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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2answers
78 views

Why are Friedel Crafts reaction not possible for molecules less activated than benzene?

I know that Friedel Crafts alkylation reaction are not possible for aniline and phenol since they form complexes with Lewis Acids. But our teacher told us that Friedel Crafts reactions aren't possible ...
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1answer
125 views

Can ring inversion in Cis-Decalin allow the E2 reaction?

This is a tutorial question I need to do, I initially thought the question was testing whether students properly understand (1) chair conformations of decalin, and (2) that the leaving group and the ...
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70 views

Converting pure nylon salt to polymer?

During one of the methods of polymerization: Nylon 6,6 is prepared from polycondensation of hexamethylene diamine (HMD) and adipic acid. The repeat unit of the polymer is $\ce{–[NH(CH2)6 NHCO(...
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1answer
99 views

Why does cinnamaldehyde pass the ferric chloride test?

I was given some data to determine what the unknown compound was and figured out that it was cinnamaldehyde. After reviewing the classification test given to me by my professor, I was a bit confused ...
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extract cellulose from CMC using cuoxam reagent (schweizer's reagent)

Good day, I am new in the field of chemestry. My question is, if it is possible to reverse or extract (I am not very sure how to say it), cellulose from carboxymethyl cellulose (CMC) by the use of ...
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2answers
74 views

Boiling Soda Reaction - Does It work? [closed]

I've come across a series of reactions, where $$\ce{2NaHCO3 <=> Na2CO3 + H2O + CO2}$$ at temperatures above 50 degrees Celsius, and $$\ce{Na2CO3 + H2O <=> NaHCO3 + NaOH}$$ I Have 3 ...
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1answer
128 views

Reactivity of different alcohols with NaNH2 and CH3I

Identify the final product (B) in the following reaction: I'm not sure how $\ce{NaNH2}$ and $\ce{CH3I}$ will react with the different types of alcohol present here. According to my solution,ether was ...
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1answer
103 views

Periodate oxidation of sugars

When Methyl D-glucopyranoside is treated with $\ce{HIO4}$, what is the amount of $\ce{HIO4}$ (in moles) consumed per mole of the sugar? I have studied that $\ce{HIO4}$ oxidises only those vicinal ...
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Will phosphorous Ylide participate in carbene generation and insertion?

The following question was sent to me . The answer for this question was given to me as option b I attempted it as following , recognizing the first step as a ylide reaction with a carbonyl compound....
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59 views

Cyclopropane instability to addition reactions

In a question I saw comparing the reactivity (to addition reactions) of cyclopropane, cyclobutane and cyclopentane, it was said that cyclopropane was most prone to addition reactions. Ring strain ...
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Meaning of chemical energy [duplicate]

I am trying to understand the meaning of chemical energy. I saw in my book that chemical energy is stored in the bonds of chemical compounds and when the bonds are untied the chemical energy increases....
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1answer
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Rate towards SN Ar reaction

In my organic chem notes,the following order for rate/ease of SN Ar reaction is given The reason given is The -I effect which stabilizes the carbanion so produced in the reaction. Turns out,my ...
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63 views

Mechanism of reduction of alkyl halides into alkanes by sodium borohydride with ethanol as solvent

From what I have studied, primary halides do not undergo this reaction whereas secondary and tertiary halides get converted into alkanes via this reaction. Since primary haldies do not show this ...
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2answers
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Reaction in Zinc-Carbon-Ammonium Chloride battery

I made a dry cell battery from zinc (Zn), carbon (C) and ammonium chloride (NH4Cl) which produced a current of 0.4 amps and voltage of 1.1V. However when I could not find the redox reaction that was ...
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1answer
59 views

Disinfectant production [closed]

One of my friends says that he made a disinfectant. These are the materials: 83% methanol isopropyl alcohol propylene glycol and the others are: citral, geraniol, linalool, dlimonene, l alpha ...
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Is an epoxide opening more favorable than a chloride leaving in the same molecule?

