Isolation and Structure of [HC{CH(SiMe<sub>3</sub>)(SnMe<sub>3</sub>)}<sub>2</sub>]<sup>+</sup>: A Remarkably Stable <i>sec</i>-Alkyl Cation
作者:Mark Schormann、Shaun Garratt、David L. Hughes、Jennifer C. Green、Manfred Bochmann
DOI:10.1021/ja026443f
日期:2002.9.1
sec-alkyl carbocation salts, [HCCH(R)SnMe3}2]+M2Cl9- (M = Zr, Hf). The compounds are thermally stable and, unlike previously isolated trialkyl carbocations, do not require superacidic media or weakly coordinating anions for stability. The crystalstructure and DFT calculations suggest polarization of the Sn substituents and hyperconjugation as the reason for the unexpected stability. The stabilizing effect
Reactivity of Silyl-Substituted Allyl Compounds with Group 4, 5, 9, and 10 Metals: Routes to η<sup>3</sup>-Allyls, Alkylidenes, and <i>s</i><i>ec</i>-Alkyl Carbocations
作者:Mark Schormann、Shaun Garratt、Manfred Bochmann
DOI:10.1021/om0491692
日期:2005.3.1
E+[C3H3(SiMe3)2-1,3]- (E = Li, K) with group 4 and group 5 metal halides gave intractable reduction products, Co(acac)3 and Ni(acac)2 reacted with K[C3H3(SiMe3)2-1,3] to give Coη3-C3H3(SiMe3)2-1,3}2 (1) and Niη3-C3H3(SiMe3)2-1,3}2 (2), respectively. The reaction of K[C3H3(SiMe3)2-1,3] with Me3SnCl afforded Me3SiCHCHCH(SiMe3)(SnMe3) (3), which reacted cleanly with TaCl5 to give η3-C3H3(SiMe3)2-1,3}TaCl4
甲硅烷基烯丙基E + [C 3 H 3(SiMe 3)2 -1,3] -(E = Li,K)的碱金属盐与第4组和第5组金属卤化物的反应生成了难处理的还原产物,的Co(ACAC)3和Ni(ACAC)2其中K反应[C 3 H ^ 3(森达3)2 -1,3],得到共η 3 -C 3 H ^ 3(森达3)2 -1,3} 2(1)和Ni η 3 -C 3 H ^ 3(SiMe 3)2 -1,3} 2(2)。K [C 3 H 3(SiMe 3)2 -1,3]与Me 3 SnCl的反应得到Me 3 SiCH CHCH(SiMe 3)(SnMe 3)(3),后者与TaCl 5干净地反应得到η 3 -C 3 H 3(SiMe 3)2 -1,3} TaCl 4(4)。用四甲基乙二胺处理该络合物导致HCl析出,烯丙基络合物转化为乙烯基亚烷基化合物Me 3 SiCH CHC(SiMe 3)TaCl 3(TMEDA)(5)。而在TACL的情况下5