2,6-dibromo-4-chlorophenol

The polymers prepared by Hunter from polyhalophenols were undoubtedly highly branched. He examined the decomposition of salts of 2.6-dibromo-4-chlorophenol, 2.6-dichloro-4-bromophenol and 2.6-diiodo-4-chlorophenol (44). By analysis of the resulting polymers he was able to determine qualitatively (Table 6) the order of reactivety of the halogens (I>Br>Cl) and furthermore established that considerable reaction occurs through the o-position. 

Bromo-2-chlorophenol, see Profenofos 2-Bromo-3-chloropropanol, see l,2-Dibromo-3-... 

Preferably, however, the crude hydroxy sulfonic acids are halogenated in nitrobenzene-sulfuric acid. This affords yields of about 70% of 2,6-dichloro- or 2,6-dibromo-phenol, 72% of o-chlorophenol, or 46.5% of 0-bromophenol.450... 

Hexamethylenelmlne Methoxy PEG-10 intermediate. Insect repellents Hexahydrophthallc anhydride intermediate. Insecticides Allyl chloride Arsenic trichloride Benzophenone n-Butylamine t-Butylamine Cashew nut shell oil m-Chloroaniline 4-Chloro-3-nitrobenzotrifluoride 4-Chlorophenol Cumyl phenol Cyclopentanone 2,3-Dibromo-1 -propanol Dibutylamine Dicyclopentadiene Dinonyl phenol... 

The two isomeric sulfonyl chlorides 134 and 135 were obtained in approximately equal amounts and the additional o-sulfonation may occur by an intramolecular mechanism. The chlorosulfonation of 2,6-dihalophenols by chlorosulfonic acid and the subsequent condensation of the 4-sulfonyl chloride with secondary amines, e.g. A/-methylaniline, yields sulfonjunides, like 3,5-dibromo-4-hydroxy-iV-methylphenylsulfonamide, which is an effective herbicide against wild oats. The various dichlorohydroxybenzenesulfonyl chlorides were converted into sulfonamides, hydrazides and azides for screening as novel biocides. o-Chlorophenol 136, by heating with chlorosulfonic acid (eight equivalents) at 100°C (1 hour), gave the 1,3-disulfonyl chloride 137 (59%) (Equation 44). 

H-2J-Benzoxathiol-3-ylidene)bis[2-bromo-6-chlorophenol, -dioxide, 9CI. 3,3-Bis 3-bromo-5-chloro-4-hydroxyphenyl)-3H-2,l-benzoxathiole S,S-dioxide. 3,3 -Dibromo-5,5 -dichlorophenolsulfonephthalein [2553-71-1]... 

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