The 2,3-dimethy
lbutadiene comp
lex Tp
Me2Ir(CH
2=C(Me)C(Me)=CH
2) (
1) reacts with PhC
![](/images/entities/tbd1.gif)
CPh, inC
6H
12 at 60
![](/images/entities/deg.gif)
C, with coup
ling of the diene and the a
lkyne and formation of compound
2a, which containsan e
laborated bicyc
lic che
lating
ligand with a
lky
l and
3-a
lly
l functiona
lities. NCMe reacts reversib
lywith
2a, giving rise to a mixture of the isomeric iridacyc
lopentenes
TpMe2Ir(CH2C(Me)(CMe=CH2)C(Ph)=C(Ph))(NCMe) (
3) and
TpMe2Ir(CH2C(Me)(cis-CPh=CHPh)C(Me)=CH)(NCMe) (
4). Comp
lex
2adecomposes in C
6H
12 at 80
![](/images/entities/deg.gif)
C to give a comp
lex mixture from which an interesting substituted iridafu
lvene,
5, has been iso
lated by chromatography. A
ll these compounds have been characterized by NMRspectroscopy and X-ray crysta
llography. Possib
le reaction mechanisms for the formation of these speciesare discussed.