Chloroalkyl functional siloxanes

The chloroalkyl functional siloxanes provide useful starting points for further deri-vatization. They undergo displacement of chloride ion by a variety of nucleophiles such as amines218 (equation 84) or carboxylates219 (equation 85). 

Dragan, E. S. Cazacu, M. Nistor, A., Ionic Organic/Inorganic Materials. III. Stimuli Responsive Hybrid Hydrogels Based on 01igo(N,N-dimethylamino-ethylmethacrylate) and Chloroalkyl-Functionalized Siloxanes. J. Polym. Sci., Part A Polym. Chem. 2009,47, 6801-6813. 

The siloxane sequences containing these ends have been joined to other polymeric sequences such as carbonates, ureas, urethanes, amides, and imides. Other functional groups include amines and sulfonic acids, ° ° ammonium groups, epoxides, and chloroalkyl groups. ... 

Franc and Dvoracek showed that some functional groups and bond types may be identified by degradation of the sample in a microreactor, and gas chromatographic separation of the volatile reaction products. Details of the method and apparatus are given, and results are presented for the degradation of alkyl- aryl- and chloralkyl-silanes and siloxanes (with concentrated sulphuric acid saturated with vanadium pentoxide) of alkoxysilanes (with hydriodic acid at 75 C) and of vinylsilanes (by saturation with chlorine on a water bath followed by decomposition with concentrated sulphuric acid at 175°C). Alkyl, chloroalkyl, phenyl, chlorophenyl, alkoxyl and vinyl groups, and s Si-Si s and =Si-H bonds were all detected by these procedures. 

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