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Substitution Reactions of Alcohols Alcohols can be used as electrophiles in nucleophilic substitution reactions. However, because the OH group is a poor leaving group, it must be converted to a good leaving group before the nucleophilic substitution reaction can take place. Alcohols are very weak electrophiles in their neutral state because the OH group is a poor leaving group. Good leaving groups form stable anions or molecules, such as a weak base. A common method to convert the OH group to a good leaving group is to protonate it. However, this requires acidic conditions that are incompatible with many functional groups. In the production of alkyl halides, this can be avoided by using phosphorus trihalides or thionyl chloride to produce a better leaving group. A frequently used method to activate an alcohol for a subsequent nucleophilic substitution reaction is to convert it to a sulfonate ester. A sulfonate ester has a very good leaving group and, therefore, readily undergoes many nucleophilic substitution reactions. Alcohol structure is a key factor in determining which substitution mechanism occurs. Primary alcohols cannot form stable carbocations and therefore react exclusively via second-order substitution reactions, which involve direct nucleophilic attack on the substrate. Tertiary alcohols form very stable carbocations and react through a first-order substitution mechanism, in which the nucleophile attacks the previously formed carbocation intermediate. Part A The simplest method to convert an alcohol to an alkyl halide is by reacting the alcohol with concentrated HCl, HBr, or HI. Complete the mechanism and draw the intermediates and final products for the reaction of 1,3-dimethylcyclohexanol with concentrated HCl. Draw all missing reactants and/or products in the appropriate boxes by placing atoms on the grid and connecting them with bonds, including charges where needed. Indicate the mechanism by drawing the electron-flow arrows on the molecules. Arrows should start on an atom or a bond and should end on an atom, bond, or where a new bond should be created. View Available Hint(s)

Substitution Reactions of Alcohols
Alcohols can be used as electrophiles in nucleophilic substitution reactions. However, because the OH group is a poor leaving group, it must be converted to a good leaving group before the nucleophilic substitution reaction can take place.
Alcohols are very weak electrophiles in their neutral state because the OH group is a poor leaving group. Good leaving groups form stable anions or molecules, such as a weak base. A common method to convert the OH group to a good leaving group is to protonate it. However, this requires acidic conditions that are incompatible with many functional groups. In the production of alkyl halides, this can be avoided by using phosphorus trihalides or thionyl chloride to produce a better leaving group. A frequently used method to activate an alcohol for a subsequent nucleophilic substitution reaction is to convert it to a sulfonate ester. A sulfonate ester has a very good leaving group and, therefore, readily undergoes many nucleophilic substitution reactions.
Alcohol structure is a key factor in determining which substitution mechanism occurs. Primary alcohols cannot form stable carbocations and therefore react exclusively via second-order substitution reactions, which involve direct nucleophilic attack on the substrate. Tertiary alcohols form very stable carbocations and react through a first-order substitution mechanism, in which the nucleophile attacks the previously formed carbocation intermediate.
Part A
The simplest method to convert an alcohol to an alkyl halide is by reacting the alcohol with concentrated HCl, HBr, or HI. Complete the mechanism and draw the intermediates and final products for the reaction of 1,3-dimethylcyclohexanol with concentrated HCl.
Draw all missing reactants and/or products in the appropriate boxes by placing atoms on the grid and connecting them with bonds, including charges where needed. Indicate the mechanism by drawing the electron-flow arrows on the molecules. Arrows should start on an atom or a bond and should end on an atom, bond, or where a new bond should be created.
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