Simun Mishra posted an Question
July 04, 2020 • 13:51 pm 30 points
  • IIT JAM
  • Chemistry (CY)

In case of hydroborationoxidation reaction trialkylborane is form and after oxidation 3roh form so why here 1roh is formed ??

1 Answer(s) Answer Now
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  • Simun mishra

    I have all these books for organic chemistry

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    this is the all books I have for organic chemistry

  • comment-profile-img>
    Priyanshu kumar

    see

    cropped4952583853040973961.jpg
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    but both the side have same no of C atom

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    not that part not simun longest chain ring...this is bicyclo na

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    mainly this is distinguish for diels alder reaction and when there is any substituent

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    I m toomuch confused

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    diels alder reaction in which chapter

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    pericyclic reaction

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    only focus on product simun

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    for hydroboration oxidation..read stereochemistry mainly for all reaction

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    I want to know all about this

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    read this chapter and if any doubt comes then ask??

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    diels alder reaction present in organic reaction mechanism ?

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    yess mainly this is pericyclic reaction...

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    ok

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    suggest me most important topics of steriochemistry

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    simun go through one reference book of stereochemistry...D nasipuri is better...and when you read all the name reaction or any addition reaction then always try to find what is stereochemistry of that reaction...bcoz in examination ques in option product is same but they can change only stereochemistry...

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    can u send me the link of the book

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    and pls help how can I start for jam 2022 I want to clear all the basics of the topics

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    I have study Goc ..but steriochemistry is little bit toff for me

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    I want to study clearly form basic to all the tricks of organic chemistry

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    so which which chapters should I read

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    which book you have for organic??

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    https://drive.google.com/file/d/17O7xWR5hS48uzPkzkaq1KUfiemIiiPEO/view?usp=drivesdk go through this link you get

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    first go through syllabus and read that part only which is there in syllabus for stereopart...

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    you have sufficient time so in addition to coaching notes read some reference book too....it helps you in clearing all your basics...for organic clayden and paula bruice read and solve examples

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    I'm have send the book names pls check it

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    can u send me link of these books which u named

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    what are u studying know ?

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    sn sanyal rearrangement book is good for reagent and name reaction part, rl madan is too good,op tandon for iit jee mains n advance it is good...for jam read clayden,paula bruice etc

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    it helps

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    which link u send are image not not available

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    yes file size is larger...wait i m here send you link

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    ok

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    https://drive.google.com/file/d/17eDg50ZmkzWlL9Vtn5aNllfBxO2iQsET/view?usp=drivesdk go through this link

  • comment-profile-img>
    Priyanshu kumar

    see this you understand

    cropped4119300173058901457.jpg
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    have you got through this image.?

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    see the endo is like cis and exo is like trans

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    so for norbornene exo attacks 99.5% favours

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    can u openly draw this and send me with explanation

  • Suman Kumar

    As 3 moles of BH3​ reacts completely with 1 mole of the alkene. Now for 1 moles of an alkene, we rrequire1/3 moles of BH3​.

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    so which image I have send the first one gives 3 products meains 3..ROH or 1 ROH

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    It is 3 Roh

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    Again I am saying we don't care

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    so in exams we have to write 3ROH

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    Of they ask to do so you have to do.

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    How many moles of BH3​ are needed to react completely with 2 moles 1 pentene in hydroboration-oxidation reaction? A . 2 moles B . 3 moles C . 2/3 moles D . 3/2 moles

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    Like this they will ask question

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    Please mark thankyou 🙏 if you got

  • comment-profile-img>
    Priyanshu kumar

    simun see this for norbornyl system which attacks favours...exo or endo

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    exo or endo means

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    this type of isomerism is for bridged compound endo for the isomer which is closest to longest bridge

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    but here both are same

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    how to know which is exo and which is endo

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    can u send me a video to clearify this

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    okk simun wait

  • comment-profile-img>
    Priyanshu kumar best-answer

    see this

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    I m asking that in each case of HBO 3 product means 3 ROH are formed or not

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    no for alliphatic rings if there is excess of alkene given 3 moles and too steric bulk is less for alliphatic part then aromatic part...emphasis only on product

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    I can't understand

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    see you have given only one mole of product in option only they can change stereochemistry...so don't be panic

  • comment-profile-img>
    Priyanshu kumar

    rather you can say when 1-methylcyclohexene undergoes hydroboration oxidation racemic mixture is formed but always syn addition favours and here main thing is that in these reaction Bh2 is positive part and H is negative part..and BH2 attached to less substituted carbon

  • comment-profile-img>
    Priyanshu kumar

    see imagine the bulkiness around Boron if three aromatic rings is present....so in oxidation step that is 2nd step formation of alcohol is too hindered

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