The Ion‐Like Supersilylium Compound
<i>t</i>
Bu
<sub>3</sub>
Si–F–Al[OC(CF
<sub>3</sub>
)
<sub>3</sub>
]
<sub>3</sub>
作者:Alexandra Budanow、Michael Bolte、Matthias Wagner、Hans‐Wolfram Lerner
DOI:10.1002/ejic.201500323
日期:2015.5
[R3Si–X–SiR3][AlOC(CF3)3}4] 1a(X): R = tBu, X = F, Cl; 1b(X): R = Me, X = F, Cl}, could not be generated under these conditions. Generally, at low temperatures (< –50 °C) the halonium salts 1a(Br), 1a(I), 1b(Br), and 1b(I) are stable compounds. However, at higher temperatures 1a(Br), 1a(I), 1b(Br), and 1b(I) undergo R3SiX (R = Me, tBu; X = Br, I) elimination to form the highly reactive silyl cations [R3Si]+
离子状甲硅烷基化合物 tBu3Si-F-Al[OC(CF3)3]3 和 Me3Si-F-Al[OC(CF3)3]3 是通过降解卤盐 [R3Si-X-SiR3][Al OC(CF3)3}4] 1a(X): R = tBu, X = Br, I; 1b(X):R = Me,X = Br,I}。从 R3SiX (R = Me, tBu) 和 [Ag][AlOC(CF3)3} 定量获得溴盐和碘盐 1a(Br)、1a(I)、1b(Br) 和 1b(I) 4] 在 –50 °C 的二氯甲烷中。然而,相关的氟盐和氯盐,[R3Si–X–SiR3][AlOC(CF3)3}4] 1a(X): R = tBu, X = F, Cl; 1b(X):R = Me,X = F,Cl},在这些条件下无法生成。通常,在低温 (< –50 °C) 下,卤盐 1a(Br)、1a(I)、1b(Br) 和 1b(I)