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4-Aminobenzocyclobutene can be used as a starting material for the synthesis of novel BCB-functionalised monomers. It is synthesised by subjecting a siloxane containing a dianhydride to an imidisation reaction with 4-aminobenzocyclobutene. The resulting BCB monomer exhibits good solubility in common organic solvents such as ethanol, acetone and dichloromethane. They were converted into cross-linked polymers via ring-opening and the subsequent Diels–Alder reaction at an appropriate temperature. The resulting BCB polymers (BCB resins) exhibit good thermal stability, excellent dielectric properties, low water absorption and good flatness.[1]

4-Aminobenzocyclobutene is prepared from 4-bromobenzocyclobutene using Cu₂O as a catalyst^[1].

[1] Jun Yang. (2013). Synthesis and properties of novel benzocyclobutene-functionalized siloxane thermosets. Polymer International, 62 12, 1684–1691. https://doi.org/10.1002/pi.4467