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

Problems
(For the interpretation of the n.m.r. data ignore all couplings except those
between 1 H(I=tl and 31 P (I=t).)
(University of Southampton).
7. Suggest molecular structures for the products of the reactions below. clearly
indicating the bonding modes of organometallic ligands and briefly explaining
important features where appropriate.
l'4H&
(a) Fe(CO),----+ Fe(C 4 H 6 )(CO),
C 4 H 6 = 1,3-butadiene
C F
Fe(CO), ~ Fe(C 4 F 6 )(C0) 4
C 4 F 6 = hexafluoro-1.3-butadiene
(b) trans-PtC1 2 (PhNH 2 ) 2 PtC1 2 (C 4 H 6 )(PhNH 2 )
MeC "'CMe
IrCI(CO) (PEt,) 2 ----> ?
Mei
(d) Fe(C,H,)(C0) 2 (CH,)-----> Fe(C,H,)(C0) 2 (COCH,)
co
Cr(C0) 6
----+ (CO),Cr=C(OH)NEt,
Et 2 NH
(University of Edinburgh).
8. Some chemistry of platinum triethylphosphine complexes is shown below:
CO
NaOMe
~A (1:1 electrolyte) B
~gCl
------ C ~ D _N_aB_H....:. 4 .. E ~ F
(empiricol composition
PtP2 CLC 13 H 33 )
Infrared data
Vco(cm -1)
A 2100
B 1630
c
D 1620
Decoupled proton n.m.r. data (excluding PEt 3
signals; b relative to TMS)
2.8
0.5
2.2
E O. 7 and 0.8 (intensities 2: 3)
F 0.7, 0.8 and 0.5 (intensities 2:3:3)
(a) Propose a structure for each ofthe complexes A to F. using and interpreting
the spectroscopic data provided.
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