E-StoreReaction intermediates
22 Jul 2007 13:02:28 IST
Reaction intermediates
SN1 Reaction :
1)First order kinetics
2)Two or more steps with a reactive intermediate.
3)Sensitive to electronic effects.
4)side products possible due to rearrangement.
5)Competes with E1.
6)Substrate preferences 30>20>10>Me
7)Typically 30 halides are the best.
8)requies polar protic solvents.
9)Usually the solvent is the nucleuphile.
SN2 :
1)Second order kinetics.
2)single elementary steps , no reactive intermediate ; a
single transition state.
3)No rearrangement possible.
4)Competes with E2.
5)Substrate preferences : Me>10>20>30
6)Typically 10 halides are the best.
7)Much better in aprotic solvents (eg : DMF ).
8)Strong nucleuphile in high concentration favour it.
E1 :
1)Two step , cation intermediate.
2)Competes with SN1.
3)Favoured in 30 substrates.
4)favoured by polar protic solvents.
5)Base strength is irrelevant.
E2 :
1)Single step , no intermediate.
2)Competes with SN2.
3)Trans co-planar , Trans-diaxial.
4)Suspectible to steric effects.
5)Favoured in less polar solvent.
6)Favoured by strong and hindred bases.
7)Favoured by increased Temperature.
Hope all of you find it useful.
Cheers !!!!!!!!!!!!
Comments (6)
22 Jul 2007 14:17:32 IST
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arey its coolll
y do u say so...thanx fr posting it :) :)
y do u say so...thanx fr posting it :) :)
10 Feb 2008 21:31:31 IST
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this is what is called a hnd writen article.........
perfect..............
perfect..............
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