Questions tagged [reaction-mechanism]

The detailed (and as complete as possible) description of plausible or observable pathways leading from reactants to products of a chemical process. This tag should be applied to questions about these processes. It may be applied to hypothetical and/or proposed mechanisms.

Filter by
Sorted by
Tagged with
2
votes
1answer
48 views

Possibility of SET mechanism of Wurtz reaction

I was studying the Wurtz reaction, and I wanted to figure out the mechanism. When I searched the web, I came across the single electron transfer (SET) mechanism explanation. How can the alkyl group ...
1
vote
0answers
23 views

Reaction most dominant product for a low concentration nucleophile

If i got this reaction, and I determine that it will react in a Sn1 mechanism, will the dominant product will be in the results of the EtOH/H2O or CN-? I think, the main product will be with the CN- ...
2
votes
1answer
226 views

How to convert benzene to N,N-dimethylbenzamide?

This is my solution to convert benzene to N,N-dimethylbenzamide. If you think is the right way, even just saying the equations are correct would help me! Thanks in advance.
4
votes
0answers
59 views

Is there an adhesive that is not dissolved by acetone?

I am trying to glue glass sheets together to make a sealed 13" x 13" x 13" box. Inside this box there would be acetone gas used to melt 3D printed parts to make them more durable. Acetone will remove ...
2
votes
2answers
84 views

Why is hofmann product prefered here?

In the following reaction, Hofmann elimination is preferred. This reaction takes place by E1 mechanism. I thought the Zaitsev product would be major due to 1 extra hyperconjugating structure. In the ...
0
votes
1answer
78 views

How is carbon-halogen bond broken during Finkelstein reaction?

Finkelstein reaction is a halogen exchange reaction between haloalkane and a salt of a different halogenide: $$\ce{R−CH2−Cl + KI -> R−CH2−I + KCl}$$ From an answer of a previous question: As ...
3
votes
1answer
181 views

Order of reactivity of substrates towards Wurtz reaction

In a book I refer, it is said that: Both Ionic [carbanion] mechanism as well as free radical mechanism are widely accepted for Wurtz reaction. When I read this statement, I was thinking, which of ...
0
votes
0answers
33 views

Are SN1 reactions pseudo unimolecular first order reactions?

I believe the the Solvent (present in excess) helps in ionisation of R-X to carbocation in Rate Determining step so shouldn't the Rate Determining step be a pseudo-unimolecular reaction as 2 molecules ...
4
votes
2answers
340 views

What are the organic reactions that are taking place in this reaction?

I know that A is the product of a Knoevenagel condensation between the aldehyde and the diethyl malonate, due to the acidic protons of the latter, but I don't know what the reaction between that ...
1
vote
0answers
33 views

Synthesis of Schiff Bases in Aqueous Media

The paper https://www.hindawi.com/journals/jchem/2013/909217/ describes a possibility to synthesize salicylaldehyde-based Schiff Bases using water as a solvent. Yields shown for the microwave-assisted ...
3
votes
2answers
294 views

Reaction between Copper nitrate and ascorbic acid

I am confused on the products of reaction between copper nitrate and ascorbic acid. When I searched this online, one of the reactions I got was: $$\ce{2Cu(NO3)2 + C6H8O6 <=> 2CuO + 4H2O + CO2}$$ ...
2
votes
0answers
44 views

Seeing a case where both + and - mesomeric effect is shown

I came up with that -N=O group shows both +M and -M and I understand that. In my textbook it was written that " -N=O group attached to benzene shows both + m and -m depending on the nature of other ...
0
votes
1answer
28 views

Reverse of E1cB reaction

As we know that the first step of E1cB step is second of E1 and vice versa. So can we say that by reversing E1cB reaction we will get E1 reaction. In this the main problem which I am getting is in ...
0
votes
1answer
56 views

Formation of Acetal from Hemiacetal?

In the reaction mechanism of formation of Acetal from Hemiacetal, why doesn't H+ attack the Oxygen of OR Group instead of the OH? Since O in OR group has +I effect from two alkyl groups, shouldn't it ...
7
votes
1answer
126 views

Does the nitrogen atom move with in the molecule in an ammonia maser, or does the molecule flip?

This intriguing answer to Can reactions produce microwave or radio wave radiation? says (in part): An ammonia maser qualifies as an inorganic RF-emitting reaction. As the nitrogen changes position in ...
13
votes
1answer
566 views

Can reactions produce microwave or radio wave radiation?

I know that many reactions produce visible light, heat and sound, but is there a reaction (preferably one example for an inorganic and organic one) that could produce electromagnetic waves in the ...
2
votes
1answer
101 views

How does methyl vinyl ketone dimerise with heating?

