Angewandte DOI: 10.1002/anie.200901766 Chemie Silicon Chemistry Lewis Base Stabilized Dichlorosilylene** Rajendra S. Ghadwal, Herbert W. Roesky,* Sebastian Merkel, Julian Henn, and Dietmar Stalke* dedicated to Professor Yitzhak Apeloig The chemistry of silicon is mainly ground on silicon(IV), whereas that of silicon(II) is still in its infancy. Silylene (R2Si:) is a molecule with a bivalent neutral silicon atom having a l ily(prenominal) check of electrons. Silylenes are key intermediates in various photochemical, thermal, and surface lessening reactions of organosilicon compounds. Therefore, silylenes play a vital role in the athletic field of silicon chemistry. Until 1994, silylenes were generally considered to be genuinely reactive rocky species that decompose or polymerize pronto at temperatures preceding(prenominal) 77 K. This situation changed when westernmost et al. inform the foremost N-hetero cyclic silylene that is immutable at mode tem perature.[4a] Since then, a bring together number of cyclic silylenes and a dialkyl silylene have been report. Only one example of a monochlorosilylene that is stable at style temperature has been published, and it was characterized by X-ray diffraction; no dihalosilylenes that are stable at populate temperature have been reported to date.
Gaseous dichlorosilylene has been known for many geezerhood; at room temperature, it condenses to polymeric (SiCl2)n. Its properties were already studied by Schmeisser and Schenk in 1964. nigh reactions of condensed SiCl2 with acetylene and with benzene were carried out by Timms in 1968, and resulted in brown poly! meric products of unknown composition. A literature value reveals that there have been few reports on the synthesis and properties of cyclic and linear polydichlorosilanes. A polymeric perchloropolysilane (SiCl2)n was reported by West et al. in 1998 and was studied by integrity crystal Xray diffraction. However, approach to dichlorosilylenes that are stable at room temperature and with electronic structure...If you requisite to get a full essay, site it on our website: OrderCustomPaper.com
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