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OCR F324- Reaction mechanism for cyclohexene and bromine watch

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    in the ocr official a2 textbook (pg14) here is the reaction mechanism for cyclohexene and bromine, just wanted to know if there was a typo in the book
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    i've circled the two delta plus signs, are they both delta plus, or should one be negative?
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    (Original post by printergirl)
    in the ocr official a2 textbook (pg14) here is the reaction mechanism for cyclohexene and bromine, just wanted to know if there was a typo in the book
    Name:  Untitled.jpg
Views: 4791
Size:  109.1 KB

    i've circled the two delta plus signs, are they both delta plus, or should one be negative?
    oh yes well spotted! that is a mistake it should be negative
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    (Original post by printergirl)
    in the ocr official a2 textbook (pg14) here is the reaction mechanism for cyclohexene and bromine, just wanted to know if there was a typo in the book
    Name:  Untitled.jpg
Views: 4791
Size:  109.1 KB

    i've circled the two delta plus signs, are they both delta plus, or should one be negative?
    yes the second Br should be delta neg
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    Is that the one with the Calcium fluorite thing on the front? That book has way too many errors in it for my liking..
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    Anyone got any predicitions for this paper?
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    Yes that is a typo. Well the whole mechanism is incorrect, but correct as far as A-level!!!
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    (Original post by Char-)
    Anyone got any predicitions for this paper?
    You must be calcium bicarbonate, because if you let me get you wet, then the reaction will be explosive.

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    (Original post by printergirl)
    You must be calcium bicarbonate, because if you let me get you wet, then the reaction will be explosive.

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    Awks.
    You're just making bad chemistry jokes because all the good ones Argon.
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    (Original post by Char-)
    Awks.
    You're just making bad chemistry jokes because all the good ones Argon.
    Do you have 11 protons cos your sodium fine

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    The mechanism is actually incorrect, and an A-Level oversimplification. The first Bromide attached would actually stabilise the adjacent electron deficient orbital, forming a bromonium bridge. The second bromide would then attack from the opposite side, breaking the bridge.


    Name:  bromine 2.jpg
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Size:  7.7 KB This is the ultra correct mechanism in case you're interested, ignore the thumbnails
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    (Original post by LeonVII)
    The mechanism is actually incorrect, and an A-Level oversimplification. The first Bromide attached would actually stabilise the adjacent electron deficient orbital, forming a bromonium bridge. The second bromide would then attack from the opposite side, breaking the bridge.
    Yep, but it is an A-level thread in fairness :p:

    That mechanism is also missing a few curly arrows :ninja:
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    (Original post by EierVonSatan)
    Yep, but it is an A-level thread in fairness :p:

    That mechanism is also missing a curly arrow :ninja:
    Yeah, I know, but I certainly would have been interested to see the real mechanism at A-Level, to compare etc.

    Yeah, I know, it was the best I could find in the time I had, I'll see if there's a better one!
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    (Original post by EierVonSatan)
    Yep, but it is an A-level thread in fairness :p:

    That mechanism is also missing a few curly arrows :ninja:

    (Original post by LeonVII)
    Yeah, I know, but I certainly would have been interested to see the real mechanism at A-Level, to compare etc.

    Yeah, I know, it was the best I could find in the time I had, I'll see if there's a better one!
    I spent ages trying to work out what arrow was missing before I realised you were talking about the attachment not the embedded image. Silly me.
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    (Original post by illusionz)
    I spent ages trying to work out what arrow was missing before I realised you were talking about the attachment not the embedded image. Silly me.
    Haha yeah sorry, I don't seem to be able to delete the thumbnails!
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    (Original post by LeonVII)
    Haha yeah sorry, I don't seem to be able to delete the thumbnails!
    Ha its funny. Here I am 3 days before finals start and I was wondering if I had really forgotten how bromination of an olefin works...
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    (Original post by illusionz)
    Ha its funny. Here I am 3 days before finals start and I was wondering if I had really forgotten how bromination of an olefin works...
    Oh, so I take it that that's the correct mechanism and it won't be further destroyed a couple of years down the line?
 
 
 
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