(A) to (B) is simply reduction, tosylation followed by intramolecular reaction and removal of tosylate. However, I am not able to guess how dimerization will take place, seems similar to Rauhut–...
1
vote
0answers
34 views

Production rate of parallel reactions

The degradation of hydrogen peroxide in water $\ce{(2 H2O2 (aq) → 2 H2O +O2 (g))}$ can be catalyzed by $\ce{Br-}$ and $\ce{H3O+}$. Derive an expression for the production rate for the following ...
0
votes
1answer
37 views

Reason behind markovnikov's rule in hydration of alkenes via mercury catalysis

Recently I came across an interesting reaction regarding the hydration of alkynes using mercury catalysis (HgSO4) in the presence of sulphuric acid. I've read that after the mercury complex acts like ...
0
votes
0answers
25 views

Order of adding reactants on growth of Cu

I am reading the following paper which details the steps to control growth of Copper. They fabricate Copper powders from $\ce{CuNO3, NaOH, and C6H8O6}$. Specifically, in this paper they add the sodium ...
0
votes
0answers
30 views

Can you give me a mechanism for the following reaction? [duplicate]

Can you give me a mechanism for the following reaction? Here methyl is not shifting. Other ester group is shifting.
3
votes
2answers
173 views

Darzens reaction on allylic position

Question Attempt I thought the products would be from simple darzens reaction. So I replaced the OH by Cl. But the answer of mine seems way wrong. Do give some tips on what might be happening in ...
5
votes
1answer
121 views

Proposed mechanism for the catalyzed oxidation of CO by O3: Are NO and NO2 catalysts or intermediates?

The steps below represent a proposed mechanism for the catalyzed oxidation of $\ce{CO}$ by $\ce{O3}$: $$\begin{align} &\text{Step 1: } & \ce{NO2(g) + CO(g) &-> NO(g) + CO2(g)} \\ &...
0
votes
2answers
63 views

Reaction of metals with water [closed]

What does metals form when they react with water,for instance sometimes they form metal oxide but sometimes they form metal hydroxide.so how does this vary
0
votes
2answers
120 views

Major product of the reaction of m-hydroxyphenol in boiling aq NaHCO3

The reaction: (a) m-hydroxyphenol + aq. $\ce{NaHCO3}$/boil; (b) workup with $\ce{H3O+/H2O}$ I know that $\ce{CO2}$ will be formed by boiling aq. $\ce{NaHCO3}$, and so the reaction will be like Kolbe-...
0
votes
1answer
106 views

Calculating pH of reaction mixture of silver nitrate and ascorbic acid

I am designing an experiment but before I do, I wanted to understand if the following method is right to calculate the expected $\mathrm{pH}$ when I mix $\pu{0.736 M}$ $\ce{AgNO3}$ and $\ce{C6H8O6}$. ...
-1
votes
1answer
50 views

Double Replacement Reaction in which everything cancels out

We are currently trying to work out the double replacement solubility reaction for Nickel (III) Nitrate and Rubidium Sulfate. $$\ce{Ni(NO3)3 + Rb2SO4 -> Ni2(SO4)3 + RbNO3}$$ Balancing gives: $$\...
5
votes
2answers
158 views

Why does my metal phone ring stand becomes iridescent, and turns back to normal after a while?

I got this metal phone ring stand from online. When I was meddling with it, I notice the ring started to produce iridescence. (See photo-only the centre portion, the moveable ring is not affected) I ...
0
votes
0answers
28 views

Can the ion that isn't preferentially discharged discharge at the same time during electrolysis?

I would like to ask if the ion that isn't preferentially discharged can discharge at the same time during electrolysis. Also, is the ion discharged at a much smaller extent or just discharged right ...
1
vote
2answers
87 views

How is a reaction with more products than reactants spontaneous?

If I have a reaction that has $\Delta G^\circ = 0,$ where there are more products than reactants (for example, $\ce{A <=> 2B + 2C}),$ then if I change the concentration of all the reactants and ...
0
votes
0answers
38 views

Understanding chemical reactions

I just got in 10th grade and the first chapter in Chemistry in our school curriculum is Chemical Reactions and Equations The chapter is littered with a lot of chemical reactions and their equations ...
3
votes
1answer
100 views

Polycondensation of PMS

This is the reaction that I'm interested in. I reckon this is what occurs: But how does the reaction proceed from there, there is a lone pair on the oxygen in right side of my picture, but how do you ...
2
votes
0answers
26 views

Focusing on HOMO when discussing thermal electrocyclic reactions

When taking into consideration the outcome of a thermal electrocyclic reaction, why do we focus specifically on the HOMO of the conjugated polyene? Why does it seemingly have the highest contribution ...
0
votes
1answer
82 views

Does 1-phenyl-1-keto-but-2-ene show positive iodoform test?

