3,6-Dibromothieno[3,2-b]thiophene (TT36), CAS number 392662-65-6, is a derivate of thieno[3,2-b]thiophene with bromine function groups at the 3,6-positions of the fused rings. TT36 is a widely used intermediate to build up more complex structures as semiconducting molecules, oligomers and conjugated polymers for OFETs, sensors, OLEDs and OPVs.
Interestingly, 3,6-dibromothieno[3,2-b]thiophene is prepared by the halogen dance reaction of 2,5-dibromothieno[3,2-b]thiophene with lithium diisopropyl amide (LDA), shown above.
3,6-Dibromothieno[3,2-b]thiophene has a good planar symmetrical structure and functional groups that can be easily modified to optimize the electronic properties. Alkylation or arylation of thieno[3,2-b]thiophene at 3.6-positions can be achieved via Negishi cross-coupling reaction by reacting 3,6-Dibromothieno[3,2-b]thiophene with RMBr (R = alkyl or aryl, M = Zn).