Nucleophilic (Anionic) Aromatic Substitution for a Leaving Group: (Section 17.12A. We can picture this in a general way as a heterolytic bond breaking of compound X:Y by an electrophile E such that E becomes bonded to Y by the electron pair of the XY bond. (Notice that either of the oxygens can accept the electron pair.)
The structure and properties of aromatic systems were discussed in Chapter 11. Reagents that acquire an electron pair in chemical reactions are said to be electrophilic ("electron-loving").
E E E E E H 2.) Special Topics 5 3. p-substitution than o-substitution 5) The incoming group replaces a hydrogen, it will not usually displace a substituent already in place (in the case of electrophilic aromatic substitution) Directing effect if more than one substituent is present NO2 CH3 Br CH3 CH3 b) (4 pts) Chlorobenzene is less reactive towards electrophilic aromatic substitution than …
a) Rank the following compounds according to their reactivitiy towards electrophilic aromatic substitution by numbering them from 1 to 4 where 1 is the most reactive and 4 the least reactive. 1.) A nucleophilic aromatic substitution reaction is a reaction in which one of the substituents in an aromatic ring is replaced by a nucleophile.. A Meisenheimer complex is a negatively charged intermediate formed by the attack of a nucleophile upon one of the aromatic-ring carbons during the course of a nucleophilic aromatic substitution reaction. The final will focus on material from the second half of the semester.
Experimental Procedure 1.
Compounds from fused benzene or aromatic heterocyclic rings are themselves aromatic Naphthalene: 4n+2=10, n=2 note: Hückels rule is strictly for monocyclic aromatic compound, its application to polycyclic aromatic compounds is tenuous. Electrophilic Aromatic Substitution: Friedel-Crafts Acylation Study Questions 1) A carbocation produced during a Friedel-Crafts alkylation may undergo rearrangement. Special Topics 5 3. Answer: 2) Predict the major mononitration products of methyl benzoate and of toluene. Tribromination of Phenol Reaction: Measure 50. mg of phenol into a a small test tube supported in a 100-mL beaker. Before starting the exam, check to make sure that you have all of the pages. Compounds from fused benzene or aromatic heterocyclic rings are themselves aromatic Naphthalene: 4n+2=10, n=2 note: Hückels rule is strictly for monocyclic aromatic compound, its application to polycyclic aromatic compounds is tenuous.
Electrophilic Aromatic Substitution Mechanism: Please fill in the following structures depicting the correct mechanism. The … Chem 360 Jasperse Final Exam Notes. Why will the following reaction not occur as written?
Next add 20% bromine in acetic acid solution They are representative of the types of long questions that will be on the final exam.
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The structure and properties of aromatic systems were discussed in Chapter 11. Reagents that acquire an electron pair in chemical reactions are said to be electrophilic ("electron-loving").
E E E E E H 2.) Special Topics 5 3. p-substitution than o-substitution 5) The incoming group replaces a hydrogen, it will not usually displace a substituent already in place (in the case of electrophilic aromatic substitution) Directing effect if more than one substituent is present NO2 CH3 Br CH3 CH3 b) (4 pts) Chlorobenzene is less reactive towards electrophilic aromatic substitution than …
a) Rank the following compounds according to their reactivitiy towards electrophilic aromatic substitution by numbering them from 1 to 4 where 1 is the most reactive and 4 the least reactive. 1.) A nucleophilic aromatic substitution reaction is a reaction in which one of the substituents in an aromatic ring is replaced by a nucleophile.. A Meisenheimer complex is a negatively charged intermediate formed by the attack of a nucleophile upon one of the aromatic-ring carbons during the course of a nucleophilic aromatic substitution reaction. The final will focus on material from the second half of the semester.
Experimental Procedure 1.
Compounds from fused benzene or aromatic heterocyclic rings are themselves aromatic Naphthalene: 4n+2=10, n=2 note: Hückels rule is strictly for monocyclic aromatic compound, its application to polycyclic aromatic compounds is tenuous. Electrophilic Aromatic Substitution: Friedel-Crafts Acylation Study Questions 1) A carbocation produced during a Friedel-Crafts alkylation may undergo rearrangement. Special Topics 5 3. Answer: 2) Predict the major mononitration products of methyl benzoate and of toluene. Tribromination of Phenol Reaction: Measure 50. mg of phenol into a a small test tube supported in a 100-mL beaker. Before starting the exam, check to make sure that you have all of the pages. Compounds from fused benzene or aromatic heterocyclic rings are themselves aromatic Naphthalene: 4n+2=10, n=2 note: Hückels rule is strictly for monocyclic aromatic compound, its application to polycyclic aromatic compounds is tenuous.
Electrophilic Aromatic Substitution Mechanism: Please fill in the following structures depicting the correct mechanism. The … Chem 360 Jasperse Final Exam Notes. Why will the following reaction not occur as written?
Next add 20% bromine in acetic acid solution They are representative of the types of long questions that will be on the final exam.
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