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.

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Major Product and Mechanism of following reaction [closed]

I tried Sn1 and got a 3° Carbocation and placed my OH- there but in the solution they have formed a cummulated Diene with OH on the benzylic position giving an enol which tautomerize to Alpha-Beta ...
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Preference for most acidic hydrogen

I understand that deprotonation from the carbon circled in red is feasible because deprotonation results in a resonance-stabilised structure. But according to it, deprotonation is also feasible in ...
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What Does it mean by "Anion of a weak acid is a strong Base" [closed]

my textbook is currently talking about salt hydrolysis but am not undersyanding this statment given.
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why Tin/Zinc alloys can be used to solder aluminum and Tin alone does not "wet" the aluminum?

It is impossible to solder aluminum with only tin, tin does not "wet" aluminum surface because of the instantaneous reaction aluminum/oxygen on the surface of the base metal (aluminum). I ...
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What results from the reduction of Hordenin? How is it possible that it has the same chemical formula as Ephedrine (C10H15NO)? [closed]

How is it possible that Hordenin Hydrochloride CAS 539-15-1 has the formula C10H15NO as well as Ephedrine Hydrochloride CAS 299-42-3 ?? So what happens by reducing Hordenin by a reduction reaction (...
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Reactivity of potassium in water vs. in methanol [duplicate]

When potassium metal is added to water, it react violently, but when potassium react with methanol, it forms bubbles. Why is this happening? why is potassium more reactive in water than in methanol
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What would the mechanism be for intermediate B to Supinidine, and what would by product C be? [closed]

I have managed to do the mechanism for the first step, but have no clue how 4 equivalents of MeLi are used for the second step of the reaction.
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Why Na2CO3 is basic? Does CO2 is produced when mix with water? [closed]

Recently I learned first time about Types of salts. So when I was learning about a weak acid and strong base salt namely "sodium carbonate", $\ce{Na2CO3}$. So I search how it is basic salt. ...
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Does H2CO3 dissociate into 2H+ and CO3^2-? [closed]

Does H2CO3 get dissociated into 2H+ And CO3^2-? Than it should liberate high amount of H+ Ion and would be a good acid(strong)?
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Synthetic Autunite reaction with HCl

The mineral autunite, $\ce{Ca(UO2)2(PO4)2}$, is usually present in a hydrated form (i.e., $\ce{Ca(UO2)2(PO4)2 * {10}-{12} H2O}$). I'm interested in understanding the reaction with hydrochloric acid. I ...
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Are there any pathways that can change a solution to all colors of the rainbow?

The challenge's like this. Suppose you have a beaker containing a liquid of transparent or any color. You add some drops of another liquid and the beaker turns into, say, red after some swishing. You ...
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How do I measure concentration of CO2 evolved from a decomposition reaction of a metal carbonate?

Context: I have to design and perform an experiment in school where I have to decompose various metal carbonates and measure the rate of reaction. I realise one way to do it is to measure the ...
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Efficacy of Intramolecular Friedel-Crafts reaction on =o, c=o bonds of ring structures?

Updated Q: Inquiring to understand the efficacy of intramolecular Friedel-Craft like reaction on stability on the ring structures with =o, c=o bonds. Keen to know if ring structures are challenged ...
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Photochemical cycloaddition of ethene

I've got a question regarding the (2pi+2pi)-photocycloaddition of ethene to form cyclobutane. If I understood correctly, the reaction doesn't take place under normal conditions, even if we increase ...
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Rate of Decomposition of Sodium Thiosulphate

I want to calculate the activation energy of the decomposition of sodium thiosulphate, as a part of my school research project. I am aware that I must use the Arrhenius equation where the rate of ...
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1answer
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Finding the order of decreasing rate of solvolysis of the following molecules with aqueous ethanol [closed]

In this question, I need to find the order of decreasing rate of solvolysis of the above molecules with aqueous ethanol. I think this can be done by finding the species that can form the most stable ...
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Chain transfer in polystyrene synthesis

while I was studying the many side reactions of radical polymerization, I stumbled across this source which illustrates the chain transfer side reaction in polystyrene synthesis: Of course, there is ...
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Is there any stereospecific enzyme in PDB that catalyzes an anabolic reaction and has an entry showing both reactant ligands?

