O-bromostyrenes

Fig. 5. Miscibility of poly(2,6-dimethyl phenylene oxide) (PPO) and random copolymers of styrene and o-bromostyrene (7), p-fluorostyrene (2), p-bromostyrene (i), o-chlorostyrene (4), p-chlorostyrene (5), and o-fluorostyrene (<5) for 50/50 blends. Miscibility occurs to the left of the curves (after Ref. [29])...

Alkynes (acetylenes, RCsCR) may be prepared by the elimination of a hydrogen halide from alkenyl halides under vigorous conditions. This is exemplified by the preparation of phenylacetylene from cinnamic acid via the dibromide and (o-bromostyrene (Scheme 3.26). The contrast between the conditions required for the bromodecarboxylation and for the second elimination to form the alkyne reveals the difference in reactivity between an alkyl and an alkenyl halide. Alternative modes of elimination, such as allene formation or rearrangement reactions, restrict the use of this procedure. 

Intramolecular cyclizations via aryl anions have been used to prepare benzocyclobutenes (138) from o-bromo-3-phenethyl bromides and benzocyclobutenols (139) from o-bromostyrene oxides. ... 

For example, o-bromostyrenes 39 (X = Br), under palladium catalysis, yield substituted indanes 38. Tn this case, careful variation of the conditions is necessary, to prevent the fi-hydride elimination in the intermediate to yield o-dialkenyl arenes 40 (Scheme 3-14) [81]. 

Dimethyl-l,4-phenylene ether, phenylsulfonated o-Bromostyrene-co-styrene Single Tg I had 10.9-88 mol% o-bromostyrene Vukovic et al. (1998)... 

A miscibility window was identified in the temperature-composition plane. The miscibility windows of polyphenylene oxide/orthochlorostyrene/parachlrostyrene (PPO/ oClS-pClS) and polyphenylene oxide/orthoflurostyrene-parafluorostyrene (PPO/oFS-pFS) were compared with each other. The maxima in the miscibility window of PPO/ oClS-pClS were found at the center of the composition axis, and the maxima in the PPO/oFS-pFS system were found skewed to the o-FS-rich side. The miscibility window was not observed for the PPO/o-bromostyrene and / -bromostyrene copolymer blend system. Kambour et al. [1] formulated a Flory-Huggins type theory for mixtures of homopolymers and random copolymers. They argued that such a system can be miscible for a suitable choice of the copolymer composition, without the presence of any specific interaction, because of a so-called repulsion between the two different monomers comprising the copolymer. 

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