Name:
CHML211
Exp. 8 Bromination of Stilbene—Green Synthesis
Tech
Pre
In
Post
Max
10
20
20
50
Score
Total Grade
PRE-LAB ASSIGNMENT: (EACH STUDENT will complete, print, and submit a copy at the beginning of the lab period.
Without a complete pre-lab assignment, you will not be allowed to perform the experiment, and will receive a zero
for the lab.) …..max score = 20 pts.
1. Objective (In the provided space, write a brief purpose of the experiment, addressing all of the following points: )



Name the reactants combined during the synthesis and the product formed.
What is the purification technique used in this experiment?
What analytical technique will be used during the experiment to determine purity?
2. Chemical Equation (In the provided space, draw the chemical equation for the synthesis of dibromostilbene using actual chemical structures.)
3. Physical Data (Complete the following table using MSDS sheets from the following link:
http://www.sigmaaldrich.com/united-states.html. Copy all of
the OSHA hazards using the hazard codes provided.)
Compound
trans-stilbene
dibromostilbene
48% Hydrobromic acid
30% hydrogen peroxide
Diethyl ether
ethanol
Sodium hydroxide
Acetone
Hexane
MW
(g/mol)
mp
(oC)
X
X
X
X
X
X
X
X
X
X
X
X
bp
(oC)
X
X
X
X
d
(g/mL)
X
X
X
X
OSHA HAZARDS
4. Experimental Outline (In the space provided, give a brief description of the procedure that will be followed in this experiment in 10 lines or less.)
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9
10
5. Pre-Lab Question (Answer the following question prior to lab.)
List 3 characteristics of a “perfect” chemical reaction based on green chemistry principles.
a.
b.
c.