Propargyl Derivatives with Silicon Carbon and Tin Carbon Bonds

Abstract

1-Dimethylamino-propyn-2-ylsilanes 3a [Me2Si(C≡C-CH2NMe2)2], 3b [Me(H)Si(C≡C-CH2N Me2)2], 4a [Me2(Cl)Si-C≡C-CH2NMe2], 4b [Me(H)(Cl)Si-C≡C-CH2NMe2], and 5 [Me2NCH2- C≡C-SiMe2SiMe2-C≡C- CH2NMe2] were prepared. Similarly, the 1-(pyrazol-1-yl)-propin-2-ylsilanes 6 and 7 (analogous to 3a and 5, respectively) and the tin compounds 8 [Me3Sn-C≡C-CH2-pz] (pz = pyrazol-1-yl) and 9 [Me2Sn(C≡C-CH2-pz)2] were synthesized, using the reaction of Li-C≡CCH2- pz (2-Li) with the respective chlorosilanes or tin chlorides. The compounds 3 to 9 were characterised in solution by a consistent set of 1H, 13C, 29Si and 119Sn NMR data.