The combination of inorganic polymeric networks with organic components leads to inorganic-organic polymers. A convenient method for the introduction of organic radials into an inorganic backbone is the use of organosubstituted silico esters in a polycondensation process. This leads to≡Si-O-Si≡ network containing materials, so-called organically modified silicates (ORMOSILs). For the synthesis of the inorganic backbone, in opposition to the high temperature preparation of non-metallic inorganic materials like ceramics, “soft chemistry” methods have to be applied in order to preserve organic groupings to be incorporated. Therefore, the sol-gel process is a suitable technique [1–5]. A review over basic synthesis principles and chemical methods, their effect on special material properties and the application potential will be given.
1.002 + R-R0) where R is the ratio in the sample in question and Ra is the ratio in unlabeled material. Good agreement was found between measurements of the two pairs of peaks. A fragment peak at m/e 127 is also observed, attributed to the loss of benzoyl group. The ratio 129/127 in all samples was within experimental error identical with that in unlabeled material. This establishes that the 180 label is in the carbonyl oxygen. First-order rate constants for exchange were evaluated as the slopes of plots of In (excess 180) vs. time.Acknowledgment. Continued financial support of the Natural Sciences and Engineering Research Council is gratefully acknowledged.Registry No. 2 (major isomer), 86239-10-3; 2 (minor isomer),
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