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(chem332)[2004](s)final~PPSpider^_10051.pdf
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Name: _______________________ Student ID: ____________________

Chem 332 Organometallic Chemistry, Final Examination

Note: I prepared the answers in rush. It may contain mistakes. Please let me know if you find obvious mistakes.

Monday, May 31, 2004. Time allowed, 120 minutes. Total 100 points (plus 5 bonus points)
Section 1. Multiple Choices (24 points total). For each question, select the most appropriate answer by either writing it out or circling your choice.

1.1 Which of the following complexes is most reactive towards oxidative addition of H2?

a) [Rh(PMe3)4]+ b) [Pd(PMe3)4]2+

c) [Ru(PMe3)4] d) [Fe(PMe3)4]

(c)
1.2 Which of the following oxidative addition reactions is/are most likely through a concerted mechanism?

a) IrI(CO)(PPh3)2 + CH3I -----------> IrI2(CH3)(CO)(PPh3)2

b) IrI(CO)(PPh3)2 + Me3SiH -----------> IrI(H)(SiMe3)(CO)(PPh3)2

c) IrI(CO)(PPh3)2 + H2-----------> IrI(H)2(CO)(PPh3)2

d) IrI(CO)(PPh3)2 + MeCOCl-----------> IrI(Cl)(MeCO)(CO)(PPh3)2

e) more than one of them f) none of them

(e)
1.3 Which of the following oxidative addition reactions would you expect to occur at the lowest reaction rate? Assuming non-concerted, SN2 pathway is involved in the reaction.

a) Fe(CO)3(PPh3)2 + CH3Br -----------> [Fe(CH3)(CO)3(PPh3)2]Br

b) Fe(CO)3(PPh3)2 + CH3CH2Br -----------> [Fe(CH2CH3)(CO)3(PPh3)2]Br

c) Fe(CO)3(PPh3)2 + CH3CH2Cl -----------> [Fe(CH2CH3)(CO)3(PPh3)2]Cl

d) Os(CO)3(PPh3)2 + CH3Br -----------> [Os(CH3)(CO)3(PPh3)2]Br

(c)
1.4 Which of the following oxidative addition reactions is least likely?



(c)

1.5 Which of the following reactions would you expect to occur most rapidly?



(d)

1.6 Which of the following reactions would you expect to have the largest equilibrium constant Keq?




(b)
1.7 Which of the following ligands could be used for asymmetric catalytic hydrogenation of CH2=C(CO2H)CH2CO2H?



e) two of them f) three of them g) all of them h) none of them

(e)
1.8 Which of the following complexes could be used as the catalyst or catalytic precursor for the following reaction?




a) Cp2Ru b) [RuHCl(PCy3)2]2 c) Co2(CO)8

d) Pd(PPh3)4 e) two of them f) three of them

g) all of them h) none of them

(f)
1.9 Which of the following complexes could be used as the catalyst or catalytic precursor for the following reaction?




a) Pt(PPh3)4 b) RhCl(PPh3)3 b) PtHCl(PPh3)2 d) SiH4

e) two of them f) three of them

g) all of them h) none of them

(f)
1.10 Which of the following complexes could be used as the catalyst or catalytic precursor for the following reaction?




a) RhCl(PPh3)3 b) Co2(CO)8

c) (RO)3WCCMe3 d) (Ph3P)2Cl2Ru=CHPh

e) two of them f) three of them

g) all of them h) none of them

(h)
1.11 Which of the following complexes could be use