On the way to the pentafluorocyclopentadienide-ion, c-C5F5−

493 o-17

ON THE WAY TO THE PENTAFLUOROCYCLOPENTADIENIDE-ION, Gerhard

Paprott*,

Freie Universitit (F.R.G.)

Dieter Lents and Konrad Berlin, Institut

c-C,F;

Seppelt

ftir Anorganische

und Analytische

Chemie,

Another attempt was tried to produce the title ion c-&F,-. J

1000 Berlin 33

The

J

reaction goes along the following steps: Cl

_\

*:I,

Cl

Cl

Cl

l---J,HgF2 ’

Cl

t

(11)

,,~,,

Cl Cl

F Cl

b)

(1

(III,

3 Isomers)

Cl F F -$-+-Cl

cl

F

(III)

d)

F Zn,R-COOH (IV)

W

F

I

(IV,

4 Isomers)

F \

F

(V)

a H F 1,2,3,4,5 Pentafluorocyclopentadiene

(V) is a very reactive diene. If

pure, dimerisation occurs already at -78"C, and is partially reversible at 700°C. The first reactions of V will be presented.