New answers tagged stability
3
When polydentate ligands binds to a metal in a ring form, it is called chelate ring and the corresponding complex is called chelate complex.
Experimentally, it is observed that metal complexes of polydentate ligands with more rings are significantly more stable than the corresponding complexes of similar ligands but with less rings. Because, the larger the ...
5
The Hunsdiecker reaction is a halogenation-decarboxylation reaction of silver salts of carboxylic acids.
To understand what causes the yield to change, first we have to consider the mechanism of the reaction.
As seen from the mechanism the homolytic cleavage of the $\ce{O-X}$ bond is the slowest step in the reaction and thus is the rate determining step. ...
7
The relative stability of the two tautomers (two isomers differing how protons are bound) may be assessed from the equilibrium constant you may formulate for the two. Deriving from above illustration, it would be
to indicate that this is dynamic, with a back and forward reaction at microscopic level. Once formulated as such, you probably recall $\Delta{}...
1
In an allene system(two double bonds next to one another) the substituents on either carbon try to be in the plane perpendicular to each other. For reference see this image:
But as we know that a cyclobutane ring is completely planar, it will prevent this phenomenon and will produce a ring strain even more than that in cycloprop-2-en-one.
Now you might ...
0
let's see the resoance forms of benzyl carbocation and methoxy carbocation:
-Benzyl carbocation:
You are right, benzyl carbocation have multiple ressonance forms which means that It must be very stable. In fact, benzyl carbocation is one of the most stable carbocations.
-Methoxy carbocation:
In this case, we only observe 2 resonance forms.
so the question ...
1
Since electron-withdrawing groups (EWGs) lower orbital energy (we can rationalise this in terms of reduced electron density leading to reduced shielding), they will stabilise multiple bonds - you see this in the Diels-Alder reaction, where EWGs on the dienophile reduce the energy of its LUMO and so accelerate the reaction by reducing the gap between the ...
7
As far as I have read, in general, exocyclic double bonds (which are outside the ring) are stable for 3 or 4 numbered rings while endocyclic double bonds (which are inside the ring) are stable in 5 or 6 numbered rings.
As you note all the factors, more or less all factors are same in both cases, so it becomes a little handwavy thing.
Additional Reading:
...
1
My teacher says that while comparing the stability of the species concerned, we should remember that stability provided by Resonance>hyper conjugation>inductive effect. Of course there are exceptions(like in the case of chloro benzene where according to resonance the ring should be activated but inductive effect dominates it and the ring gets ...
Top 50 recent answers are included
