Friedel-Crafts Acylation of Ferrocene (Part I)
CHE 252 PreLab Quiz #4
Spring 11
Name: ______________________________
5 pts
1. In its chemical reactivity ferrocene is most similar to which chemical species?
a) Fe2+
b) ethene
c) ethyne
d) benzene
2. The reactive electrophile in the acylation of ferrocene experiment is
a) Fe2+
b) CH3+
c) CH3CO+
d) Cl2
Consider the thin layer chromatogram below that is done on silica gel using the solvent
dichloromethane as the eluent and illustrates the separation of two organic compounds labeled A
and B.
origin
solvent
front
A
B
3. Which compound is more polar?
a) A
b) B
c) They have the same polarity.
4. Calculate the Rf value of compound A under the above conditions?
5. What change would be most effective in increasing the Rf values of A and B?
a)
b)
c)
d)
change to a more polar solvent like acetone
change to a less polar solvent like hexane
add more sample to the TLC slide before it is eluted
allow more time for the solvent front to move further