In general, we've learned that alkoxide groups are awful leaving groups, unless we're talking about epoxide rings whose ring strain allow the alkoxide to act as a leaving group in a ring-opening ...
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1answer
74 views

Which mechanism should a reaction between the cyclopentylmethanol and the HBr should follow?

I just thought that the reaction should follow $\mathrm{S_{N}2}$ mechanism this is because the alkyl halide is primary but the book says that the reaction will follow $\mathrm{S_{N}1}$ mechanism ...
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1answer
77 views

Mechanism for synthesis of Meldrum's Acid

I have a little bit of problem trying to figure out the mechanism for the synthesis of Meldrum Acid. Meldrum acid is synthesis by a condensation reaction of acetone with malonic acid in acetic ...
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149 views

Trifluoroiodomethane in basic medium

$$\ce{CF_3I + NaOH(aq) -> Major Product}$$ The Major product, according to me, should be ditrifluoromethyl ether $\ce{CF3-O-CF3}$. The hydrogen on the $\ce{-OH}$ group is quite acidic and hence ...
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2answers
133 views

Endothermic reaction absorbs heat from environment

I read on my school book about chemistry the reaction: $$\ce{H2O + NH4Cl}$$ with $T(\ce{H2O}) = \pu{25 °C}.$ The temperature of the final solution is $\pu{20 °C}$. I know that it is an endothermic ...
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1answer
64 views

Mechanism for Nagata Alkylation

I am looking into the mechanism for the Nagata Alkylation; however, I cannot find anything more specific than the mechanism listed below. I am only refering to the formation of the first ...
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108 views

Condensation reaction between catechol and acetone

I was thinking of ways to synthesize 2,2-bis(dihydroxyphenyl) propane and I thought it could be made by a condensation reaction between dihydroxybenzene (catechol) and acetone in strongly acidic ...
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1answer
104 views

How are unstable transition states determined? [closed]

The Wikipedia article about the Grignard Reaction says that The addition of the Grignard reagent to the carbonyl typically proceeds through a six-membered ring transition state. This got me ...
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Curtin-Hammett principle to evaluate alkene insertion

Given an unsymmetrical alkene in a simple non-stereoselective catalytic hydrogenation reaction. If one would want to investigate the nuances in the catalytic cycle of a dihydride complex leading to ...
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1answer
139 views

Enantioselectivity of Noyori Asymmetric Hydrogenation

I'm unable to understand the enantioselectivity of Noyori's hydrogenation reaction, and would appreciate any help with the same: Here's a mechanism I found on Wikipedia: but, to my disappointment, ...
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1answer
56 views

What is the molecularity of a reaction if it has a fractional order as per rate equation? [closed]

The rate equation of any reaction is found by using its slowest step. My book says that molecularity of the slowest step of a reaction is equal to the order of the same reaction. However, there are ...
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46 views

What is the chemical equation for a Maillard reaction? [closed]

I'm a 10th-grader in my first year of chemistry. We have an assignment to make a brochure about a certain reaction, and I'm studying Maillard reactions. Does anyone know the chemical equation ...
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Ammonia Vapor Absorption Refrigerator

I am working on fabricating the icyball system. I am planning to charge it with the help of convex mirrors. Whether it is necessary to create a vaccum inside the refrigeration closed cylinders before ...
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2answers
39 views

How can I eliminate the harmful gas produced from the heating/manipulation of galvanized steel? [closed]

When welding on steel with a galvanized coating, hexavalent chromium is yielded from the chemical reaction. This gas is something that I would like to eliminate before I begin welding, possibly with ...
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1answer
82 views

What is the “mechanism” of the decomposition of hydrogen peroxide?

