TCI B6644 1-Bromo-4-nitrosobenzene (CAS 3623-23-2) is a reactive aromatic nitroso building block available through AMI Scientific. The nitroso group serves as an electrophilic nitrogen source and heterodienophile, supporting nitroso Diels-Alder, nitroso-ene, and azo-coupling chemistry. The para-bromo substituent adds a second handle for palladium-catalysed cross-coupling and further scaffold elaboration. It is supplied in a 250 mg pack and should be stored cold, sealed, and protected from light and heat.
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