Can anybody suggest me a good preparation of pentamethyl-cyclopentadiene (Cp*)? Thanks, Sztaray Balint Eotvos University of Budapest Gen. Inorg. Chem. Dept.
In article <1994Feb15.200524.1852@ludens>, <szta…@ludens.elte.hu> wrote: >Hi!
>Can anybody suggest me a good preparation of pentamethyl-cyclopentadiene (Cp*)? >Thanks, > Sztaray Balint > Eotvos University of Budapest > Gen. Inorg. Chem. Dept.
The method I currently use involves the preparation of 2-buten-2-yl lithium from 2-bromo-2-butene and lithium metal in ether. This is then reacted with ethyl acetate to give 3,5-dimethyl-2,5-heptadien-4-ol. Treatment of this alcohol with pTsOH in ether gives pentamethyl cyclopentadiene in decent yield. If you’d like more info, I could elaborate on this procedure and dig up the reference.
In article <1994Feb15.200524.1852@ludens>, <szta…@ludens.elte.hu> wrote:
>Hi!
>Can anybody suggest me a good preparation of pentamethyl-cyclopentadiene (Cp*)?
>Thanks,
> Sztaray Balint
> Eotvos University of Budapest
> Gen. Inorg. Chem. Dept.
The method I currently use involves the preparation of 2-buten-2-yl lithium
from 2-bromo-2-butene and lithium metal in ether. This is then reacted with
ethyl acetate to give 3,5-dimethyl-2,5-heptadien-4-ol. Treatment of this
alcohol with pTsOH in ether gives pentamethyl cyclopentadiene in decent yield.
If you’d like more info, I could elaborate on this procedure and dig up the
reference.
Kevin Shaughnessy (kevs…@leland.stanford.edu)
The compound was named erroneously, it should be 3,4,5-trimethyl-2,5-
heptadien-4-ol. Walter.