I am desperately searching for an anabolic enzymatic reaction, ideally with a metal ion involved in the reaction complex, and for which -- unlike in the case of the lactose synthase -- we have ...
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How do I obtain a 3D MOLFILE for the lactose synthase structure, especially the catalytic center?

So for example there is a paper by Ramakrishnan and Qasba which presents a model in a 3d stereo picture it has UDP-Gal, Glc, Mn++, a piece of the lactalbumin protein (?) and a piece of the lactose ...
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What are the major products formed by reaction of methylidene cyclopropane with HBr in CCl4 solvent?

I am confused between two products: bromomethyl cyclopropane Allyl bromide Reason for my confusion: We know CPM cation will be formed which is stabilized by dancing resonating structures why can't ...
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Does the Oxy or Alkoxy Claisen Rearrangement Exist?

@Waylander's cogent Comment to the query of @Random Guy inspired me to post a problem in synthesis to test a question I have pondered for some time. The activation energy (AE) for the Cope ...
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Sigma resonance vs ring expansion [duplicate]

I was solving some problems on carbocation rearrangement and I happen to come across a situation in which there's a carbocation on the methyl group attached to cyclopropane such that it can show ...
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Alcohol to Ketone by CrO3 in cyclohexane

I have encountered an exercise question on conformation of cyclohexane and there is a statement saying, 'converting alcohol to ketone by CrO3 is much faster when R-OH is in axial position'. I would ...
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Alpha particles and nitrogen triiodide

I've been reading Wikipedia's article on $\ce{NI_3}$ (which doesn't contain an $\ce{I_3^-}$ ion, so "nitrogen III iodide" would probably be a better name for it) and getting very confused. I'...
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SN1 mechanism on 3,5-dimethylbenzyl bromide [closed]

I wanted to see how to make the product on the right so my thought was to have an SN1 reaction to remove water and have the bromine ion attack making the product on the right hand side. Is this ...
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Mechanism for alcohol synthesis via terminal acetylene reaction with sodium amide followed with epoxide and protonation

If anyone can give me some guidance here, it'd be much appreciated. I know the NaNH2 would dissociate and the NH2- base would deprotonate the terminal acetylene. I'm assuming the resultant product ...
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What is the mechanism of paracetamol synthesis from N‐acetylsulfanilic acid? [closed]

C can be converted to D with NaOH and heating at 300 °C. What is the mechanism of the reaction?
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How could we synthesize tert-butyl-alcohol, starting with just methane as only carbon source?

would it be possible to synthesize tert-butyl-alcohol with methane as the only carbon source? I mean, I almost figured it out, so basically methane is radically substituted by bromine under UV, then ...
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Why doesn't the protonated propyne rearrange? [closed]

In the reaction of propyne with $\ce{HBr}$ this cation (prop-1-en-2-ylium) was mentioned by my teacher: $$\ce{H3C-\overset{+}{C}=CH2}$$ He told me that the carbocation will not rearrange as it will ...
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How can a catalyst be selective if it does not change the equilibrium constants?

\begin{align} \ce{CO(g) + 3H2(g) &->[Ni] CH4(g) + H2O(g)}\\ \ce{CO(g) + 2H2(g) &->[Cu/ZnO-Cr2O3] CH3OH(g) }\\ \ce{CO(g) + H2(g) &->[Cu] HCHO(g) } \end{align} As we see here, ...
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How displacement reaction actually taking place? [closed]

"When a zinc plate placed in copper sulphate solutionfor some time,after sometime we can see holes in plate , why?" So this was a question in my book , I don't want answer of this one. But I ...
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Reaction of 1-Bromo-1-phenylethene with two equivalents of LDA

I was confronted with the reaction of 1-bromo-1-phenylethene with two equivalents of LDA, then the product is hydrolyzed. As it is a bulky base, it will surely deprotonate and form the phenylacetylene,...
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How can we synthesize this cycloester, starting with methyl 4-phenylbutanoate?

