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Reed CA, Xie Z, Bau R, et al. Closely Approaching the Silylium Ion (R3Si+). Science. 1993;262(5132):402-4doi: 10.1126/science.262.5132.402.
Reed, C. A., Xie, Z., Bau, R., & Benesi, A. (1993). Closely Approaching the Silylium Ion (R3Si+). Science (New York, N.Y.), 262(5132), 402-4. https://doi.org/10.1126/science.262.5132.402
Reed, C A, et al. "Closely Approaching the Silylium Ion (R3Si+)." Science (New York, N.Y.) vol. 262,5132 (1993): 402-4. doi: https://doi.org/10.1126/science.262.5132.402
Reed CA, Xie Z, Bau R, Benesi A. Closely Approaching the Silylium Ion (R3Si+). Science. 1993 Oct 15;262(5132):402-4. doi: 10.1126/science.262.5132.402. PMID: 17789946.
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Science. 1993 Oct 15;262(5132):402-4. doi: 10.1126/science.262.5132.402.

Closely Approaching the Silylium Ion (R3Si+).

Science (New York, N.Y.)

C A Reed, Z Xie, R Bau, A Benesi

PMID: 17789946 DOI: 10.1126/science.262.5132.402

Abstract

The crystal structure of the tri-isopropyl silyl species, i-Pr(3)Si(Br(6)-CB(11)H(6)), where the brominated carborane Br(6)-CB(11) H(6)(-) is perhaps the least nucleophilic anion presently known, has revealed the highest degree of silylium cation character (R(3)Si(+)) yet observed. The average C-Si-C angle is 117 degrees , only 3 degrees short of the planarity expected of a pure silylium ion(120 degrees ). This value compares to 114 degrees recently reported for a toluene-solvated silyl cation, [Et(3)Si(toluene)](+) by Lambert and co-workers. The greater silylium ion character of i-Pr(3)Si(Br(6)-CB(11)H(6)) versus [i-Pr(3)Si(toluene)](+) is also reflected in the larger downfield shift of the silicon-29 nuclear magnetic resonance, 109.8 versus

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