Add time:07/30/2019         Source:sciencedirect.com

The exothermic reaction of BX3 (X = F, Cl, Br) with 1,1,3,3-tetramethyl-1,3disilacyclobutane (I) gave the ring-cleavage product XMe2SiCH2Me2SiCH2BX2 (II) in almost quantitative yield. The order of activity was BBr3 > BCl3 > BF3. Heating compounds of structure II at 180°C for 40 h did not affect IIa (X = F) but caused a complete rearrangement of IIc (X = Br) to BrMe2SiCiH2MeBrSiCiH2BMeBr (IIIc). Compound IIb (X = Cl) was incompletely (65%) converted to ClMe2SiCH2MeClSiCH2BMeCl (IIIb) under the stated conditions. It was concluded that the thermal rearrangement most likely proceeded by an intramolecular mechanism since only one isomer was found.

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