Ortho vs. Para

[Shjfr]

So... Kaplan says ortho is the major product and para is the minor product...

My class notes says para is always the major product

Which is correct?

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[eilrahcmi]

doesn't it depend on the reaction?

 

[whateveryoulike]

So... Kaplan says ortho is the major product and para is the minor product...

My class notes says para is always the major product

Which is correct?

it generally depends on how sterically hindered the ortho position is. the para position is treated preferentially because of the lack of steric hindrance, but you have to remember that theres still 2 ortho spots and only 1 para. if the ortho is hindered by a bulky 1'C attachment then its most likely para, if the 1'C has something less hindering then its prob ortho. either way, kaplan is wrong in making an absolute statement, esp since (in my experience) it usually IS para as the major product)

 

[klutzy1987]

kaplan is wrong in making an absolute statement

Whats new go figure, Kaplans has another mistake.

P.S. Para is almost always favored when all other things are equal.

 

[vhlam]

give us the problem.

 

[whateveryoulike]

Whats new go figure, Kaplans has another mistake.

P.S. Para is almost always favored when all other things are equal.

yeah tell me about it. youd think with how much they charge people to take their course (a rip off if you ask me) theyd have their crap down pretty solid. apparently not 🙄

 

[BDC27]

What is the exact problem.... there a few things to take into account when deciding which one is the major product!!

 

[gentile1225]

if the director is something small like a methyl group, chances are the major product would be in the ortho position as opposed to para. however, if the director was a propyl group, then the major would be para because of steric hinderance. also, very strong activating groups such as nitro groups will almost always direct para. hope that helps.

 

[doc3232]

if the director is something small like a methyl group, chances are the major product would be in the ortho position as opposed to para. however, if the director was a propyl group, then the major would be para because of steric hinderance. also, very strong activating groups such as nitro groups will almost always direct para. hope that helps.

Yes, but the thing coming in must be small. If it is big then 100% para.
If like methyl and director is methyl then it can be ortho.