3if u know the mechanism please post
CH3- CH2 -CH= CH2 + CH3-OH + (H+) -------> CH3-CH2 -CH(OCH3)-CH3
which is the electrophile in the first step ?
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12 Answers
1yup
srinath also told it is H+ only
actually this question came in some aits n i wrote H+ and they gave it
wrong :(
:P
3i thought that charged electrophiles r more reactive than that of the uncharged one
33But H+ will first attack lone pairs of oxygen naa??
so H+ can't be
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(and if it was so straight forward they will never have asked it :P)**
** this idea is for tests...and student should use it at their own risk... tukkabaji may be injurious to helath
1it must be H+ because as u suggested H+ going on attack on lone pair of oxygen then it that case corbonium ion will generate which is wrong because of two reasons
1-: H+ is more reactive
2-: product will get change
mechanism of rxn started with addition of H+ on π bond sys generating carbonium ion then attack of lone pair of oxygen on carbonium ion then removal of H+ therefore hydrogen is coming from the soln (point to remember in case of isotopic effect here it is secondary effect)
1i think carbonium ion would be attacked again by lone pairs od oxygen thereby removing H+!
so h+ is the answer
1mechanism :
1) H+ attacks double bond.
2) secondary C+ formed.
3) lone pair of O in CH3OH attacks the carbocation..
4) positive charge on O (so, unstable)
5) H+ leaves.
1but still a prob is there
if we r given the product then H+ is the obvious choice but still O is a much better electrophilic centre than the doubly bonded carban so y shudnt it attack CH3OH