Synthese von Diboraheterocyclen mit einer BC3B-Gruppierung / Synthesis of Diboraheterocycles with a BC3B Unit

Abstract

Double hydroboration of allene with HBCl2 · OEt2/BCl3 leads to 1,3-bis(dichloroboryl)-propane 1 a, in which two chlorine atoms can be substituted by HN(iPr)2 to give 1 b. Dehalogenation of 1 b with Na/K alloy yields the 1,2-diborolane 2b. Attempts to synthesize an unsaturated 2,3-dihydro-1,2-diborole 4 failed. 1 a and (Me3Si)2S react to give the 1,2,6-thiadiborinane 6 a, and 1 b and Me3C – NH2 yield the 1,2,6-azadiborinane derivative 7b.