212ChemInform Abstract Thermal elimination of fluorotrimethylsilane from the boranes (III) results, in the case of (IIIa) and (IIIb), in formation of the expected iminoboranes (IVa) (space group P21/c, Z=4) and (IVb). However, the analogous iminoborane from (IIIc) rearranges to give the benzoborolane derivative (V). The iminoborane (IVc) can be obtained by the two-step reaction starting from (VI). The tri-tert.-butylphenyl-substituted iminoboranes (IV) are thermally stable at temp. of more than 200 rc C, although they are reactive. (IVa) and (IVb) form corresponding benzoborolanes of the type (V) at 350 and 250 rc C, respectively. The H acidic compounds HX (VIII) are readily added to (IVb) to give the iminoboranes (IX). The N-aryl iminoborane (XII) is also thermally stable such as (IV).
ChemInform is a weekly Abstracting Service, delivering concise information at a glance that was extracted from about 100 leading journals. To access a ChemInform Abstract of an article which was published elsewhere, please select a “Full Text” option. The original article is trackable via the “References” option.
ChemInform Abstract Reaction of the lithiated aminosilanol (I) with the silyl chloride (II) yields the siloxane (III) which is coupled with the difluorosilane (IV) to give the siloxane (Va). This and the known siloxane (Vb) are cyclized upon treatment with butyllithium and catalytic amounts of diisopropyldifluorosilane, producing the 1-oxa-3-aza-2,4-disilacyclobutanes (VI). The X-ray structural analysis of (VIb) is given.
1991organo-silicon compounds, nonmetal heterocycles organo-silicon compounds, nonmetal heterocycles S 0067
-196Additions to the Si=N Double Bond -Crystal Structure of a (SiNCO) Four-Membered Ring.-The lithiated aminofluorosilanes (I) behave like the iminosilanes (IV) giving in the reaction with benzaldehyde (II) the carboimines (III) besides cyclosiloxanes. These reactions occur by (2 + 2) cycloadditions as seen by the isolation of the products (VII). Derivative (VIIa) is characterized by an X-ray analysis. Thermal cleavage of (VIIb) yields the imine (VIII). 2-Methyl-propenal-2 reacts in a (2 + 4) and (2 + 2) cycloaddition forming the two competition products (X) and (XI). -(VOLLBRECHT, S.; KLINGEBIEL, U.; SCHMIDT-BAESE, D.
scite is a Brooklyn-based organization that helps researchers better discover and understand research articles through Smart Citations–citations that display the context of the citation and describe whether the article provides supporting or contrasting evidence. scite is used by students and researchers from around the world and is funded in part by the National Science Foundation and the National Institute on Drug Abuse of the National Institutes of Health.