Syntheses and Properties of Isocyanatodisiloxanes and Their Alkoxy-Substituted Derivatives
作者:Takahiro Gunji、Akira Setogawa、Kazue Asakura、Yoshimoto Abe
DOI:10.1246/bcsj.71.2967
日期:1998.12
Isocyanatooligosiloxanes and their alkoxy derivatives were synthesized. The hydrolysis of triisocyanato(methyl)silane followed by distillation provided 1,1,3,3-tetraisocyanato-1,3-dimethyldisiloxane in good yield. The reaction of 1,1,3,3-tetraisocyanato-1,3-dimethyldisiloxane with ethanol, isopropyl alcohol, and t-butyl alcohol proceeded selectively to afford partially alkoxy substituted isocyanatodimethyldisiloxanes, (RO)n(NCO)4−nMe2Si2O (R = Et, n = 1—4; R = Pri, n = 1—4; and R = But, n = 1—2). On the other hand, the hydrolysis of tetraisocyanatosilane provided a mixture of isocyanatooligosiloxanes. Hexaisocyanatodisiloxane was isolated by distillation from the reaction mixture with some impurities produced by the disproportionation of hexaisocyanatodisiloxane on heating. The reaction of hexaisocyanatodisiloxane with alcohols provided partially alkoxy-substituted isocyanatodisiloxanes, [(RO)n(NCO)3−nSi]2O (R = Et, n = 2—3; R = Pri, n = 1—3; and R = But, n = 1—2), selectively and in high yield.
合成了异
氰酸酷二
硅氧烷及其烷
氧基衍
生物。通过
水解三异
氰酸基(
甲基)
硅烷,然后进行蒸馏,得到了 1,1,3,3-四异
氰酸基-1,3-二
甲基二
硅氧烷,收率很高。1,1,3,3-四异
氰酸基-1,3-二
甲基二
硅氧烷与
乙醇、
异丙醇和
叔丁醇的反应选择性地生成部分烷
氧基取代的异
氰酸基二
甲基二
硅氧烷,即 (RO)n(NCO)4-nMe2Si2O(R = Et,n = 1-4;R = Pri,n = 1-4;R = But,n = 1-2)。另一方面,四异
氰酸硅烷的
水解提供了异
氰酸ooligosiloxanes 的混合物。通过蒸馏从反应混合物中分离出了六异
氰酸基二
硅氧烷,其中还含有一些
杂质,这些
杂质是六异
氰酸基二
硅氧烷在加热时发生歧化而产生的。六异
氰酸基二
硅氧烷与
醇类反应后,可选择性地以高产率提供部分烷
氧基取代的异
氰酸基二
硅氧烷 [(RO)n(NCO)3-nSi]2O (R = Et,n = 2-3;R = Pri,n = 1-3;R = But,n = 1-2)。