Silanol: definition reactions with

On the basis of available experimental data, it is impossible to choose a definite pathway of elimination of silanol. However, study of silylation of methyl P -nitropropionate (411) with BSA in the presence of trapping agents rigorously proved that silyl nitronate D is initially formed. This compound can be detected in the [3 + 2]-cycloaddition reaction with methyl acrylate product (413). If silylation of AN (411) is performed in the presence of ethyl vinyl ether, a-nitrosoalkene E can be successfully trapped in as heterodiene a Diels-Alder reaction. Dihydroox-azine (414) is formed, and its silylation affords isolable product (415). 

The equilibrium constants K corresponding to Eq. 3 have been determined in dioxane solution starting with definite concentrations of silanol or alkoxysilane, alcohol, and water and measuring the equilibrium concentrations of silanol and alkoxysilane by GC. The results given in Table 1 show that K is within the order of 0.1. This means that the silanol alcoholysis is, especially at an excess of alcohol, a reaction not to be neglected in the system mentioned above. 

Most of the research on reactive extrusion is performed in twin screw extruders, although a single-screw co-kneader has definite advantages if micromixing plays an important role. Franz (24) gave an overview of applications of reactive extrusion with a Busskneader in a paper discussing the polycondensation reaction of silanoles to produce silicon oils. Aeppli (25)... 

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