Home >
Community >
How do I draw the SN2 mechanism with 1-bromo-2-methylpropane and NaOH?
Upvote
18
Downvote
+ Chemical reactions
+ Sodium hydroxide
+ Chemistry
+ Organic chemistry
+ Mechanisms
Posted by
ADRIANA
How do I draw the SN2 mechanism with 1-bromo-2-methylpropane and NaOH?
There’s an OH- group attacking the carbon bonded to Br from 180º of Br. Then they’re through a transition phase where the bond formed gives energy for the breaking of the C-Br bond. Then OH bonds with C, Br- is kicked out. Residue is NaBr.
There’s an OH- group attacking the carbon bonded to Br from 180º of Br. Then they’re through a transition phase where the bond formed gives energy for the breaking of the C-Br bond. Then OH bonds with C, Br- is kicked out. Residue is NaBr.
The most convenient way of doing so is to check the bulkiness of the carbon atom on which the reaction occurs i.e. the carbon atom on which the leaving group is attached. If the carbon is less bulky i.e. attached to only one other carbon atom while the rest of the valency is fulfilled by hydrogen, then SN2 reaction is most likely to occur. If the carbon atom is either bulky, or there is a possibility that the carbocation formed on that carbon atom will be stable enough, then SN1 is more likely to occur. The prediction might sometimes depend on the medium of reaction as well, but only in rare cases.
The most convenient way of doing so is to check the bulkiness of the carbon atom on which the reaction occurs i.e. the carbon atom on which the leaving group is attached. If the carbon is less bulky i.e. attached to only one other carbon atom while the rest of the valency is fulfilled by hydrogen, then SN2 reaction is most likely to occur. If the carbon atom is either bulky, or there is a possibility that the carbocation formed on that carbon atom will be stable enough, then SN1 is more likely to occur. The prediction might sometimes depend on the medium of reaction as well, but only in rare cases.
First of all prepare 0.1 normal or molar NaOH solution by dissolving 4 gm NaOH in 1000 ml or 2 gm NaOH in 500 ml of distilled water. Now dissolve 2 gm of Na2CO3 in 100 ml 0.1 normal or molar NaOH solution prepared above.
First of all prepare 0.1 normal or molar NaOH solution by dissolving 4 gm NaOH in 1000 ml or 2 gm NaOH in 500 ml of distilled water. Now dissolve 2 gm of Na2CO3 in 100 ml 0.1 normal or molar NaOH solution prepared above.
In SN1 we see that intermediate of the reaction is the carbocation formation. The ease of carbocation favours the reaction. So, focus on the stability of carbocation.
Now, coming to your example, alongside of bromine there are 3 (+I)prevailing groups (2-CH3 & 1-CH2CH3 ). So the reaction favours to the carbocation formation. So, here SN1 takes priority over SN2.
In SN1 we see that intermediate of the reaction is the carbocation formation. The ease of carbocation favours the reaction. So, focus on the stability of carbocation.
Now, coming to your example, alongside of bromine there are 3 (+I)prevailing groups (2-CH3 & 1-CH2CH3 ). So the reaction favours to the carbocation formation. So, here SN1 takes priority over SN2.
The SN2 mechanism is a one-step process in which a nucleophile attacks the substrate, and a leaving group, L, departs simultaneously. Because the reaction occurs in one step, it is concerted. The substrate and the nucleophile are both present in the transition state for this step.
The term SN2stands for Substitution reaction, Nucleophilic, 2nd order (also called bimolecular). According to the SN2 mechanism, there is a single transition state because bond-breaking and bond-making occur simultaneously. ...
Stronger nucleophiles are said to have increased nucleophilicity.
Mechanism SN2 reaction- The general form of theSN2 mechanism is as follows:
The SN2 mechanism is a one-step process in which a nucleophile attacks the substrate, and a leaving group, L, departs simultaneously. Because the reaction occurs in one step, it is concerted. The substrate and the nucleophile are both present in the transition state for this step.