I was wondering how to realize following synthesis: I am struggling with this one; for sure, this has something to do with the benzyl position which is particularly reactive, and something ...
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Electrophilic addition when both phenyl group and alkene is present [duplicate]

Actually my doubt is that why the answer is C? I proceeded through markonikov addition, Carbocation formed on 2nd Carbon from benzene ring, did a rearrangement as the carbocation gains stability due ...
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Synthesis of allylic ether, starting with phenalene

I stumbled across a retro-synthesis question, for which I don't know the exact answer; I prepared two synthesis ways, but I don't know if they could be realized in a lab. The question is the following:...
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Does nascent Oxygen/Hydrogen really exist or just or is it just electron from ionic equation? [duplicate]

Recently I was taught by my teacher that there is no such thing as nascent oxygen neither hydrogen. It just represents Electrons from ionic equations. Then he proceeds to give example of following ...
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Simmons-Smith reaction, example reaction

Does this reaction work in theory? It's based on the Simmons–Smith reaction but with ZnCCl$_4$ instead of ZnCH$_2$Cl$_2$.
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What is the reason behind the stereoselectivity of the conversion of vinyl silanes to alkenes?

I have included some snapshots from clayden organic chemistry: The photos show a discussion of the addition of an electrophile to the bottom of the vinyl silane. However, what if the electrophile ...
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What is the correct molecular, total ionic, and net ionic reaction equation of reaction between magnesium nitrate and sodium chromate? [closed]

From the question, I think that the reactants are $$\ce{Mg(NO3)2(aq) + Na2CrO4(aq)}$$ But the problem is, I am confused about the result of the reaction. Is it $$\ce{MgCrO4}$$ and/or $$\ce{NaNO3}$$? ...
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Grignard-type reaction of 3-bromocyclohexene, or rather recombination?

I have a question regarding a proposed Grignard-type reaction which involves the conversion of 3-bromocyclohexene to 1-(cyclohex-2-en-1-yl)propan-1-ol, in diethylether. As the bromine atom lies in ...
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Sn(II) compound stereoselectivity in aldol reactions

In "advanced organic chemistry: part B" fifth edition, page:130, the authors state that chiral proline-like additives to Sn(II) compounds can further increase stereoselectivity of aldol ...
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Mechanism of cyclisation with tin(IV) chloride

I have taken this photo from synarchive: https://synarchive.com/syn/325 I tried reading the research paper this synthesis was found in (Couladouros, E. A.; Vidali, V. P. Chem. Eur. J. 2004, 10 (15), ...
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Product of reaction between cyclohexene and bromine in methanol at 273 K

What product could we expect when we let cyclohexene react with an equivalent of bromine in methanol at 0 °C? Is it just the trans-addition of bromine (rac.) or also the SN1-susbtitution on a carbon ...
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What is the role of magnesium nitride in ammosamide B synthesis?

The following is a snapshot of the synthesis of ammosamide B from Synarchive: In the final step $\ce{Mg3N2}$ is used to convert esters to amides or amides to amines. What is the mechanism of this ...
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Reaction of 3-chloro-2,2-dimethylbutane with sodium ethanolate in EtOH, which mechanism?

When we let 3-chloro-2,2-dimethylbutane react with sodium ethanolate in EtOH, which reaction do we expect? SN2, E2, E1 or SN1? I would say it's an SN2 reaction because ethanolate is not that strong of ...
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nBuLi and tBuLi can take part in halogen metal exchange OR deprotonate. Is there any way to predict which it favours?

I have included a synarchive pathway: https://synarchive.com/syn/144 where BuLi favours deprotonation over halogen metal exchange
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Calculating the concentration of reactants and products in parallel reactions after a time t

A substance A reacts with a solvent B to form an intermediate product IP. The reaction is bimolecular. The conc. of the solvent is constant at $12$M. IP can then react to form the two products P$1$ ...
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Reaction Mechanism for a radical ring opening

I have a radical reaction which I got from an organic chemistry lecture and was drawing the possible mechanism for it. Fig 2. shows my thought process. The I is removed making a radical and ISnBu$_3$. ...
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Why ketoses undergoes dehydration more rapdily than aldoses?

I was reading about Seliwanoff's test and Wikipedia mentions the principle behind this test This test relies on the principle that, when heated, ketoses are more rapidly dehydrated than aldoses. ...
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Reed Reaction Alkyl free radical attack

During the Reed reaction the alkyl free radical attacks the sulphur atom in SO$_2$. But why doesn't it attack the oxygen atom?

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