ChemInform Abstract: Environmentally Friendly Catalysis Using Supported Reagents: The Fast and Selective Bromination of Aromatic Substrates Using Supported Zinc Bromide.

Abstract

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Molecular Borromean Rings Based on Dihalogenated Ligands

“…o-Dibromobenzene is a main by-product in the preparation of p-dibromobenzene. 47 Similar to p-dibromobenzene, o-dibromobenzene also has low solubility in water, but o-dibromobenzene cannot force transformation of 6-BRs to its corresponding MR, which was confirmed by NMR (Figure S65). So, p-dibromobenzene and o-dibromobenzene can be separation by 6-BRs (Figure S66; for details, see the Experimental Procedures), which is checked by GC-MS (Table S2 and Figure S68).…”

Environmentally-Benign and Rapid Bromination of Industrially-Important Aromatics Using an Aqueous CaBr2−Br2System as an Instant and Renewable Brominating Reagent

“…A variety of new bromination techniques have been employed along with the conventional reagent "bromine" to increase the efficiency and selectivity. Examples are Br 2 / SO 2 Cl 2 , 3 Br 2 /SbF 3 /HF, 4 Br 2 /Ag 2 SO 4 , 5 Br 2 /H 2 O 2 , 6 Br 2 /H 2 O 2 / LDH-WO 4 , 7 Br 2 -silica or clay supported ZnBr 2 , 8 etc. However, the use of toxic/corrosive materials (SO 2 Cl 2 , SbF 3 /HF, H 2 O 2 ) or volatile organic solvents and discharge of hazardous HBr waste as effluent makes these processes cumbersome with respect to (wrt) both industrial and environmental viewpoints.…”