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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1answer
32 views

Role of hcl gas in organic reactions [on hold]

I encountered many questions in the competitive exam field of high school organic chemistry where we add some compounds and treat it in excess alcohol solutions in the presence of dry hcl gas, it is ...
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0answers
30 views

What are the science concepts/processes in the reaction between hydrochloric acid and calcium carbonate? [on hold]

Can someone please explain the science behind this equation, in detail: How and why is the water formed? How and why is the carbon dioxide formed? Is this an acid-base reaction? Is carbonic acid ...
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27 views

Hemiacetal formation mechanism

The question is asking which reagents can be used to carry out this reaction. I get the L (PCC) is used to turn the primary alcohol into an aldehyde. However, I believe that is not the only reagent ...
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1answer
33 views

Testing for manganese in water [on hold]

Is there a decent way to test for solvable manganese in water without purchasing a 150USD test kit? I have a fair chemistry set available (I use it to teach my kids chemistry), and would rather pay ...
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0answers
21 views

What will cure sodium silicate besides CO2? [on hold]

I would like to cure water glass or sodium silicate. I tried air drying, but the skin that forms seems to prevent the rest of the compound from curing.
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0answers
13 views

Removing potash from water using poly-aluminum chloride

I have been conducting an experiment for a school project, (removing metals from water)I added 50 grams of sulphate of potash to 2 litres of water, then allowed it to dissolve for a 24hrs. On two ...
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1answer
36 views

Is it possible to predict release of acid fumes in certain acid reactions? [closed]

Upon mixing both acids, the reaction between Formic Acid and Sulfuric Acid, besides producing Carbon Monoxide and Water, releases a certain amount of acid fumes. Does anyone know if the fumes, in ...
4
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1answer
20 views

Role of THF in oxymercuration of alkenes

I am trying to self learn solomon's organic chemistry book, but there is no explanation over why we should use THF in oxymercuration. After a quick search I found out that THF help stabilize in ...
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2answers
35 views

Acidic Cleavage of ether with a 2° alkyl group

I know that an ether with a 3° alkyl group and a 1° alkyl group is cleaved by Sn1 mechanism to give a tertiary alkyl halide and a 1° alcohol. And an ether with a two 1° alkyl groups is cleaved by Sn2 ...
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0answers
36 views

Reacting ZnSO4 with KCl

I'm considering the following reaction: $\ce{ZnSO4} + 2 \ce{KCl} \ce{->} \ce{ZnCl2} + \ce{K2SO4}$ The high solubility of $\ce{ZnCl2}$ would favour the $\ce{ZnSO4}$ & $\ce{KCl}$ direction of ...
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0answers
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Reaction of carbonyls with alcohol

Why dont ketones react with mono alcohols to give acetals unlike aldehyde? They are very similar and almost share all general reactions. However, there was no reaction of ketones with mono alcohol but ...
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0answers
34 views

What is the total mass of oxides formed in this chemical reaction? [closed]

Sodium chromate reacts in an aqueous environment with metallic iron to form the oxides of chromium(3) and iron(3): 2H2O + 2Na2CrO4 + 2Fe <-> Cr2O3 + Fe2O3 + 4NaOH How can I find the total mass of ...
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1answer
40 views

Does 1,3-butadiene in bromine/water do addition twice?

Considering 1,3-butadiene (below) added to bromine water (considering it as $\ce{Br2(aq)}$): I've seen online that the products are 1,2-dibromobutene and 1,4 but what I don't understand is why ...
3
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0answers
46 views

Parameters by which to distinguish SN1 from E1

I am new to organic chemistry and am struggling with the following very basic question: Given is the following reaction: $$\ce{(CH3)3CCl + NH3(aq) →}$$ I am supposed to analyse the end-product (the ...
7
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1answer
137 views

Gold Plating on Glass?

I am considering labware options to handle NaOH solutions at ~150°C. One appealing idea would be to coat my current glassware with gold. I've read different sources mentioning the possibility without ...
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0answers
57 views

Mechanism of decarboxylation of cyclohexane-1,2-dicarboxylic acid

According to AIITS exam answer key, it was given that the following compound decarboxylates on heating: Then, I read Why are beta-ketoacids better at decarboxylation than gamma or delta? which is ...
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2answers
51 views

Synthesis of potassium trioxalatocobaltate(III) trihydrate

I've synthesized the compound potassium trioxalatocobaltate(III) trihydrate and for it I have two reaction equations. One of them is: $$\ce{CoCO3 + 3K2C2O4.2H2O -> K2[Co(C2O4)3] + 2CO2}$$ and the ...
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2answers
40 views

