To use all functions of this page, please activate cookies in your browser.
With an accout for my.chemeurope.com you can always see everything at a glance – and you can configure your own website and individual newsletter.
- My watch list
- My saved searches
- My saved topics
- My newsletter
A Silylenoid in organosilicon chemistry is a type of chemical compound with the general structure R2SiXM where R is any organic residue, X a halogen and M a metal. Silylenoid are the silicon pendants of carbenoid and both compounds have carbene or silylene like properties.
Additional recommended knowledge
Silylenoids are encountered as reactive intermediates in chemical reactions. A stable silylenoid can be prepared by reaction of a fluorobromosilane with a silyllithium compound in THF :
In this silylenoid the silicon atom is bonded with three substituents and not the usual four. X-ray diffraction shows that the Si-F bond with 170 pm is longer than usual for fluorosilanes. The F-Li bond is ionic with an estimated (in silico) positive charge of 0.88 residing on lithium and a negative charge of 0.74 on fluorine making it a t-Bu2MeSi)2SiF-, Li+.3THF salt. The Si-F bond is likewise polarized with only 10% of the charge on silicon.
When the silylenoid is irradiated or heated a disilene forms probably via a silylene intermediate. With electrophiles it reacts as an anion and with organolithium compounds it reacts as a silylene.
|This article is licensed under the GNU Free Documentation License. It uses material from the Wikipedia article "Silylenoid". A list of authors is available in Wikipedia.|