Re: meta-para-ortho compounds
bowersmy@plu.edu
Fri, 26 Sep 1997 16:09:03 -0700 (PDT)
I will explain the para, meta, ortho directors as i understand them.
Deactivators are electron withdrawing groups. They tend to make the
arenium ion more positive. They are meta directors, because by adding the
subsituent in the meta directors they are putting the positive charge as
far from themselves as possible.
Electron donors tend to be para and ortho directors, because this puts the
positive charge closer to the electron donating group. By doing this the
group can add some negative charge to the ring, and better stabilize the
ion. I hope this helps,
Mychelle
On Thu, 25 Sep 1997 youngcf@plu.edu wrote:
>
> In substituted rings, like the one we worked with in lab, when a aromatic
> nucleophilic substitution happens, what factors determine if the
> necleophile is going to be para, meta, or ortho? If it is just the fact
> that each substituent is an activator or deactivator for para, meta, or
> ortho positions, how are we to know the relative strength of one over the
> other? And, do reactions prefer to lean toward one type and have the
> others as a byproduct?
>
>
> Hope my question is clear. n Thanks.
>
> TOJC----- Curtis F. Young
>
>