# Reaction Mechanisms and Catalysis (Worksheet)


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Work in groups on these problems. You should try to answer the questions without referring to your textbook. If you get stuck, try asking another group for help.

Inorganic Chemistry is extremely complex but the reactions that take place at the metal center can be characterized into 5 main groups; ligand substitution, oxidative addition, migratory insertion, reductive elimination and hydrogen abstraction. Understanding these mechanisms will give us a fundamental introduction to catalytic cycles which are one of the main uses for organometallic chemistry.

1. Does the oxidation state of the metals in either reaction change?
2. Does the structure of the compound change noticeably?
3. How might you characterize the products of these two experiments?
4. Draw the structures of the products and reactants in the following reactions.
2. Ni(CO)4 with PPh3
3. ($$\eta^{5}$$ -C5H5)Co(CO)2 with COD and photolysis

1. What is the oxidation state of the Co in the hexacarbonylcobalt compound? And what is is in the Chlorohydridotetracarbonylcobalt compound?
2. In the Iridium starting material what is the oxidation state, and what is the oxidation state in the product?
3. What is the primary difference between the way HCl and H2 oxidatively add?
4. How would you characterize a compound with an HH bond versus one that has two hydrides?
5. Draw the structures of the products and reactants in the following reactions
1. Re(CO)5 with HCl

1. If the labeled CO incorporated into the Me-M bond would we call it a migration? Explain.
2. Does the oxidation state of the metal change? Explain.
3. Draw the structures of the products and reactants in the following reactions
1. ($$\eta^{5}$$ -C5H5)Re(CO)2(C(O)Me)

1. How do the oxidation states change from reactant to product in these types of reactions?
2. What are the driving forces for these types of reactions?
3. Draw the structures of the products and reactants in the following reaction:
1. Ir(PPh3)4(H)Cl with excess CO at high pressure

1. What is the difference between a Fisher Carbene and a Schrock Carbene?
2. What is the overall change in the oxidation state in a $$\beta$$-hydride abstraction? $$\alpha$$-hydride abstraction?
3. Draw a bonding diagram for the M interaction with the Carbene carbon – what role does the O play? Are their other elements that might fulfill that role?
4. Draw the following compound - ($$\eta^{5}$$ -C5H5)Re(CO)2C(OMe)Ph

Suggest a synthesis for the following compounds –

1. Mo($$\eta^{6}$$ -C6H6)(CO)3
2. (CO)4CoMn(CO)5
3. ($$\eta^{5}$$ -C5H5)Re(CO)2C(OMe)Ph
4. Pt(Ph3P)2(CH2CH2)
5. ($$\eta^{5}$$-C5H5)ReH
6. ($$\eta^{5}$$-C5H5)2Fe(CO)4

## Reference

• Kelley J. Donaghy, SUNY-ESF

Reaction Mechanisms and Catalysis (Worksheet) is shared under a CC BY-NC-SA license and was authored, remixed, and/or curated by LibreTexts.