Hydroxyl reaction with

Regarding the degradation of PBDEs by white-rot fungi, the first evidence of their ability to degrade a PBDE compound corresponds to a study published by Hundt et al. [27], which studied the degradation of 4-bromo-BDE by Trametes versicolor. The degradation occurs initially by hydroxylation reaction with the possible formation of three different isomers of hydroxy-diphenyl ether followed... 

Hydroxyl reactions with CO, H2, and CH molecules may proceed by one route only... 

Some conclusions on the reaction mechanism may be drawn from the rate constants obtained. It was shown for hydroxyl reactions with saturated compounds (propane, for example) that the main reaction of OH was the hydrogen atom abstraction in the formation of water. This is an accepted point of view. However, another route is possible for reactions with unsaturated hydrocarbons, i.e., addition at the double bond. This is the case for the H atom with saturated compounds H reacts by abstraction, and with unsaturated ones by addition. 

These results were disputed, however, when Dehmlow questioned the reproducibility obtained when using catalysts 1 [12] and 2 [13]. In fact, Dehmlow reported the use of quaternary ammonium salt 3 for the asymmetric hydroxylation reaction, with promising levels of enantioselectivity [8d]. 

Secondary hydroxyl reaction with nitric acid (secondary alcohols give nitroalkanes) -1- -1-... 

Etherification (hydroxyl reaction with epoxide) has a high activation energy, so it occurs only at elevated tempemtures and is catalysed by teriary amines. 

Figure 3. Expected products and observed ratios for hydroxylation reactions with MMO from M. capsulatus (Bath).

Bhattacharyya, P.K. and K. Ganapathy, 1965. Microbial transformation of terpenes. VI. Studies on the mechanism of some fungal hydroxylation reactions with the aid of model systems. Indian J. Biochem., 2 137-145. 

FIGURE 22.19 Hydroxylation reaction. With permission from Petrovid ZS. Polymers from biological oils. Contemp Mater 2010 I-l 39-50 and Kandanarachchi P, Guo A, Petrovic Z. The hydrofoimylation of vegetable oils and model compounds by ligand modified rhodium catalysis. J Mol Catal A Chem 2002 184 65-71. 

Meier, U., H.H. Grotheer, G Reikert, and Th. Just (1985a), Study of hydroxyl reactions with methanol and ethanol by laser induced fluorescence, Ben Bunsenges. Phys. Chem., 89, 325-327. 

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