Bellemin-Laponnaz, Stephane published the artcileSynthesis of N,O-heterocyclic carbene and coordination to rhodium(I) and copper(I), Quality Control of 1207294-92-5, the publication is Polyhedron (2010), 29(1), 30-33, database is CAplus.
5,7-Di-tert-butyl-3-Ph benzoxazolium tetrafluoroborate 1 could be prepared by simple reaction of the corresponding aminophenol with tri-Et orthoformate under acidic conditions. Both rhodium(I) and copper(I) complexes with benzoxazol-2-ylidene ligand were then efficiently synthesized in a straightforward and smooth manner involving the reaction of benzoxazolium salt 1 with metal precursor and an external base. The complexes were fully characterized and used in metal-catalyzed hydrosilylation of ketones, where they showed poor catalytic activity, presumably due to low stability of the complexes under those conditions.
Polyhedron published new progress about 1207294-92-5. 1207294-92-5 belongs to benzoxazole, auxiliary class Achiral NHCs Ligands, name is 5,7-Di-tert-butyl-3-phenylbenzo[d]oxazol-3-ium tetrafluoroborate, and the molecular formula is C21H26BF4NO, Quality Control of 1207294-92-5.
Referemce:
https://en.wikipedia.org/wiki/Benzoxazole,
Benzoxazole | C7H5NO – PubChem