Synthesis of mono and difunctional oligoisobutylenes—IV. Modification of α,ω-dichlorooligoisobutylene by reaction with maleic anhydride. Preliminary study on block polycondensation

✍ Scribed by M. Tessier; E. Maréchal

• Publisher: Elsevier Science
• Year: 1984
• Tongue: English
• Weight: 449 KB
• Volume: 20
• Category: Article
• ISSN: 0014-3057
• DOI: 10.1016/0014-3057(84)90049-1

✦ Synopsis

Thermal dehydrochlorination of a,eJ-dichlorooligoisobutylene leads to the formation of both endo and exo double bonds; endo bonds are mainly those of 4-phenyl-2,4-dimethyl-2-pentene; exo double bonds belong either to "short" end-groups. Reaction of dichlorinated oligomers with maleic anhydride

gives a mixture of oligomers with anhydride or substituted propenyl or indanic terminations. Pure ct,e~-di(2-methyl-2-propenyl)oligoisobutylene was prepared by basic dehydrochlorination of ct,o)-dichlorinated oligomer; only exo double bonds are formed. This ~t,e)-unsaturated oligomer reacts with maleic anhydride, giving an oligomeric mixture with functionality, with respect to anhydride, of 1.25 but containing endo double bonds and indane rings. When a catalyst is added (dichloromaleic anhydride), two molecules of anhydride can react with the same end of chain. Various polyamides were prepared from the ct,~o-dianhydride oligomers.