_P.-Powell-auth.-Principles-of-Organometallic-Chemistry-Springer-Netherlands-1988

Problems
a range oftemperature indicate that conformation (A) is more stable than (B) by
about 50kJmol- 1 •
6.3 References
~ \:t
Mn .Mn
c/~~ c/'J "'-c,
o o o c o
o o
(A) (8)
Albright. T.A. (1982) Ace. Chem. Research, 15, 149.
Albright, T.A. and Whangbo, M-H. ( 198 5) Orbita] Interactions in Chemistry, Wiley,
Chichester.
Green, J.C. (1981) Gas phase photoelectron spectra of d and f block organometallic
compounds. Struct. Bonding, 43, 3 7.
Hoffmann, R. (1982) Nobellecture. Angew. Chem. (lnt. edn.), 21. 71.
Mingos, D.M.P. (1982) Comprehensive Organometallic Chemistry, (Voi. 3, Chapter 1).
Muetterties, E.L., Bleeke, J.R., Wucherer, E.J. and Albright. T.A. (1982) Structural.
stereochemical and electronic features of arene metal complexes. Chem. Revs, 82, 499.
Stane, F.G.A. (1984) Isolobal relationships. Angew. Chem. (Int. edn.), 23, 89.
Problems
1. Apply the 18-electron rule to predict the compounds which are likely to be
formed by the following combinations of metals and ligands. Mononuclear,
neutra! compounds only are required.
(a) '7'-Cp, CO, V (b) 1] 5 -Cp, CO, Co (c) 1] 5 -Cp, NO, Ni (d) H, PP,. Pe (e) 1.3, 5-
cycloheptatriene, 1] 5 -Cp, Mn (f) 1, 3-butadiene, CO, Pe (g) allyl (C,H 5 ), CO, Co (h)
pentadienyl (H 2 C-'--'-'-CH-'--'-'-CH-'--'-'-CH-'--'-'-CH 2 ), CO. Mn.
2. Suggest likely structures for each of the cations
[{1J'-Cp)Mo(C 8 H 8 )] +; [('7'-Cp)Mo(C 8 H 8 )(PMe,)] +;
[ ('7'-Cp )Mo(C 8 H 8 ) (Me 2 PCH 2 CH 2 PMe 2 )] +.
3. Using the 18-electron rule, or the 16-electron rule where appropriate,
predict likely structures for the following compounds:
(a) Mo(C 6 H 6 )(CO), (b) [Rh(l, 5-COD)Cl],
(c) [Rh(l, S-COD)(C 6 H 6 )] + (d) Rh(l, 5-COD)(acac)
(e) Rh(C,H,){C 6 (CP,) 6 } (f) (Azulene)Mo 2 (C0) 6
(g) (Azulene)Mn 2 (C0) 6 (h) (Azulene)Pe 2 (C0) 5
(1, 5-COD = 1, 5-cyclooctadiene; acac = acetylacetonate (2, 4-pentanedionate).
4. Sketch the structures of each of the following molecules, clearly indicating
the ways in which the ligands are attached to the metal.
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