of sample (!33 4 !53g# for

measurement of optical purity!$

4



Code: Name:

Experiment (

I$entification of ,n-nown Inor#anic Samples


2-1 2-2 '

Total Points / 0 1**

%ecei+e$

2-1

6n2nownCompound

Codeumber77

6n2nownCompound

Codeumber77

6n2nownCompound

Codeumber77

.Cl & .8-9 & .-C &

a9. & ;aCl8 & <=e(C#5 &

a8C9> & ?nCl8 &

a8-9> & .898 &

77-econd column is for duplicates!

2-2

A! Write the electrolysis e@uation that would help you confirm that an un2nown sample is ?nCl8!

;! Write one e@uation that shows how to clean the deposit of ?n on the electrode (limited to the

items pro,ided in this tas2#!

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