Benzocyclobutene



Benzocyclobutene (BCB) or benzocyclobutadiene is the simplest polycyclic aromatic hydrocarbon, being composed of a benzene ring fused to a cyclobutene ring. It has chemical formula 86 and CAS number. It is antiaromatic, because it has 4n pi electrons. For this reason the compound is very reactive. It will easily dimerize or polymerize and reacts as the dienophile in Diels-Alder reactions

BCB is frequently used to create photosensitive polymers. BCB-based polymer dielectrics may be spun on or applied to various substrates for use in Micro Electro-Mechanical Systems (MEMS) and microelectronics processing. Applications include wafer bonding, optical interconnects, low-K dielectrics, or even intracortical neural implants.