Rate law for breakdown of ozone to oxygen

For the following problem: Example 3: Write the rate law for $\ce{2 O3 -> 3 O2}$ given that the f‌irst step is fast and reversible, and the second step is slow. $$ \begin{align} &\text{...
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0answers
21 views

Copper catalyzed amination of chlorobenzene

When chlorobenzene reacts with ammonia in presence of copper oxide under certain pressure, aniline is produced. I am interested to know the mechanism for this since I am not sure how to guess a ...
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0answers
18 views

Heat of neutralization [duplicate]

(1) Why heat of neutralization of weak acid by strong base is always less than -57 kJ/mol? (2) How does heat of neutralization depend on the strength of the acids and bases used?
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18 views

Oxime to amine mechanism [duplicate]

I'm basically searching a mechanism for turning oxime to amine.My book gives me the reagent, LiAlH4 , but no mechanism, I suppose the first attack will be on the oxime carbon, I don't know what to do ...
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1answer
44 views

Reductive amination in case of secondary amines

When an aldehyde or a ketone undergoes reductive amination when a primary amine is acting,the mechanism follows a pathway through hemiaminal and imine,what happens when a secondary amine is acting on ...
3
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0answers
18 views

How can I determine the electrode potential of ethanoic acid redox reaction?

I'm conducting a research paper on the effect of surface area ratio from anode to cathode and the electrode material on the rate of electrolysis of ethanoic acid by measuring the volume of carbon ...
0
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1answer
63 views

Is this reaction possible? [duplicate]

When mixing HCl with K2CO3, the reaction that is usually given is the following: K2CO3 + 2HCl → 2KCl + CO2 + H2O I am wondering, however, if I could produce KHCO3 from K2CO3, by using half as many ...
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0answers
33 views

Why is there only little difference between molecular dipole moments in CHX3 compounds (X = Cl, Br, I)?

Why is there only little difference between molecular dipole moments in $\ce{CHX3}$ compounds ($\ce{X}$ = $\ce{Cl}$, $\ce{Br}$, $\ce{I}$)? As we can see there is a huge difference in dipole moment of ...
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1answer
41 views

What is the major product obtained on acidification of substituted epoxide?

The problem Source : MS Couhan (problems in organic chemistry . Chapter: Alcohols , phenols and ethers). My Thoughts If I proceed along $\ce{path 1}$ , $\ce1a$ is formed . It is unstable due to ...
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0answers
17 views

What causes the duration of the amber periods of the Briggs-Rauscher reaction to first increase and then decrease as the reaction oscillates?

I was collecting experimental data on the Briggs Rauscher reaction and realized that the period of the amber oscillations initially decreased and then started to increase. While I understand the ...
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1answer
57 views

Is it possible to produce sodium bicarbonate from potassium bicarbonate?

I balanced the chemical reaction which is as follows: NaCl + KHCO3 = NaHCO3 + KCl I've also gathered solubility values which are the following: KHCO3 22.4 g/100 mL (20 °C) NaCl 35,9 g/100 mL (20°) ...
2
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2answers
111 views

Does energy come from fuel or oxygen? (surprise?)

Question: Is it oxygen or fuel that releases energy during burning? The answer from this article: Why Combustions Are Always Exothermic, Yielding About 418 kJ per Mole of O2 (Journal of Chemical ...
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0answers
23 views

What's the mechanism behind mineral oil loosening cyanoacrylate bonds?

Per industry literature I found that mineral oil is used to loosen out "super glue" and aid in removal from skin. I am exploring the chemistry of this loosening and I am intrigued. Please help me find ...
4
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2answers
207 views

How to make 1,1-diphenyl-1-butene from benzophenone and 1-bromopropane?

I would like to know the method of syntheses of making 1,1-diphenyl-1-butene $(\ce{C16H16})$ from benzophenone $(\ce{(C6H5)2CO},$ generally abbreviated $\ce{Ph2CO})$ and 1-bromopropane $(\ce{...
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2answers
50 views

I can't find reaction enthalpy ∆H for water formation reaction

$$\ce{1/2 O2(g) + H2(g) → H2O (l)}$$ The tabulated value is $\Delta H = \pu{−285.8 kJ/mol}$ I'm using the bond energies values for each molecule and for some reason, I am getting a different result, ...
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0answers
40 views

Product of Diels-Alder reaction + Consecutive Reaction with base and heat

there is a problem regarding a Diels-Alder reaction that I do not understand (see image). The Diels-Alder reaction of the diene and the dienophile should lead to the product A. I hope I did it ...
2
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0answers
35 views

How do fuel/oxidizer combustion mechanics change when the constituents are supercritical?

