Silanes phenyl-triethoxysilane

Adsorbed films of ethykriethoxysilane and vinyltriethoxy-silane were formed on silica and alumina by retraction from hydrocarbon solution and their wettabilities and water-stabilities determined. The vinyltriethoxysilane films were generally more oleophobic, more hydrophobic and more resistant to contact with water than the films formed by the ethyl analog. Neither adsorbate formed stable films on a-alumina. The addition of low molecular weight organic acids or bases to the adsorbate solution resulted in both the ethyl and vinyl compound forming hydrophobic and water-stable films on silica and ot-alumina. Films of p-chloro-phenyl-ft-ethyltrichloro, -trimethoxy, and -triethoxysilane were also studied and found to be water-stable and to have wettabilities characteristic of a surface comprised of closely-spaced p-chlorophenyl groups. 

Rhodium-siloxide complex [ (diene)Rh(p-OSiMe3) 2] (I) appeared to be a very effective catalyst of the hydrosilylation of various allyl ethers for example, hydrosilylation of allyl glycidyl ether, allyl butyl ether, allyl phenyl ether and allyl benzyl ether [9] proceeds almost quantitatively even at room temperature (Table 1). The hydrosilylation of allyl glycidyl ether by triethoxysilane leads to glycidoxypropyltriethoxysilane, which is a commercially important silane coupling agent. The reaction of allyl ethers with hydrosiloxanes catalyzed by I also occurs with very high yield (Table 2) [10]. The hydrosilylation products have applications in the cosmetic industry [11]. 

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