{TAIL ~ A process} for obtaining {HEAD ~ a tertiary olefin}, e.g. isobutylene in a very pure state by decomposing the corresponding ether, e.g. methyl tert 
{ TAIL ~ A process } for obtaining { HEAD ~ a tertiary olefin } , e.g. isobutylene in a very pure state by decomposing the corresponding ether , e.g. methyl tert
TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH