Sven Dielkus

Reaktion von konjugierten doppelbindungsystemen mit dihalogen(diorganylamino)boranen und Na/K-legierung

The reaction of 2,3-dimethylbuta-1,3-diene or 2-methylbuta-1,3-diene with Na/K-alloy and dichloro(diisopropylamino)borane in n-hexane yielded the 1-bora-cyclopent-3-enes, A and II, and 1-bora-cyclonona-1,3-diene, I, respectively. Cycloocta-3,7-diene reacts with dibalogeno(diorganylamino)boranes and Na/K-alloy in n-hexane to yield the 9-bora-bicyclo[4,2,1]non-7-enes III, V, VI and the 1,6-bis(diorganylaminofluoroboryl)-cyclooct-7-enes IV and VH. When 1,2-dimethoxyethane was the solvent, only the dimeric cyclooctene, C, was obtained. The compounds were characterized by elemental analyses and spectroscopy [MS; NMR (1H, 11B, 13C, 19F)]. An X-ray analysis is presented for I, MNDO-calculations have been carried out for III and III★.

Synthese und Kristallstruktur des 2.4-Di-terf-butoxy-2,4-di-terfbutylcyclodisilazans / Synthesis and Crystal Structure of 2.4-Di-terf-butoxy-2,4-di-terrbutylcyclodisilazane

Abstract Me3CSiHal3 react with LiOCMe3 to give Me3CO(Me3C)SiHal2 (HaI = F (1), Cl (3)). The aminofluorosilane, Me3CO(Me3C)SiFNH2 (2), is formed in the reaction of 1 with LiNH2. The diaminosilane Me3CO(Me3C)Si(NH2)2 (4) is obtained from the reaction of 2 with ammonia. 4 reacts with LiC4H9 to give the lithium derivative Me3CO(Me3C)Si(NHLi)NH2 (5). In a molar ratio 1:1 the reaction of 5 and 1 leads to the formation of the 1-amino-3-fluoro-disilazane Me3CO(Me3C)SiF- NH - SiNH2(CMe3)OCMe3 (6) and in a molar ratio 2:1 to the four-membered silicon nitrogen ring [Me3CO(M e3C)Si-NH]2 (7). The crystal structure of 7 was determined.