Pentafluorothio-ketene — preparation and reactions

135

I 55 PENTAFLUOROTHIO-KETENE

- PREPARATION AND REACTIONS

G. Kleemann, Th. Kriigerke* and K. Seppelt Institut fiir Anorganische und Analytische Chemie, Freie Universitlt Berlin, Fabeckstrasse 34/36, D-1000 Berlin 33 (F.R.G.)

The

new

ketene

F5S-CH=C=O

can

be

prepared

in

a three

step

synthesis. H2C=C=O

+ SFSCl

F5S-CH2-COCI

>

I H20 '2'5

F5S-CH=C=O

F5S-CH2-COOH

15oOc

The

colourless

dimerises

liquid

slowly

(b.p.

with

47'C)

partial

can

be

handled

polymerisation

at

in air and

room temperature.

F5S-CH=C-0 F5S-CH=C=O

II

_____)

F5S-HC-C=O + polymer In

the

gas

forming F5S-CH=C=O

phase

a new

at

28O'C

alkylidene

isomerisation sulfur

280'Cjglass

of

the

tetrafluoride. f

F4S=CH-COF

ketene

is observed