The detailed and 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, which seek information on elementary steps of these processes. It may be applied to hypothetical and/or proposed ...

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3
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2answers
96 views

Does halogenation by PBr3 lead to an inverted product?

$\hspace{4.5cm}$ I think it follows the $\mathrm{S_Ni}$ mechanism and would not lead to Walden inversion, but the answer says otherwise. (the problem didn't indicate the presence of pyridine in the ...
0
votes
1answer
12 views

Nucleophile in a reaction [on hold]

How can we determine that in a compound which atom is a nucleophile in a reaction . I know we see resonance , but I am little confused between electronegativity , formal charge , solvent and size . ...
0
votes
1answer
34 views

Preparation of alcohols from Monosubstituted cyclic ethers [on hold]

Can methyl oxirane(epoxide) (a mono substituted 3 membered cyclic ether) form alcohols by reacting it with Grignard reagent? If yes, can you please explain the reaction with mechanism? If no, why?
0
votes
1answer
21 views

Ring expansion and carbocation formation

If in a reaction the carbocation is formed outside the ring then why does the ring expansion does not happen as follows:
0
votes
1answer
19 views

Haloalkanes and E1, E2 reactions

In an E1 reaction, I understand that the base reacts with the hydrogen of the carbon which is next to the positive charged carbon of the cation (of an haloalkane), because this hydrogen is supposed to ...
-1
votes
0answers
13 views

Which compound has a higher rate of solvolysis in aqueous ethanol?

Among the following compounds I think D compound has more rate of solvolysis in 50% aqueous ethanol at 45 °C than compound C due to more resonance, but the compound C has more rate.
0
votes
0answers
23 views

Na2CO3 + FeBr3 + H2O: Why don't we get some NaHCO3?

$$\ce{3Na2CO3 + 2FeBr3 + 3H2O -> 6NaBr + 2Fe(OH)3 + 3CO2}$$ Why don't we get some $\ce{NaHCO3}$? There is water, and $\ce{NaCO3}$ hyrdolyses to $\ce{NaOH}$ and $\ce{NaHCO3}$ in water. Is it ...
0
votes
0answers
31 views

The mechanism of boric acid esterification

The starting material is dehydrated borax. We have a hypothetical situation when the concentration of H2SO4 is 100%, is it possible to obtain tetraboric acid via the reaction between borax and the ...
-4
votes
0answers
20 views

What is the reaction equation for the production of [Cu(gly)2(OH2)]? [on hold]

What is the reaction equation for the production of [Cu(gly)2(OH2)]? I did an experiment and we used the following procedure to make cis-$\ce{[Cu(gly)2(OH)2]}$; Prepare cis-$\ce{[Cu(gly)2(OH)2]}$ as ...
0
votes
0answers
10 views

Mechanism of thyroid hormone synthesis: iodation and free radical formation

In the synthesis of thyroid hormone, what part of the thyroid peroxidase hormone is specifically responsible for abstracting the free radicals from the aromatic side chains in the iodated tyrosine ...
-3
votes
0answers
18 views

Substitution reaction of alkyl halide [closed]

If the reaction is PhCHO + SF4 I tried to make the compound , but i think I am doing something wrong . What's the mistake ]1
3
votes
1answer
48 views

Alkyl halide reaction

In the following the reaction , According to me the product should be compound (A) due to substitution reaction. But the product formed is the compound (B) , what could be the mechanism for the ...
1
vote
0answers
76 views

Why do NaNO3 + Al + NaOH yield ammonia?

From Russian test problem 4301: $$\ce{3NaNO3 + 8Al + 5NaOH + 18H2O -> 8Na[Al(OH)4] + 3NH3(g)}$$ How does ammonia evolve here? Is it that we get hydrogen gas evolving in the reaction between Al ...
0
votes
0answers
23 views

Solvent in a reaction [closed]

As I have seen many reaction in which below the arrow mark a compound is written , then How can determine in any reaction which compound is acting as a solvent ? Any help is appreciated .
0
votes
2answers
50 views

Na2CO3 + FeBr3 + H2O: why do we get Fe(OH)3?

$$\ce{3Na2CO3 + 2FeBr3 + 3H2O -> 6NaBr + 2Fe(OH)3 + 3CO2}$$ Why $\ce{Fe(OH)3}$? Where do these $\ce{-OH}$ groups come from? This is from a series of reactions in a Russian sample exam question. ...
0
votes
0answers
18 views

Why does K2ZnO2 + H2SO4 yield K2SO4 + ZnSO4?

