Aromatic amines chlorinated

This reaction is reported to proceed at a rapid rate, with over 25% conversion in less than 0.001 s [3]. It can also proceed at very low temperatures, as in the middle of winter. Most primary substituted urea linkages, referred to as urea bonds, are more thermally stable than urethane bonds, by 20-30°C, but not in all cases. Polyamines based on aromatic amines are normally somewhat slower, especially if there are additional electron withdrawing moieties on the aromatic ring, such as chlorine or ester linkages [4]. Use of aliphatic isocyanates, such as methylene bis-4,4 -(cyclohexylisocyanate) (HnMDI), in place of MDI, has been shown to slow the gelation rate to about 60 s, with an amine chain extender present. Sterically hindered secondary amine-terminated polyols, in conjunction with certain aliphatic isocyanates, are reported to have slower gelation times, in some cases as long as 24 h [4]. 

Peroxides oxidize TPDD to Wurster s blue, a product with a semiquinone diimine structure [1]. Similarly Wurster s blue is also produced from TPDD by reaction with halogen-containing substances produced by the reaction of aromatic amines and triazines with chlorine gas. 

The chromatogram is freed from mobile phase, lightly but homogeneously sprayed with the spray solution or immersed in the dipping solution for 2 s. Triazines and aromatic amines must first be converted to chlorinated derivatives by exposing the chromatogram to chlorine gas (see Procedure Tested ). 

The novel chlorinated fluorescein succinimidyl esters 52 and 53 are considerably stable if properly stored. They exhibit intermediate reactivity toward amines, with high selectivity toward aliphatic amines. Their reaction rate with aromatic amines, alcohols, phenols, and histidine is relatively low. 

Sulfur atom as internal nucleophile. In this area, it has been shown that the reaction of 8-bromo-l,3-dimethyl-7-(2,3-epithiopropyl)xanthine 147 with a range of aliphatic and aromatic amines generates efficiently 2-amino-substituted 2,3-dihydro-thiazolo[2,3-/]xanthine derivatives 148. The process involves a sequential amine-induced thiirane ring opening followed by thiolate z/MYi-substitution of chlorine atom (Equation 66) <1994PCJ647>. 

The fate of dissolved amines during disinfection of water by chlorination was determined by membrane injection MS. Aliphatic amines undergo TV-chlorination to exhaustion of the N-H atoms by one of the tentatively proposed paths shown in reaction 28. Aromatic amines undergo mainly ring substitution however, the possible intervention of N-C1 intermediates is not excluded. At pH 10.6 aniline chlorination is much slower than that of n-butylamine383. 

Unsatisfactory against aldehydes, aromatic amines, esters, ethers, ketones, polyglycol ethers, aliphatic and aromatic hydrocarbons, chlorinated solvents, insecticides, essential oils Possible for special grades... 

They are attacked by aromatic hydrocarbons, chlorinated solvents, ketones, esters, phenols, aldehydes, amines. 

Solvents Polysulfones resist acids at medium concentrations, alcohols, aliphatic hydrocarbons, greases, oils, gasoline, chlorine water They are attacked by aromatic hydrocarbons, chlorinated solvents, ketones, esters, phenols, aldehydes, amines Good to limited resistance against oils, greases, aliphatic hydrocarbons, certain alcohols Unsatisfactory against aldehydes, esters, ethers, ketones, aromatic hydrocarbons, chlorinated solvents, amines, certain alcohols, phenols. .. 

Chemical behaviour is generally satisfactory with water, detergents, acids, bases, alcohols and amines but is limited to unsatisfactory versus aliphatic and aromatic hydrocarbons, chlorinated solvents, oils, fuels, and unleaded petrol. 

Environmental applications of HRP include immunoassays for pesticide detection and the development of methods for waste water treatment and detoxification. Examples of the latter include removal of aromatic amines and phenols from waste water (280-282), and phenols from coal-conversion waters (283). A method for the removal of chlorinated phenols from waste water using immobilised HRP has been reported (284). Additives such as polyethylene glycol can increase the efficiency of peroxidase-catalyzed polymerization and precipitation of substituted phenols and amines in waste or drinking water (285). The enzyme can also be used in biobleaching reactions, for example, in the decolorization of bleach plant effluent (286). 

SCHEME 185. Chlorination and bromination of aromatic amines, hydrocarbons and naphthols with in situ generated active halogen... 

Chlorine is displaced from 24 (Scheme 33) by reaction with primary and secondary aromatic amines to yield 131, although reaction with 2-... 

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