Syntheses and Properties of Sila-functional Oligosiloxanes: A Simple and Practical Method for the Synthesis of 1,1,3,3-Tetra-isocyanato-1,3-disubstituted Disiloxane

The titled disiloxanes with the substituents of methyl, vinyl, phenyl, and isocyanato group were synthesized in excellent yields by a vapor phase hydrolysis of the corresponding isocyanatosilanes using a simple reaction apparatus. The process would provide a practical method for the syntheses of not only the sila-functional disiloxanes but also the other oligosiloxanes with various functional groups.