Fluorine-containing main group element

Main group elements and organic compounds have catalytic activity in epoxidation with activated oxidants. They could be alternatives to catalysts containing expensive or toxic transition metals. The earliest work was carried out with fluorinated acetone, alkyl metaborate esters, and organic derivatives of arsenic and selenium (Fig. 1.2a-d) (Table 1.8). 

NMR spectra, and chemical analysis by X-ray fluorescence, the five samples El to E5 are dioctahedral 2 1 layer silicates, mainly constituted of Si and Al as framework-forming elements, containing Al for Si substitutions in tetrahedral layers and fluorine for hydroxyl groups substitutions. 29Si MAS NMR spectroscopy gives rise to their (Si/AI)iv tetrahedral ratio with a good reliability (Table 10-5). The well-controlled and well-known hydrogels composition indicates that only dioctahedral layer silicates, with two Al and one vacancy per... 

Nowadays, fluorine, the most electronegative element, plays a key role in pharmaceutical, agrochanical and material sciences. About 20 % of all pharmaceuticals and about 30 % of agrochanicals imder development or recently introduced on the market contain fluorine. Although mainly single fluorine atoms or a trifluoromethyl group have been introduced in various molecitles, the introduction of (difluoromethoxy)- or (trifluoromethoxy) aryl fragments into CTop production products was also realized [1]. 

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