R2SiR
R2SiR is a generic notation used in organosilicon chemistry to describe a silicon-centered organosilicon compound in which two substituents on silicon are identical (denoted R2) and a third substituent is another group R. The fourth substituent is not fixed and may be a variety of groups, such as a leaving group, halide, hydride, or another organic moiety. Because R is a placeholder for various organic groups, R2SiR refers to a class of related compounds rather than a single well-defined substance. The term is commonly encountered in reaction schemes and patents to indicate the presence of two identical substituents on silicon.
Structure and bonding around silicon in R2SiR is typically tetrahedral, with silicon forming four sigma bonds
Synthesis and preparation of R2SiR-type compounds are accomplished by general organosilicon methods, such as substitutions on
Reactivity of R2SiR compounds follows patterns typical of organosilanes. They may undergo hydrolysis to form silanols
Applications of R2SiR-type species appear in silicone chemistry, surface modification, and as intermediates for making more