Organic Chemistry - FRiedel crafts rxn

1

voldy ·2009-03-20 22:01:24

ok comng up with 3D thing

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voldy ·2009-03-20 21:30:15

well octet completion

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skygirl ·2009-03-20 21:47:00

O has -I effect... it will mame the +ve charge more unstable..

thats y i told acylation is difficult.

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skygirl ·2009-03-20 21:47:27

pls rep.

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voldy ·2009-03-20 21:48:46

nah think a bit more sky

later it becomes obvious that acyl one is more stable .

your structure gives one clue I think . well no I'll post one with clue. ok ?

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voldy ·2009-03-20 21:49:57

see difference and try it .

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skygirl ·2009-03-20 21:54:14

am not getting any clue really...

donation of lone pair is possible only in case os alpha carbocation...

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voldy ·2009-03-20 21:55:57

ring any bells ???????

if not check this
see . the O atom donates electron pair . so the carbocation is not there O gets +charge . but octet of every atom is complete here hence more stable .hope you got it . there's a previous JEE Q on this assertion reasoning. Think ull find it in OPA

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skygirl ·2009-03-20 21:56:10

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skygirl ·2009-03-20 21:57:44

how can O form three bonds ?

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voldy ·2009-03-20 22:00:23

no sky !!!!!!!!!!!
[343]

the first thing you suggested is impossible not second one .

kahaan padhi tumne ??
please forget that thing it wrong this I'm sure. [341] cut it off from your head . totally wrong . bura mat maan na . par please don't think of such a thing

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skygirl ·2009-03-20 21:07:24

how ?

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skygirl ·2009-03-20 22:04:18

no nothing to mind...

thanx.... to correct me...

well power cut...

am sorry :'(

u post i will see wen it comes..

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voldy ·2009-03-20 22:18:45

kuch samgh me aaya ya aur bhi confuse ho gayi ??

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skygirl ·2009-03-20 22:24:42

no am back to square 1...

just got to know dat i am wrong ... but dunno why..........

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greatvishal swami ·2009-03-20 23:07:57

sri i cant get ur structure

how come O has 10 electrons

or i m missing something [7][7]

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karan9989 gupta ·2009-03-21 02:49:49

sky girlÂ Â Â u are 100% correct in your approachÂ Â C⁺=O is highly unstable

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voldy ·2009-03-22 05:34:37

sry vishal . there's one extra lone pair of electron.on O .
it should be this.
sry for mistake in figure.

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voldy ·2009-03-22 05:35:20

here octet of every atom is complete so it's the major contributng structure.

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voldy ·2009-03-22 05:35:34

I mean second structure.
woh 3-D wala me bhi confuse ho gaya isliye delete kardiya . sry ab jyada time nahi hai to baords ke baad post karta hoon . sry sky. :(