The term SN2stands for Substitution reaction, Nucleophilic, 2nd order (also called bimolecular). According to the SN2 mechanism, there is a single transition state because bond-breaking and bond-making occur simultaneously. ...
Stronger nucleophiles are said to have increased nucleophilicity.
Mechanism SN2 reaction- The general form of theSN2 mechanism is as follows:
SN2 reaction is called as Nucleophilic substitution reaction 2.
A nucleophile (electron excess specie, a negatively charged specie) attacks the substrate and displaces the leaving group .
This reaction is a single step reaction and involves a transition state but no intermediate formation .
Difference between a transition state and an intermediate- transition state is short lived and cannot exist in it's own while an intermediate is itself a whole species and it is stable enough to live for a longer time. Also in transition state the new bond formation and old bond breaking takes place simultaneously while an intermediate like carbocation is formed when the bond breaks.
SN2 reaction is a second order reaction which means the rate of reaction depends on both the concentration of substrate and the nucleophile (the attacking specie.)
SN2 reaction is called as Nucleophilic substitution reaction 2.
A nucleophile (electron excess specie, a negatively charged specie) attacks the substrate and displaces the leaving group .
This reaction is a single step reaction and involves a transition state but no intermediate formation .
Difference between a transition state and an intermediate- transition state is short lived and cannot exist in it's own while an intermediate is itself a whole species and it is stable enough to live for a longer time. Also in transition state the new bond formation and old bond breaking takes place simultaneously while an intermediate like carbocation is formed when the bond breaks.
SN2 reaction is a second order reaction which means the rate of reaction depends on both the concentration of substrate and the nucleophile (the attacking specie.)
As the carbon of alkyl halide (RX) is electrophilic or electron deficient , owing to polarity of C - X( Carbon -Halogen bond) , the electron deficient carbon is prone to be attacked by the Electron rich species called Nucleophiles.
Thus alkyl halides(RX) undergoNucleophilic substitution (SN) reactions , with one nuclephile replacing or substituting a weak nucleophile, ie good leaving group
(SN2) mechanism
SN2 means S-Substittution, N-Nucleophilic , 2-Bimolecular.
SN2 mechanism, In the picture depicted below , Alkyl halide shown as CabdX, reacts with a Electron rich reagent species i.e Nucleophile (Nu:-) .
It may be noticed in the 1st SN2 step, the nuclophile (Nu:-), using it's excess electrons, attacks electron deficient carbon of Alkyl halide (CabdX) from backside, followed by C - X bond transfer towards a good Leaving group (X) and thereby forms an intermediate called Transition state.
This is a slow or rate determining step , as this step decides the fate of the entire reaction.
Here in the Transition state , a new C-- Nu bond begins to form , while C-- X bond begins to break and the same may be shown as dotted lines in the picture.
In step 2, the Halo group(X), being a good leaving group, leaves transition state with lone electron pairs as X:- along with the product(CabdNu).
Here in the entire mechanism , a strong Nucleophile (Nu:-) , substitutes a good leaving group (X), as a weak Nucleophile(X:-)
Since , a strong nucleophile (Nu:-) ,substitutes a weak nucleophile (X:-) , with the involvement of 2 species i.e CabdX(alkyl halide) & Nu:-(Nucleophile), the reaction mechanism is said to be a SN2 Mechanism , conveying the following meaning S-Substitution, N -Nucleophilic & 2-Bimolecular.
As the carbon of alkyl halide (RX) is electrophilic or electron deficient , owing to polarity of C - X( Carbon -Halogen bond) , the electron deficient carbon is prone to be attacked by the Electron rich species called Nucleophiles.
Thus alkyl halides(RX) undergoNucleophilic substitution (SN) reactions , with one nuclephile replacing or substituting a weak nucleophile, ie good leaving group
(SN2) mechanism
SN2 means S-Substittution, N-Nucleophilic , 2-Bimolecular.
SN2 mechanism, In the picture depicted below , Alkyl halide shown as CabdX, reacts with a Electron rich reagent species i.e Nucleophile (Nu:-) .
