| http://www.w3.org/ns/prov#value | - The alkoxy group is the most preferred hydrolyzable group and particularly preferredcompounds are thus of the structure (RO).sub.3 SiR'Z wherein (RO).sub.3 SiR'- is a silyl moiety, R is lower alkyl radical of one to four carbon atoms, preferably one or two, i.e., methoxy, ethoxy, lower acyl of 2 to 5 carbon atoms, preferably 2 or 3,i.e., acetyl or propionyl, R' is a divalent organic bridging radic
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