Chemistry, 04.04.2020 07:44, rayniqueamee2002
Although aromatic substitution reactions usually occur by an electrophilic mechanism, aryl halides that have electron-withdrawing substituents can also undergo a nucleophilic substitution reaction, termed SNAr. The electron-withdrawing substituent(s) must be oriented ortho and/or para to the halogen. The reaction proceeds by nucleophilic attack of the nucleophile on the ring carbon bound to the halogen leaving group, an intermediate carbanion is formed which is termed a Meisenheimer complex. The Meisenheimer complex is stabilized via resonance by the electron-withdrawing groups. Expulsion of the halogen restores aromaticity to the ring and completes the reaction. Draw curved arrows to show the movement of electrons in this step of the mechanism.
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This chart represents the melting point of several substance. what besy explains the high melting point of the salt?
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The atom fluorine generally will become stable through the formation of an ionic chemical compound by accepting electron(s) from another atom. this process will fill its outer energy level of electrons.
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Although aromatic substitution reactions usually occur by an electrophilic mechanism, aryl halides t...
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