It may be noticed in the 1st SN2 step, the nuclophile (Nu:-), using it's excess electrons, attacks electron deficient carbon of Alkyl halide (CabdX) from backside, followed by C - X bond transfer towards a good Leaving group (X) and thereby forms an intermediate called Transition state.
This is a slow or rate determining step , as this step decides the fate of the entire reaction.
Here in the Transition state , a new C-- Nu bond begins to form , while C-- X bond begins to break and the same may be shown as dotted lines in the picture.
In step 2, the Halo group(X), being a good leaving group, leaves transition state with lone electron pairs as X:- along with the product(CabdNu).
Here in the entire mechanism , a strong Nucleophile (Nu:-) , substitutes a good leaving group (X), as a weak Nucleophile(X:-)
Since , a strong nucleophile (Nu:-) ,substitutes a weak nucleophile (X:-) , with the involvement of 2 species i.e CabdX(alkyl halide) & Nu:-(Nucleophile), the reaction mechanism is said to be a SN2 Mechanism , conveying the following meaning S-Substitution, N -Nucleophilic & 2-Bimolecular.
There’s an OH- group attacking the carbon bonded to Br from 180º of Br. Then they’re through a transition phase where the bond formed gives energy for the breaking of the C-Br bond. Then OH bonds with C, Br- is kicked out. Residue is NaBr.
You get yourself 2-methylpropanol.
There’s an OH- group attacking the carbon bonded to Br from 180º of Br. Then they’re through a transition phase where the bond formed gives energy for the breaking of the C-Br bond. Then OH bonds with C, Br- is kicked out. Residue is NaBr.
You get yourself 2-methylpropanol.
More
VOTE
More
VOTE
MECHANISM OF NUCLEOPHILIC SUBSTITUTION REACTIONs.
This type of nucleophilic substitution follows second order kinetics, i. e, reaction rate depends upon the concentration of both reactants.
MECHANISM OF NUCLEOPHILIC SUBSTITUTION REACTIONs.
This type of nucleophilic substitution follows second order kinetics, i. e, reaction rate depends upon the concentration of both reactants.
VOTE
The most convenient way of doing so is to check the bulkiness of the carbon atom on which the reaction occurs i.e. the carbon atom on which the leaving group is attached.
If the carbon is less bulky i.e. attached to only one other carbon atom while the rest of the valency is fulfilled by hydrogen, then SN2 reaction is most likely to occur.
If the carbon atom is either bulky, or there is a possibility that the carbocation formed on that carbon atom will be stable enough, then SN1 is more likely to occur.
The prediction might sometimes depend on the medium of reaction as well, but only in rare cases.
The most convenient way of doing so is to check the bulkiness of the carbon atom on which the reaction occurs i.e. the carbon atom on which the leaving group is attached.
If the carbon is less bulky i.e. attached to only one other carbon atom while the rest of the valency is fulfilled by hydrogen, then SN2 reaction is most likely to occur.
If the carbon atom is either bulky, or there is a possibility that the carbocation formed on that carbon atom will be stable enough, then SN1 is more likely to occur.
The prediction might sometimes depend on the medium of reaction as well, but only in rare cases.
More
VOTE
First of all prepare 0.1 normal or molar NaOH solution by dissolving 4 gm NaOH in 1000 ml or 2 gm NaOH in 500 ml of distilled water. Now dissolve 2 gm of Na2CO3 in 100 ml 0.1 normal or molar NaOH solution prepared above.
First of all prepare 0.1 normal or molar NaOH solution by dissolving 4 gm NaOH in 1000 ml or 2 gm NaOH in 500 ml of distilled water. Now dissolve 2 gm of Na2CO3 in 100 ml 0.1 normal or molar NaOH solution prepared above.
