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[tRNA]

primary alkyl halide +NaN3? No solvent is given
is this SN2 or E2??

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[Lonely Sol]

primary alkyl halide +NaN3? No solvent is given
is this SN2 or E2??

SN2

Ex:
CH3CH2Br + NaN3 ---> Ch3Ch2N3 + NaBr

 

[llopop]

Sn2. The E2 occurs with a primary halide when the reaction is done in strong base.

 

[jdmsamurai]

SN2 likes meth > 1 > 2 > 3

E1, E2, SN1 likes 3 > 2 > 1 > meth

 

[BodybldgDoc]

agree with everyone else.

 

[jdmsamurai]

also sometimes looking at the solvent is a dead give away also.....
since E1 and SN1 likes protic polar solvent look for H-bonds in the solvent aka O-H, F-H, N-H

and SN2 and E2 likes aprotic polar solvent...so anything polar with no H bonds....

and you can basically distinguish and elimination reaction with that of a substiution reaction by either form an alkene vs a sub.

easy points!

 

[RussianCUB]

the attachment of this NaN3 which is Na+ N3- is called an Azide. Azides attach in place of halogens.

 

[RussianCUB]

I forgot to add something. It is certainly not an Elimination reaction because no double bond is formed, therefor it is a substitution reaction. The only thing you need to now determine is whether it attaches through a carbocation, if not, then it's an SN2 reaction 100%