Styrene bromination

For styrene [32] bromination, (23) can be applied more appropriately the curvature of the plot (Fig. 19) is not very significant when compared with that in stilbene bromination. Styrene bromination proceeds predominantly via a C carbocation intermediate and is accompanied by a bromonium ion pathway which becomes increasingly competitive as X becomes more EW the second term in (23) should reflect the bromonium ion pathway, whereas the Cp carbocation is too unstable to compete with the formation of the carbocation. Exactly the same correlation is obtained for j3-methylstyrene, Ar-CH=CH(CH3). 

Acrylonitrile-butadiene-styrene Brominated flame retardant(s) Dioctylphthalate Erucamide Ethylene glycol European Union Flame retardant(s) High-density polyethylene High-impact polystyrene Life cycle assessment Low-density polyethylene Melt flow index Municipal solid waste Molecular weight Oleamide Polyamide(s)... 

Reagents with the six electrones are good electrophiles but rather complex and require controlled reaction conditions (Scheme 5.23). Thiirane in TM 5.11 is therefore conveniently interconverted by one-bond disconnection and regioselective ring opening, and then proper FGI affords styrene as the starting material. Formation of the thiirane ring in TM 5.11 needs more synthetic steps from styrene, bromination, substitution of more reactive benzylic bromine by sulfide anions and cyclization in the last step. 

Alpha methyl- Sodium styrene Bromine numbers... 

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