However, functionalization of porphyrin derivatives had been limited to electrophilic substitution such as halogenation
, nitration and formylation, which proceed selectively at the meso-positions in the case of meso-unsubstituted porphyrins such as 15 (Scheme 9).
does not reduce Cryptosporidiurn below the microbiological hazard of 99.
Nitration, sulfonation, amination, halogenation
, reduction, oxidation and diazotization are distinctive chemical process used in the preparation of these dyes.
Phenols and biphenol compounds with different degrees of halogenation
were also tested for binding with PPAR[gamma].
Separate chapters are included on the applications of biocatalysis in material science, catalytic antibodies, and a full array of oxidations, including Baeyer-Villiger, aromatic, oxidation of C-N bonds, oxidation of sulfur and of amino groups, and halogenation
Hydroxyl groups and benzene rings are useful functional groups located on the walls of wood cells, through which fire-retardant elements can be attached by reactions such as esterification, transesterification, etherification, and halogenation
reaction is carried out in a hydrocarbon solution such as hexane using elemental chloride and bromine (equimolar with the enchained isoprene).
is a well-known approach to high RJ materials.
In this case the halogenation
reaction is followed in the same manner as when treated with bromine water where an aqueous solution of phenol gives an immediate precipitate of 2,4,6-tribromophenol, owing to the powerfully activating influence of the negatively charged oxygen in the phenoxide ion  (figure 10).
Brown's research interests centre on electrophilic halogenation
, mechanisms of the hydrolysis of amides and esters, effects of structural distortion on the reactivity of amides and the catalysis of alcoholysis of organophosphates by transition metals and lanthanides.
NBS and NCS, as important halogenation
reagents, are used entirely as supplementary raw materials in the production of Active Pharmaceutical Ingredients (APIs) or pharmaceutical intermediate.
of 2-aminothiazoles provide facile approach to the synthetically important 2-mono-and 2,5-dihalothiazole derivatives through modified Sandmeyer conditions .