作者:William A. Kriner
DOI:10.1016/s0022-328x(00)93608-8
日期:1977.7
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
BX 3(X = F,Cl,Br)与1,1,3,3-四甲基-1,3二硅环丁烷(I)的放热反应产生环裂解产物XMe 2 SiCH 2 Me 2 SiCH 2 BX 2(II )的数量几乎是定量的。活性顺序为BBr 3 > BCl 3 > BF 3。将结构II的化合物在180°C下加热40 h不会影响IIa(X = F),但会导致IIc(X = Br)完全重排为BrMe 2 SiCiH 2 MeBrSiCiH 2 BMeBr(IIIc)。化合物IIb(X = Cl)不完全(65%)转化为ClMe 2 SiCH 2 MeClSiCH在规定的条件下生成2 BMeCl(IIIb)。结论是,由于仅发现一种异构体,热重排最有可能通过分子内机理进行。