$\ce{K2ZnO2 + 2H2SO4->ZnSO4 + K2SO4 + 2H2O}$ How does the ZnO2 ion disassemble here? Does it perform as a basic oxide, since we know that a basic oxide + an acid --> a salt + H2O? I'm not sure, ...
2
votes
0answers
17 views

Simmons-Smith Cyclopropanation and Sterics

I know this is a Simmons-Smith reaction. Wikipedia tells me this: The Simmons–Smith reaction is generally subject to steric effects, and thus cyclopropanation usually takes place on the less ...
0
votes
1answer
28 views

Why does nitration of aromatic amines give meta directed nitro compounds?

Amines are activating groups and donate electrons to the resonance structure using the lone pair of electrons on Nitrogen. But when aromatic amines are nitrated, for example when benzyl amine is ...
0
votes
0answers
20 views

Stereochemistry and epoxide opening

An alkene is reacted with a peroxyacid. Am I correct in thinking that these two different products can be obtained? I know that Gilman reagents can open epoxides, and do so on the less-substituted ...
1
vote
0answers
18 views

Reaction of PPh3 with a ketone

I understand that in the first step, mono-alpha halogenation occurs. Where I am slightly lost is in the second and third steps. Am I correct in thinking that because I have a substrate with a ...
0
votes
2answers
55 views

Substitution of nitro benzene

In the following reaction why OEt does not get attached to meta of NO2 . As there would be -M of NO2 and -I of Cl. But why it get attached at para of NO2 1: I am thinking of compound as ...
1
vote
0answers
21 views

Gilman Reagent with vinyl chloride

What are the products formed when vinyl chloride reacts with dimethyl copper? I thought the product formed would be propene. But answer given is PolyVinylChloride. How does polymerization take place? ...
0
votes
1answer
31 views

What is the result of this elimination reaction?

$$\ce{(R)-2-Bromooctane + alcoholic~KOH -> E2~reaction}$$ My answer is that this reaction will have a minor and a major product. In relation to the regiochemistry, the major product is the one ...
1
vote
2answers
50 views

Formal charges can mislead when writing arrow-pushing mechanisms

We know opposing charges attract and like charges repel. By this logic then, in the two examples on the left, the curved arrows would be show the formation of an oxygen-oxygen bond. However, these ...
-1
votes
0answers
22 views

learn chemical reaction at atomic level? [duplicate]

I read chemical reaction Before . It was like mix A and B with condition X and D is born.That was just lot of memorization.I need to know, why condition C,why other condition wont work, what other ...
0
votes
1answer
43 views

How do primary alcohols react with dihydropyrans

Its related to aldehyde and ketone.Q.7 I think it might be formation of acetal or hemiacteal reaction but I am not sure about it. Can anyone also explain me the mechanism of this reaction. Thanks in ...
3
votes
1answer
51 views

Reaction mechanism for 7-hydroxy-4-methylcoumarin synthesis with an iodine catalyst

7-Hydroxy-4-methylcoumarin can be synthesized from ethyl acetoacetate and resorcinol with iodine as a catalyst. What is the mechanism for this? From what I understand it follows the Pechmann reaction ...
8
votes
1answer
638 views

Weird Wikipedia Section on Oxidizing Behavior of Nitric and Sulfuric Acids

It has been my understanding that when nitric, perchloric, or sulfuric acids act as oxidizing agents, they must exist as whole $\ce{HNO_3}$ or $\ce{HClO_4}$ or $\ce{H_2SO_4}$ molecules that are still ...
0
votes
2answers
54 views

Reactivity towards SN1 reaction

In the following compounds , we have to find order of compounds of their reactivity towards SN1 reaction. According to me , we should compare carbo cation stability which is formed as an ...
0
votes
0answers
45 views

Reaction between sulfur and sodium hydroxide

Sulfur reacts with sodium hydroxide in the following way: $\ce{3S + 6NaOH->2Na_2S + Na_2SO_3 + 3H_2O}$ It is a disproportionation reaction: sulfur's oxidation changes from zero to -2 in sodium ...
10
votes
1answer
178 views

Mechanism of a dephenylation reaction

I recently came across this reaction in my undergraduate labs. The experiment is taken from this article: J. Chem. Educ., 2008, 85, 413. The condensation of 2-methoxynaphthalene with cinnamoyl ...
-3
votes
0answers
27 views

Acetone to Bromoacetone mechanism

Just wondering if someone can check my mechanism to see if it is correct..as I am slightly doubting my mechanism. Any help would be greatly appreciated!
0
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0answers
11 views

Friedel craft alkylation of toluene [duplicate]

When toluene is reacted with CH3Cl , AlCl3 with heat . Then the product is m-xylene. But methyl group is o,p-director , so according to me o-xylene and p-xylene must be formed .
3
votes
1answer
54 views

Why is a rearrangement observed for the secondary alcohol but not the primary in these examples?

