Probing the Mechanism of Aldehyde Addition to a Disilene and Two Silenes: Solvent Effects
作者:Julie A. Hardwick、Kim M. Baines
DOI:10.1021/om900673n
日期:2010.3.8
The effect of changing the solvent from a hydrocarbon to acetonitrile on the mechanism of the addition of aldehydes to a disilene and two silenes was investigated. The products of the reaction between Mes2Si═CH(CH2-t-Bu) and acetonitrile were characterized.
Stabile 1,2-silaoxetane durch umsetzung von 1,1-bis(trimethylsilyl)-2(R)-2-trimethylsiloxy-1-silaethen mit cyclopentadienonen und α-pyronen
作者:Gottfried Märkl、Michael Horn
DOI:10.1016/s0040-4039(00)81686-x
日期:——
Stable solid silaethylenes
作者:A. G. Brook、S. C. Nyburg、Fereydon Abdesaken、Brigitte Gutekunst、Gerhard Gutekunst、R. Krishna、M. R. Kallury、Yiu C. Poon、Yau Min Chang、Wong Ng Winnie
DOI:10.1021/ja00385a019
日期:1982.10
Addition of Cyclopropyl Alkynes to a Brook Silene: Definitive Evidence for a Biradical Intermediate
作者:Kaarina K. Milnes、Michael C. Jennings、Kim M. Baines
DOI:10.1021/ja057596g
日期:2006.2.1
The addition of three newly developed mechanistic probes, (trans-2-phenylcyclopropyl)ethyne, (trans, trans-2-methoxy-3-phenylcyclopropyl)ethyne, and (trans, trans-2-methoxy-1 -methyl-3-phenylcyclopropyl)ethyne, 1a-c, to a Brook silene, 2-tert-butyl-2-trimethylsiloxy-1,1-bis(trimethylsilyi)-1-silene, 10, was examined. When alkyne 1a was added to silene 10 products derived from a formal ene reaction were obtained. When alkynes 1b-c were added to silene 10, in addition to the typical silacyclobutenes, a variety of silacycloheptenes were obtained in which the cyclopropyl ring had clearly opened. Formal ene-addition products were also produced from the addition of 1b to 10. Based on the relative positions of the phenyl and methoxy substituents within the seven-membered ring of the silacyclohelptenes and the known behavior of the alkyne probes under both radical and ionic conditions, it was concluded that a biradical intermediate was formed during the addition of alkynes 1b-c to silene 10. In the addition of alkynes 1a-b to silene 10, the ene products are most likely formed by a competitive pericyclic reaction. We also present a straightforward method for the unambiguous determination of the regiochemistry of silacyclobutenes derived from the cycloaddition of terminal alkynes to silenes.
Addition of Nitriles to Two Brook Silenes
作者:Julie A. Hardwick、Kim M. Baines
DOI:10.1021/om200182q
日期:2011.5.23
The addition of acetonitrile and propionitrile to two Brook silenes, (Me3Si)(2)Si=C(OSiMe3)R where R = 1-Ad and t-Bu, was examined. Products derived from addition of the alpha-CH of the nitrile across the silicon carbon double bond were identified. The reactivity of Brook silenes and naturally polarized silenes toward nitriles is compared.