All Questions
Tagged with reactivity reaction-mechanism
68
questions
3
votes
0
answers
510
views
Why are “diene” structures in the C-ring of anthocyanins singled out for their singlet-oxygen quenching ability?
Anthocyanins are a class of water-soluble vacuolar pigments. They are sensitive to pH, and can undergo a series of structural changes according to a pH-dependent equilibrium as illustrated in Figure 1....
- 71
4
votes
1
answer
503
views
How do I decide whether ring will expand in this reaction or not?
Attempt:
After forming the carbocation adjacent to the cyclopropyl ring I had two options,
$\ce{Cl-}$ then and there without any changes
Expand ring, form a new carbocation and add $\ce{Cl-}$ ...
- 5,501
4
votes
1
answer
881
views
Which is easier, the nitration of toluene or the nitration of mesitylene (1,3,5-trimethylbenzene)?
Does the toluene can undergo nitration easier than mesitylene (1,3,5-trimethylbenzene), due to the high repulsion that will occur between $\ce{NO2}$ and the two adjacent methyl groups (in mesitylene ...
- 43
0
votes
1
answer
118
views
What is the reason for more stable keto form to tautomerise to a less stable enol form?
In the mechanism of SeO2 I have seen that a more stable keto form first converts to a less stable enol form and then yields a diketone. I have seen many other reaction where the reactant converts to ...
- 183
2
votes
0
answers
204
views
Where will a H+ attack on 6-hydroxyhexan-2-one? [closed]
Where will a H+ attack on 6-hydroxyhexan-2-one? Protonation can take place either on the ketone or the alcohol. So where will it attack? In short, on which of the two oxygen atoms is electron density ...
- 193
8
votes
2
answers
459
views
Compare rate of hydrohalogenation between 1,2-diphenylethene and 1-phenylpropene
Consider the compounds, (I) - 1,2-diphenylethene and (II) - 1-phenylpropene. Compare their rate of hydrohalogenation (HX addition)
I feel that the answer should be (II) > (I), but to my surprise it's ...
- 3,862
4
votes
1
answer
308
views
What drives a molecule/atom towards stability? [duplicate]
I'm very familiar with the concept that chemical reactions occur because the reactants a state of stability via the reaction. It's a very satisfying and fulfilling statement. But my question has ...
- 495
5
votes
2
answers
6k
views
Reaction of amines with diethyl oxalate (Hofmann amine separation method)
Why does only one molecule of secondary amine react with diethyl oxalate and two molecules of primary amine react with diethyl oxalate?
I feel secondary amine also should have reacted similar to ...
- 2,209
4
votes
4
answers
3k
views
Order of Reactivity of Halogens in Electrophilic Addition
What is the order of reactivity of halogens in electrophilic addition reaction via formation of cyclohalonium intermediate?
(A) $\ce{F2}$> $\ce{Cl2}$> $\ce{Br2}$> $\ce{I2}$
(B) $\ce{I2}$> $...
- 3,862
12
votes
2
answers
11k
views
Role of methanol in NaBH4 reduction
In reduction of carbonyls (aldehyde and ketones) to alcohols using NaBH4/Methanol, alkoxides are formed with the Boron which usually gets protonated on addition of water/acid.
My question is what is ...
- 129
1
vote
1
answer
4k
views
How can I predict whether a reaction will occur? [duplicate]
I'd like to know how can I predict if two substances will react. I already know that there's a reaction if one of the products is a weak electrolyte or a precipitate but that leads me to the question: ...
- 11
2
votes
0
answers
240
views
Can activated charcoal retain adsorbtion properties even when submerged in liquids?
This is following a question on Skeptics Stackexchange, where apparently medical science claims that activated charcoal can adsorb poison when ingested.
One of the members posted a related question on ...
- 123
1
vote
0
answers
184
views
How do you know if SN1 orSN2 reaction occurs when it is not so obvious? [closed]
For instance, when you have a primary halide with a weak nucleophile, do you think that the reaction mechanism would be SN1 or SN2, neither or would it even be both, like sometime leaving group can ...
- 1,096
3
votes
2
answers
918
views
Alkenes v/s Alkynes in two different reactions
Alkynes are less reactive towards electrophylic addition than alkenes. However, in case of catalytic hydrogenation, alkynes are said to be more reactive. Why? Also, if I want to add H+ as an ...
- 1,629
4
votes
1
answer
2k
views
Comparing SN2 reaction rate for phenacyl chloride and methyl chloride
KI in acetone undergoes $\mathrm{S_N2}$ reaction with (1) and (2). Compare the rates of the reactions.
Like many kinds of these questions there are many factors involved. One is the steric effect, ...
- 330