T H E J O U R N A L OF I N D U S T R I A L A N D E N G I N E E R I N G CHEMISTRY.
284
May,
191
1,g-butadien from acetylene and ethylene a t dark glowing heat,
+ CH,
CHSCH
=
CH,
=
CH,
=
CH-CH
=
CH,.
Then he allows chlormethyl to act on the butadien, CH,
=
CH - CH = CH, CH
+ CH,Cl =
=
CH,
=
CH*
C(CH,) -
CH,.
H2C
\
/
It is interesting f o note t h a t in spite of Harries' annihilating criticism of Heinemann's process, this inventor advertises now in the chemical journals that he is ready t o furnish isopren in any quantity. It will perhaps prove of interest t o refer t o the most modern theory on the polymerization of isopren and the constitution of caoutchouc. Harries claims t h a t isopren first furnishes dimethylcyclooktadiene, which then polymerizes to india rubber, as shown by the following formula :
Ozonide of
CH
I
c--0 \
\ /
\
0
CH,
I
O=CH
/
CH,
caoutchouc.
Diperoxide.
Levulindehyd
We hope soon t o again take up this subject and give a review of all publications which describe the various processes of producing diolefins. SUGGESTIONS AS TO PUBLIC SAFETY.
CH, C
CH, , C
H