The problem to solve is this: I want to create a heat generator [or heat absorber] that functions at atmospheric pressure to the pressure at the bottom of the sea. It will be used to drive a Stirling ...
6
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3answers
181 views

Reaction mechanism of rearrangement

I am currently studying for my organic chemistry exam, but there is one problem I do not understand. Unfortunately, I do not have any solutions. See image for the problem. My first thought was the ...
0
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1answer
47 views

What is the major product of the reaction between 4-chlorobut-1-ene?

When acetic acid looses hydrogen, an acetate ion is formed which attacks 4-chlorobut-1-ene, forming methyl butenoate. How does the cyclic structure form? Does the lone pair of oxygen attack the butene ...
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0answers
29 views

Difference between base-promoted and base-catalysed

Why is halogenation of ketones in base described as being "base-promoted" and not "base-catalysed"? If the reaction is not "catalyzed" then how is the base used up?
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2answers
57 views

Reduction of ester in presence of ketone group

As there is no ring expansion I'm assuming that a carbocation should not form at ester carbon as it leads to ring expansion. But is there any an exception to it? Also the hint provided along with this ...
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1answer
73 views

What is the mechanism of this pyrylium synthesis?

In this preparation, http://www.orgsyn.org/Content/pdfs/procedures/CV5P1106.pdf, 2,4,6-trimethylpyrylium perchlorate is prepared from 4 molecules of acetic anhydride and 1 molecule of t-butanol. ...
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2answers
119 views

Potassium carbonate vs. Potassium hydroxide in Wood Ash

I'm trying to get more concrete information about the chemical process of creating soap from wood ash. What I’m confused about: Many soap-making materials say that you create potassium hydroxide ...
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1answer
30 views

How to make an aluminumoxide coating on an electrode?

The Questions is above. I am not a chemist but that is what I know: Aluminum has an Oxide Layer normally Aluminum-Oxide Layer can be broken down with NaOH Zink coatings are done by galvanic coating ...
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0answers
87 views

Which of the following statements is true if HI is formed in the following reaction?

Which of the following statements is true if HI is formed in the following reaction? $$\ce{H2(g) + I2(g) -> 2HI(g)}$$ a. There are no collisions between the reactants in the reaction. ...
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0answers
77 views

Polar Protic and Aprotic Solvents

I know $\mathrm{S_N2}$ is favored polar aprotic solvents, which means that they may have hydrogens on them somewhere, but they lack $\ce{O-H}$ or $\ce{N-H}$ bonds, and therefore cannot hydrogen bond ...
3
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2answers
529 views

Coupling of silyl imine and aldehyde

LDA is a strong base and probably deprotonates somewhere which I'm not sure about. It I would to make a guess it would probably be beta to the imine. This is following by nucleophilic attack of the ...
3
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0answers
41 views

Will 1-[2-(chloromethyl)phenyl]propan-2-one, follow a Williamson ether synthesis route or, a Diels-Alder reaction?

I was asked to find the product of potassium ethoxide reaction with 1-[2-(chloromethyl)phenyl]propan-2-one (1). I came up with two different paths, each leading to the same product. 1-[2-(...
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0answers
32 views

intuitive explanation of Wegscheider condition and its violation

The Wegscheider condition restricts the values that rate constants in a set of chemical reactions can take on. can someone please explain intuitively why the condition has to be true, and give a ...
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1answer
42 views

why lithium is less reactive than sodium? [duplicate]

Lithium lies above sodium in a group and is also smaller in size. According to periodic trend reactivity decreases from left to right in period and down the group.
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2answers
99 views

What is the mechanism of the reaction of ethyl prop-2-ynoate to ethyl (2Z)-2,3-dibromoprop-2-enoate?

It's really weird for the product is 99% Z-comformation? Please tell me why? This reaction can be found in scifinder.
4
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0answers
151 views

Mechanism of DPD (N,N-diethyl-p-phenylenediamine) reaction with free chlorine

NOTE: As I've been finding new informations about the question, I've been editing the question to keep it up to date. If some comment doesn't make sense just check the Edit History. DPD (N,N-diethyl-...
0
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1answer
34 views

Synthesis for turning synephrenine into N-methylphenethylamine

I am trying to devise a synthesis to change synephrine (4-[1-hydroxy-2-(methylamino)ethyl]phenol) into N-methylphenethylamine. I was figuring that I could remove the hydroxyl group attached to the ...