Ortho/Para and Meta

[UCSD1984]

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Just watched O3.5 of Chad's, but he didn't mention what "Ortho/Para" and "Meta" mean, position-wise. I haven't taken O.Chem in a couple years.

 

[Vsno123]

Just watched O3.5 of Chad's, but he didn't mention what "Ortho/Para" and "Meta" mean, position-wise. I haven't taken O.Chem in a couple years.

ortho is right next to the functional group present, para is on carbon 4 (directly opposite of the functional group), meta would be on C3 (not right next to the FG present but one over). I always think of the word "OMP". Say you have a Cl functional group on a benzene ring. Right next to the Cl is ortho, right next to ortho is meta, and right next to meta is para. hope that makes sense!

 

[UCSD1984]

ortho is right next to the functional group present, para is on carbon 4 (directly opposite of the functional group), meta would be on C3 (not right next to the FG present but one over). I always think of the word "OMP". Say you have a Cl functional group on a benzene ring. Right next to the Cl is ortho, right next to ortho is meta, and right next to meta is para. hope that makes sense!

Perfect, I won't be forgetting that anytime soon. Thanks for the easy description!

 

[TheDentist16]

Yup that's absolutely correct with ortho/meta/para. Make sure you know what is "ortho/para directing" and what is "meta directing". Chad went over it quite nicely 🙂.