Ditelluride polymers

Takagi, K., et al. (1999). Controlled radical polymerization of styrene utilizing excellent radical capturing ability of diphenyl ditelluride. Polym. Bull. (Berlin), 45(2-3) 143-150. 

Nogami et aL [%S] prepared many aliphatic ditelluride polymers by condensing dihalides (x = 2-20) with alkali metal ditelluride ... 

Similarly, the biphenylene derivative was prepared by starting with 4,4 -dib-romodiphenyl. The X-ray diffraction of these two polymers proved them to be amorphous [235]. Conversely, other work [236] reported the mdting point of poly(p-phenylene ditelluride) to be 158 C with decomposition around 390°C Both phenyl and biphenylene ditelluride polymers exhibited dicrtcKX>nductivity upon irradiation by near-infirared light at around 1000 nm. The d xrkal conductivities of these pcdymers increased from insulators (10 Scm ) to... 

To summarize, it may be said that the disulfide, diselenide and ditelluride polymers are not cmly attractive industrially important materials but they also exhibit interesting chemistry jud mg from what little is known about thenr... 

Kishore, K. and Ganesh, K Polymers Containing Disulfide, Tetrasulfide, Diselenide and Ditelluride Linkages in the Main Chain. Vol. 121, pp. 81-122. 

Recently, Kondo and coworkers reported on the polymerization of St with diphenyl diselenides (37) as the photoiniferters (Eq. 39) [ 162]. In the photopolymerization of St in the presence of 37a and 37b, the polymer yield and the molecular weight of the polymers increased with reaction time. The chain-end structure of the resulting polymer 38 was characterized. Polymer 38 underwent the reductive elimination of terminal seleno groups by reaction with tri-n-butyltin hydride in the presence of AIBN (Eq. 40). It also afforded the poly(St) with double bonds at both chain ends when it was treated with hydrogen peroxide (Eq. 41). They also reported the polymerization of St with diphenyl ditelluride to afford well-controlled molecular weight and its distribution [163]. 

When heated in dimethylformamidc at 140-150° sodium ditelluride and 1,4-diiodobenzene produced a black, amorphous polymer that decomposed at 230-25005. 

Ditellurane (26) is formed in 11-15% yield from 1,4-diiodobutane and freshly prepared disodium ditelluride in a water-benzene system containing a phase transfer agent (Equation (2)). Unfortunately, the yield is low and the product is accompanied by a polymer [Te2(CH2)4] <88JOM(338)9>. 

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