More
VOTE
SN2 mechanism is a single-stage reaction. The reaction mechanism for the reaction between bromomethane and NaOH (actually OH⁻ ion) is shown below:
SN2 mechanism is a single-stage reaction. The reaction mechanism for the reaction between bromomethane and NaOH (actually OH⁻ ion) is shown below:
More
VOTE
In SN1 we see that intermediate of the reaction is the carbocation formation. The ease of carbocation favours the reaction. So, focus on the stability of carbocation.
Now, coming to your example, alongside of bromine there are 3 (+I)prevailing groups (2-CH3 & 1-CH2CH3 ). So the reaction favours to the carbocation formation. So, here SN1 takes priority over SN2.
In SN1 we see that intermediate of the reaction is the carbocation formation. The ease of carbocation favours the reaction. So, focus on the stability of carbocation.
Now, coming to your example, alongside of bromine there are 3 (+I)prevailing groups (2-CH3 & 1-CH2CH3 ). So the reaction favours to the carbocation formation. So, here SN1 takes priority over SN2.
More
VOTE
The SN2 mechanism is a one-step process in which a nucleophile attacks the substrate, and a leaving group, L, departs simultaneously. Because the reaction occurs in one step, it is concerted. The substrate and the nucleophile are both present in the transition state for this step.
The term SN2stands for Substitution reaction, Nucleophilic, 2nd order (also called bimolecular). According to the SN2 mechanism, there is a single transition state because bond-breaking and bond-making occur simultaneously. ...
Stronger nucleophiles are said to have increased nucleophilicity.
Mechanism SN2 reaction- The general form of the SN2 mechanism is as follows:
The SN2 mechanism is a one-step process in which a nucleophile attacks the substrate, and a leaving group, L, departs simultaneously. Because the reaction occurs in one step, it is concerted. The substrate and the nucleophile are both present in the transition state for this step.
The term SN2stands for Substitution reaction, Nucleophilic, 2nd order (also called bimolecular). According to the SN2 mechanism, there is a single transition state because bond-breaking and bond-making occur simultaneously. ...
Stronger nucleophiles are said to have increased nucleophilicity.
Mechanism SN2 reaction- The general form of the SN2 mechanism is as follows:
More
VOTE
SN2 reaction is called as Nucleophilic substitution reaction 2.
A nucleophile (electron excess specie, a negatively charged specie) attacks the substrate and displaces the leaving group .
This reaction is a single step reaction and involves a transition state but no intermediate formation .
Difference between a transition state and an intermediate- transition state is short lived and cannot exist in it's own while an intermediate is itself a whole species and it is stable enough to live for a longer time. Also in transition state the new bond formation and old bond breaking takes place simultaneously while an intermediate like carbocation is formed when the bond breaks.
SN2 reaction is a second order reaction which means the rate of reaction depends on both the concentration of substrate and the nucleophile (the attacking specie.)
Mechanism-
SN2 reaction is called as Nucleophilic substitution reaction 2.
A nucleophile (electron excess specie, a negatively charged specie) attacks the substrate and displaces the leaving group .
This reaction is a single step reaction and involves a transition state but no intermediate formation .
Difference between a transition state and an intermediate- transition state is short lived and cannot exist in it's own while an intermediate is itself a whole species and it is stable enough to live for a longer time. Also in transition state the new bond formation and old bond breaking takes place simultaneously while an intermediate like carbocation is formed when the bond breaks.
SN2 reaction is a second order reaction which means the rate of reaction depends on both the concentration of substrate and the nucleophile (the attacking specie.)
Mechanism-
More
VOTE
Hello friend
i) Nucleophilic substitution (SN) reactions :
As the carbon of alkyl halide (RX) is electrophilic or electron deficient , owing to polarity of C - X( Carbon -Halogen bond) , the electron deficient carbon is prone to be attacked by the Electron rich species called Nucleophiles.
(SN2) mechanism
Hello friend
i) Nucleophilic substitution (SN) reactions :
As the carbon of alkyl halide (RX) is electrophilic or electron deficient , owing to polarity of C - X( Carbon -Halogen bond) , the electron deficient carbon is prone to be attacked by the Electron rich species called Nucleophiles.
(SN2) mechanism
More
VOTE