tetrasilabuta-1,3-diene R2Si=SiR—SiR=SiR2 (1) with HCl and HBr, slowly generated from HSiCl3 or LiBr and CF3COOH, respectively, furnish the unsymmetrically substituted disilenes R2XSi—SiR=SiR—SiHR2, X = Cl (2), Br (3), by formal 1,4-addition of the hydrogen halides to 1...
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