Poly 4-vinyl pyridinium hydrogen

Complex formation between a polycation and a polyanion is also called polysalt formation or coacervation. If, for example, a solution of poly(sodium styrene sulfonate) (III) is added to an equimolar solution of poly(4-vinyl pyridinium hydrogen bromide), then a stoichiometric complex with respect to the side groups is formed, and this occurs at every mixing ratio (Figure... 

Figure 23-7. Coacervate formation (A and B) or solubilization (C and D) on mixing the polyanion of poly(sodium styrene sulfonate) S with poly(4-vinyl pyridinium hydrogen bromide) P or the ionene Y, or vice versa.

Pentacarbonyl(trimethylsilyl)manganese. VINYL FLUORIDES Pyridinium poly(hydrogen fluorideV-N-Bromosuccinimide. VINYLPHOSPHINES 2,4,6-Trii sopropy I benzenesulfonylhy drazine. VINYL SELENIDES Benzeneselenenyl halide-Silver nitrite. Diphosphorus tetraiodide. 

As shown in Scheme 29, aromatic and vinylic dithioester groups can be converted to trifluoromethyl groups directly by treating them with (Bu4N)H2p3-DBH (l,3-dibromo-5,5-dimethylhydantoin) (Path a) [17]. The use of NBS or NCS (Path b) in place of DBH yields a,a-difluoro sulfides 130 [17]. This fluorination can also be performed with poly(hydrogen fluoride) pyridinium (Path c) [32]. 

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