Copper(II) triflate

Copper(II) triflate is the copper(II) salt of trifluoromethanesulfonic acid (known simply as triflic acid) which has a chemical formula of Cu(OSO₂CF₃)₂, abbreviated Cu(OTf)₂. This substance, first reported in 1972,^[2] is a powerful Lewis acid. It is used as a catalyst in several organic reactions, such as the Diels–Alder reaction^[3] and cyclopropanation reactions^[4] (much like rhodium(II) acetate).

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Copper(II) triflate

Names
IUPAC name Copper(II) trifluoromethanesulfonate
Other names Copper(II) triflate
Identifiers
CAS Number	34946-82-2 Y
3D model (JSmol)	Interactive image
ChemSpider	2016731 Y
ECHA InfoCard	100.047.531
EC Number	252-300-8
PubChem CID	2734996
CompTox Dashboard (EPA)	DTXSID80894787
InChI InChI=1S/2CHF3O3S.Cu/c2*2-1(3,4)8(5,6)7;/h2*(H,5,6,7);/q;;+2/p-2 Y Key: SBTSVTLGWRLWOD-UHFFFAOYSA-L Y InChI=1/2CHF3O3S.Cu/c2*2-1(3,4)8(5,6)7;/h2*(H,5,6,7);/q;;+2/p-2 Key: SBTSVTLGWRLWOD-NUQVWONBAL
SMILES [Cu+2].FC(F)(F)S([O-])(=O)=O.FC(F)(F)S([O-])(=O)=O
Properties
Chemical formula	C2CuF6O6S2
Molar mass	361.67 g·mol−1
Appearance	white to pale blue powder
Solubility in water	very soluble, hygroscopic
Hazards
NIOSH (US health exposure limits):
PEL (Permissible)	TWA 1 mg/m3 (as Cu)[1]
REL (Recommended)	TWA 1 mg/m3 (as Cu)[1]
IDLH (Immediate danger)	TWA 100 mg/m3 (as Cu)[1]
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa). Y verify (what is YN ?) Infobox references

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