N-Hetorcarbene

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 found 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 unaccompanied check of electrons. Silylenes are key intermediates in various photochemical, thermal, and surface lessening reactions of organosilicon compounds.[1] Therefore, silylenes play a vital role in the athletic field of silicon chemistry.[2] Until 1994, silylenes were generally considered to be genuinely reactive rocky species that decompose or polymerize quick at temperatures preceding(prenominal) 77 K.[3] This situation changed when westernmost et al. inform the depression N-hetero cyclic silylene that is immutable at mode temper ature.[4a] Since then, a bonnie number of cyclic silylenes and a dialkyl silylene have been inform.[46] Only one example of a monochlorosilylene[6] that is stable at board temperature has been published, and it was characterized by X-ray diffraction; no dihalosilylenes that are stable at elbow room 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[7] and Schenk[8] in 1964. nigh reactions of condensed SiCl2 with acetylene and with benzene were carried out by Timms[9] in 1968, and resulted in brown polymeric products of unknown composition. A literature value reveals that there have been few reports[1012] on the synthesis and properties of cyclic and linear polydichlorosilanes. A polymeric perchloropolysilane (SiCl2)n was reported by West et al. in 1998[13] and was studied by single(a) crystal Xray diffraction. However, approach to dichlorosilylenes that are stab! le at room temperature and with electronic structure...If you requisite to get a full essay, run it on our website: BestEssayCheap.com

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