For the following molecules, give the valence electron count, the formal oxidation state of the metal and its number of d-electrons.
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QUESTION 1 [24]
a) For the following molecules, give the valence electron count, the formal oxidation state of the metal and its number of d-electrons.
b) For the following pair of complexes predict with reasons which one will be more reactive
towards oxidative addition of H2.
c) The following reactions have been shown to proceed vis different mechanisms.
Predict and draw products A and B (making sure to pay attention to
stereochemistry) and present and name the mechanism leading to A and B in
each case.
d) The following reaction gives a mixture of three products in ≈ 33.3333333 % yield
each. Give the name of the reaction taking place and draw the structures of each
of the products, indicating which two are enantiomers.
QUESTION 2 [26]
a) [Cp*NbCl2(η2
-3-hexyne)] is an example of an electron-deficient early transition
metal organometallic complex. The alkyne in this complex is best considered to be
a 4-electron donor, in the covalent/neutral model. Draw all possible structures of
this complex in a 4- electron donor covalent/neutral model.
b) Predict the product of the following reactions and draw the structure of the resulting
product.
c) cis-[Pt(PEt2)3(n-butyl)2] decomposes readily at room temperature. Provide a
detailed mechanism and clearly drawn products for the two possible
decomposition pathways of the complex. In each mechanism label the reaction
taking place at each step.
d) With the aid of appropriate diagrams, describe bonding in a Schrock carbene.
