137516-89-3Relevant academic research and scientific papers
Synthesis und Structure of Bis(trimethylstannyl)- and Bis(dimethylhalostannyl)amines: The Role of the Nitrogen Lone Pair
Diemer, Stefan,Noeth, Heinrich,Polborn, Kurt,Storch, Wolfgang
, p. 389 - 400 (2007/10/02)
Monoaminostannanes RHN-SnMe3 (1) with substitutents R = tBu, Mes, 2,6-iPr2C6H3 are obtained by transmetallation from Me3SnX and RNH-Li, the distannylamines RN(SnMe3)2 (2) by transamination of Et2N-SnMe3 with RNH2, and bis(dimethylhalostannyl)amines R-N(SnMe2X)2 (8) by stannazane cleavage with BX3 (8n, o).Me2Sn(NtBuH)2, prepared from tBuNHLi and Me2SnBr2, decomposes with tBuNH2 elimination into the diazadistannetidine 4 already below room temperature.Information from multinuclear NMR spectra of type 2, 4, and 8 compounds ascertain the proposed relation between the value of the geminal coupling constant 2J(119Sn117Sn) of distannazanes and the Sn-N-Sn bond angle as determined by the X-ray structure analysis of 2c and of (8a)2 as well as the participation of the electron pair at the nitrogen atom with SnN bond lengths of 2.044 Angstroem and an Sn-N-Sn bond angle of 125.0 deg.The aryl group stands perpendicular to the Sn2N plane.These data exclude any ? interaction between the substituents. 2c, therefore, represents an example of a tertiary amine with the lone electron pair at the nitrogen in a p-type orbital.The supposed distannylamine (ClMe2Sn)2NMe (8a) is actually a dimer, whose unexpected structure contains a diazadistannetidine unit bearing two Me2SnCl2 groups at its nitrogen atoms in cis-configuration.This arrangement allows the formation of weak intramolecular SnCl bonds. Key Words: Amines, bis(trimethylstannyl)organyl-, bis(dimethylstannyl)organyl- / Bond cleavage, SnN / 1,3,2,4-Diazastannetidine, hexamethyl- / N,N'-Bis(dichlorodimethylstannane)
