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Additio nucleophilic

The carbon atoms of azole rings can be attacked by nucleophilic (Section 4.02.1.6 electrophilic (Section 4.02.1.4) and free radical reagents (Section 4.02.1.8.2). Some system for example the thiazole, imidazole and pyrazole nuclei, show a high degree of aromati character and usually revert to type if the aromatic sextet is involved in a reaction. Othei such as the isoxazole and oxazole nuclei are less aromatic, and hence more prone to additio reactions. [Pg.42]

PherioT is sweet and bitter (XVII) as was definitely established despite a strong by-taste. From the charge distribution follows that the hydrogen of the HO-group and the carbon in 2-position, or the hydrogen in 2-position and the oxygen can function as an electrophilic/nucleophilic system (Fig. 17). Additio-... [Pg.111]

See also in sourсe #XX -- [ Pg.44 , Pg.55 , Pg.79 , Pg.80 , Pg.81 , Pg.82 , Pg.83 , Pg.84 , Pg.85 , Pg.86 , Pg.87 , Pg.88 ]



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Additio

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