I am thinking that maybe only hydrogen shifts are possible and methyl shifts are not allowed in such situation? Is that the reasoning? but then again in the second example the bromide could shift to a ...
-4
votes
1answer
31 views

Why is a double bond not formed with oxygen when reacting this molecule with PCC?

In my textbook it says that when reacted with PCC, primary alcohols produce an aldehyde. Why is this example different? I do not see any double bonds.
1
vote
1answer
34 views

Predicting major product of a reaction with nitrous acid

$\hspace{4.5cm}$ For the above reaction I am asked to predict $\ce{X}$, the major product. Of the options given, I thought product (1) would be correct, seeing as how it has the most stable ...
2
votes
0answers
14 views

Are there any suitable catalysts for ferric oxide and aluminum reaction?

As an exercise, I am trying to figure out how to catalyze the reaction of ferric oxide and aluminum Fe2O3 + 2Al -> 2Fe + Al2O3 I've been trying to find a substance A such that the reaction could be ...
3
votes
1answer
59 views

Friedel Crafts acylation mechanism

Here is my proposed mechanism, something tells me that the intramolecular deprotonation happens after, and that this is not concerted. Is my mechanism correct?
1
vote
0answers
23 views

Making a glow in the dark substance glow only when heat is applied

I want to make a glow in the dark substance that glows only if it gets warm. How do I obtain this substance, or what chemicals to I need to mix to make it? It's going to go in a sealed glass jar ...
1
vote
0answers
28 views

What is the graphical formula when nitrobenzene is added to HCL and tin?

On the image i want to work out the structure of compound Q. I know that it is a reduction reaction. However why is it that the answer to this question is not C6H5NH2, but is actually (C6H5NH3)+Cl-
1
vote
1answer
32 views

Propene react with ICl

When propene react with ICl , it gives an inoptically active compound ,why. According to me there is chiral carbon so it should be optically active
0
votes
1answer
27 views

Will this series of reactions work to produce potassium phosphate?

I want to end up with a solution or anhydrous sample of potassium phosphate with which I can grow larger crystals. I want a challenge and something to do so I don't want to buy potassium phosphate, I ...
6
votes
0answers
55 views

How does spin flipping of triplet carbenes occur?

Below is presented a page from Clayden Organic Chemistry 2ed. How and why does the spin flipping during the collision with solvent molecules actually occur?
0
votes
0answers
22 views

Hydroxyl to water reactions in minerals

The articles on wikipaedia on hydroxyl usually talk only about hydroxyl bound in organic compounds. Now, there are several minerals that also have the hydroxyl group bound inside, a typical example ...
3
votes
0answers
50 views

Mechanism for the Cleavage of Diborane?

The cleavage of diborane was presented in a recent lecture, and it was said that the borane could be cleaved unsymmetrically if sterics allowed, or symmetrically if they did not, as shown in the image ...
4
votes
1answer
93 views

Which groups take priority when predicting the stereochemical outcome of addition to cyclohexenes?

I am trying to understand the stereochemistry of iodolactonisation of this cyclohexene. When the iodine reacts forming the iodonium ion, I can't work out if it would attack from the top or the bottom? ...
3
votes
1answer
57 views

Mechanism of Diels-Alder reaction

I have a question about the mechanism of the Diels-Alder reaction. Is this a two-electron or one-electron process as described by Fig (a) or (b) respectively or does not matter? How do we know that? ...
0
votes
0answers
18 views

Aqueous ammonia mechanism

Hello! I am struggling on how this mechanism would occur, I am aware that the bromine will be removed by for some reason I cannot figure out the NH3 attaches onto the ring, can anyone prove me with ...
2
votes
2answers
124 views

3-step process to make propyl ethanoate from propene

I was asked to make propyl ethanoate from propene in three steps. I have access to the reactions below. Nucleophilic substitution (Both SN1 and SN2) Electrophilic addition Hydrogenation Dehydration ...
3
votes
0answers
80 views

Value of mixing ratio and rate constant in Chapman mechanisn

In the Chapman mechanism (which tells about the activities of ozone in the stratosphere), there is a equation for the lifetime ($\tau_{\ce{O}}$) of an oxygen atom, $\ce{O}$ against conversion to ...