It is told often that only compounds having a methyl ketone and corresponding alcohols show positive iodoform test. I tried to sketch a mechanism to show that 1-phenyl-1-keto-but-2-ene also gives ...
4
votes
1answer
46 views

What is the rate expression for decomposition of $\ce{H2O2}$ in the presence of a catalyst?

What is the rate expression for decomposition of $\ce{H2O2}$ in the presence of a catalyst? As far as I know for catalase, it is like this: $$\ce{Rate = k[H2O2][Catalase]}$$ I don't know what it is ...
1
vote
1answer
41 views

Does lower activation energy definitely mean higher rate?

Does lower activation energy definitely mean higher rate? For example the decomposition of $\ce{H2O2}$. Can we say it has the highest rate with the catalyst making the reaction's activation energy the ...
1
vote
1answer
71 views

How does the cyclisation of the 3,6-dimethylocta-2,6-dien-4-yne occur?

The given molecule is treated with $\ce{H+}$ and an acid, that is all. I know that the alkene part reacts with the $\ce{H+}$ first, but have no idea on how to proceed further. I don't see how a ...
8
votes
1answer
226 views

Effect of substituents on arene oxide-phenol rearrangement

When I was learning about the reactions of epoxides from my textbook, I came across the following mechanism for arene oxide-phenol rearrangement in the presence of acid: NIH Shift - National ...
1
vote
0answers
74 views

Mechanism of alkene dihydroxylation with potassium permanganate

I have scavenged the internet for different mechanisms for permanganate-mediated alkene oxidation and have found satisfactory mechanisms for oxidative cleavage and dihydroxylation under basic ...
1
vote
0answers
336 views

Reduction of nitrobenzene in alkaline medium

My teacher listed out the following set of reactions under the aforementioned topic: He explained the formation of azoxybenzene as follows. Reduction of nitrobenzene produces 2 intermediates: ...
1
vote
1answer
54 views

Biphenyl esterification [closed]

I was wondering that at optimum temperature can 6,6'-bis(hydroxymethyl)[1,1'-biphenyl]-2,2'-dicarboxylic acid show esterification reaction. I know that the two phenyl groups aren't in the same plane ...
0
votes
0answers
30 views

Can bond rotation take place in Pinacol-Pinacolon rearrangement

I was given a question of pinacol pinacolon rearrangement of butan-2,3-diol where the methyl groups were anti to the respective hydroxy groups. Can the C2-C3 bond be rotated to allow hydrogen to be ...
0
votes
1answer
27 views

Why is substitution of halogens to alkanes a chain reaction?

During the propagation step 2, the alkyl radical always react with the halogen molecule according to my textbook. However, isn't the alkyl radical react with the halogen radical formed in the ...
0
votes
0answers
32 views

How to add components in visual MINTEQ

I need to figure out speciation of a mixture of metal nitrates and chloroplatinic acid. I am using visual MINTEQ to do this. But platinum ion is not there in the visual MINTEQ component list. I need ...
1
vote
1answer
76 views

Does the reaction of 2‐hydroxy‐6‐methyl‐5‐nitrocyclohepta‐2,4,6‐trien‐1‐one with NaOH involve ring contraction?

What is the product and mechanism when 2‐hydroxy‐6‐methyl‐5‐nitrocyclohepta‐2,4,6‐trien‐1‐one is reacted with $\ce{NaOH}$? The only reagent used is $\ce{NaOH}$ so I suppose it abstracts the ...
0
votes
0answers
21 views

Mechanism of electron delocalisation from the other end of alicyclic chain

When one adds $\ce{Br2}$ and $\ce{CH2Cl2}$ to 5-Methylhex-5-enol, this mechanism follows; Also,in adding $\ce{Br2}$ to 2,2-Dimethylhexa-3,4-dienol, this follows; What is the mechanism here, in which ...
1
vote
1answer
46 views

Converting Chlorine Dioxide to Free Residual Chlorine

Our water treatment facility used Chlorine Dioxide to disinfect the produced drinking water. The analysis results indicate concentrations of 0.2 mg/l of chlorine dioxide at the source. Can we analys ...
1
vote
2answers
63 views

In free radical substitution of propane with halogens, how do you know which carbon ends up with an unpaired electron after fission of C-H bond? [duplicate]

In free radical substitution of propane with a halogen (eg- chlorine), how do you know which carbon out of the three ends up with an unpaired electron after fission of C-H bond? This image shows ...
9
votes
5answers
2k views

How to create black precipitate in clear liquid

I am not a chemistry person at all, so my apologies if my question seems dumb. I am working on the set for a short film and in one of the scenes we would like the main actor to look at a sample of ...
2
votes
0answers
55 views

Mechanism of Possible Acid Catalysed Ring Opening

Here's a problem I'm stuck with - The first step looks like the usual addition of hydroxylamine to the ketone, resulting in two diastereomeric oximes (this is probably what (A) is). Further, in the ...

1 2 3
4
5
47