2-Chloro-3-ethylbenzoxazolium Tetrafluoroborate TCI C0905

Chemical Identity

CAS No.: 63212-53-3
PubChem: CID 2724240·SID 87565961
Formula: C9H9BClF4NO
Molecular weight: 269.43 g/mol
Purity: >97.0%(N)(T)
Storage: <0°C

Full identifiers (IUPAC, SMILES, InChIKey)

IUPAC: 2-chloro-3-ethyl-1,3-benzoxazol-3-ium tetrafluoroborate
SMILES: [B-](F)(F)(F)F.CC[N+]1=C(OC2=CC=CC=C21)Cl
InChIKey: MLQZANYFUYLJRK-UHFFFAOYSA-N
MDL: MDL00011943

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TCI C0905 2-Chloro-3-ethylbenzoxazolium Tetrafluoroborate (CAS 63212-53-3) is a benzoxazolium salt used as an activating condensation reagent in organic synthesis. Its highly electrophilic C-2 position enables carboxylic acid activation, allowing amide and ester bond formation under comparatively mild conditions. The reagent is also applied to dehydration reactions and to lactone or lactam ring closure where sensitive substrates are involved. Because it is moisture sensitive, AMI Scientific recommends handling under dry or inert conditions and storing the sealed container in a cool, dry place.