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The Least Coordinating Anion

Some recent examples of the use of weakly coordinating carborane anions to isolate reactive cations include the following. Currently, the icosahedral carborane with eleven chlorine substituents, CHB 11 Cl 11 - , is the most inert, least coordinating anion for trialkylsilylium ion chemistry. Carborane anions have helped solve the "silylium ion problem".


X-ray crystallographic proof of the existence of the silylium ion in
[Si(mesityl)3+][CHB11Me5Br6-]ĚC6H6. See Kim et al. Science 2002, 297, 825.


Characterization of a nearly linear 3-center-2-electron bond
in [Me 3 Si-H-SiMe 3 + ][CHB 11 Cl 11 - ]. See Hoffmann et al. Chem. Commun. 2005, 767.


The first example of SO 2 coordination to silicon, in
Et 3 Si(SO 2 )][CHB 11 Me 5 Br 6 ]. See Hoffmann et al. Chem. Commun. 2005, 767.



The structure of the C 59 N + cation (isoelectronic to C 60 )
in [C 59 N + ][Ag(CHB 11 Cl 6 ) 2 - ]. See Kim, et al. J. Am. Chem. Soc . 2003 , 125 , 4024 .


The B(subpthalocyanine) + cation in [B(subPc) + ][CHB 11 Me 5 Br 6 - ].
See Kato et al. Heteroatom Chem. 2006, 17, 209.



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