Thus it decreases the electron density on oxygen. The upcoming seminar by Prof.
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To form the corresponding phenoxide.
Electron withdrawing groups list. Weakly deactivating groups direct electrophiles to attack the benzene molecule at the ortho- and para- positions while strongly and moderately deactivating groups direct attacks to the meta- position. The same holds when the CO 2 Et group is replaced with a cyanide group. Electron withdrawing groups are assigned to similar groupings.
Compounds that contain C-O bonds each possess differing reactivity based upon the location and hybridization of the C-O bond owing to the electron-withdrawing effect of sp-hybridized oxygen carbonyl groups and the donating effects of sp 2-hybridized oxygen alcohol groups. For example when the dye contains a bromide atom the color is significantly more intense than for dyes containing the nitro group. Vasiliki Tileli of INE EPFL will take place on 25112021 at 1400.
Activating substituents favour electrophilic substitution about the ortho and para positions. The reason is the strong electron-withdrawing nature of the nitro group in relation to the bromide atom causing a hypsochromic shift. In phenol the sp 2 hybridized carbon of the benzene ring attached directly to the hydroxyl group acts as an electron-withdrawing group.
These reactions of phenols indicate its acidic nature. Phenols react with active metals such as sodium potassium etc.
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