In my classwork on the decomposition reaction of hydrogen peroxide by catalase, I wrote the following equation: $$\ce{2H2O2 -> 2H2O + O2}$$ However, my teacher said that I should go further in ...
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1answer
79 views

Reaction of octahydroazecine with iodine crystals [closed]

I really don’t understand why the following reaction would take place first of all. So this is a sub part of a question wherein we have to compare the basicity of the compounds formed through some ...
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1answer
114 views

Reaction of dimethyl sulfate with Protocatechualdehyde [closed]

I know that $\ce{(CH3)2SO4}$ reacts with phenols to give methoxybenzene. But the question that came in INChO-2018 was: When one equivalent of $\ce{NaOH}$ and one equivalent of dimethyl sulfate ...
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84 views

Mechanism of Etard reaction [duplicate]

According to Wikipedia Etard reaction proceed via a ene reaction with chromyl chloride forming a Etard complex(Chromium complex) which is then decomposed by a [2,3] sigmatropic shift to give aldehyde. ...
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1answer
51 views

How does Gypsum Concrete work?

When mixed with water how does gypsum act as a binder in creating concrete?
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1answer
98 views

What happens to concrete if you add lye to the mix?

What happens if you’re mixing concrete and you add some lye to it? Does it make it weaker, stronger or does nothing at all? I’m guessing concrete is basic so adding lye to it might expedite the ...
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2answers
106 views

Why organic reaction mechanisms so popular [closed]

Why are organic reaction mechanisms so much more popular than inorganic mechanisms? When I come to think of it, what is a reaction mechanism? How can we use an arrow? Is it a rough approximation of ...
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1answer
86 views

How to precipitate Chloroplatinic acid? [closed]

For the precipitation reaction, I have to react $\ce{H2PtCl6}$ with $\ce{(NH4)2CO3}$ while maintaining the $\ce{pH}$ in the range of 7-8 at 60 °C. But the problem is Chloroplatinic acid is not ...
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1answer
162 views

Reaction of alc. KOH with alkyl halide

The following question was given in FIITJEE study material: At first, I thought it should be elimination. But, soon I realized that there is no heating, plus a primary alkyl halide is used. So, "...
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1answer
299 views

Why does methyl not shift in the mechanism of isoborneol to camphene?

After the formation of carbocation, I was confused why would the reaction not go in favor of forming bornylene. I am still not sure why but I think that $\mathrm{sp^2}$ hybridized carbon will cause a ...
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44 views

Is the activation energy always inversely proportional to the reaction rate?

When I obtained the activation energy using the Arrhenius equation for a 10-minute glowstick (rapid, rigorous reaction), it was almost 4 times that of a 12-hour glowstick (slow, mild reaction). ...
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1answer
57 views

Se+P White or red P?

I read this in an old chemistry book. It says: When selenium is dropped into melted phosphorus, it dissolves rapidly, and the compound sinks through the liquid phosphorus in red streaks. My ...
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1answer
61 views

Double dehydration of a geminal diol [closed]

I've recently came across this reaction and I am wondering about the mechanism. Could someone please help me? If you could give me the name of the reaction (if it has one) it should also be enough for ...
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102 views

Ozonolysis: mechanism for reductive workup of ozonide using Zn/Acetic Acid/Water

What is the mechanism for the reductive workup of an ozonide using zinc/acetic acid/water? Many sources online show the mechanism using DMS instead: https://www.khanacademy.org/science/organic-...
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58 views

Substituted Diene Preparation from Aniline / Novel Cyclic Imine Preparation

I have recently been studying the following mechanism recommended by another user from the following DOI: https://doi.org/10.1016/j.tet.2004.06.026. In this paper, the following mechanism is proposed (...
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1answer
48 views

Calculate the mass of iron in the original mixture!

I seemingly can't solve the following problem, I've spend over 30 mins on it, no progress, can any of you geniusses give a step by step solution to me? Thank you so much Problem: A mixture of ...
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256 views

How long does it take Freon refrigerant to disappear from a room after an accidental major leakage?

I would like to know please how long does it take Freon refrigerant to completely disappear from a room after an accidental major leakage? Does it stick to surfaces , clothes or walls? Does natural ...
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54 views

Plausible Mechanisms for Polyketide Formation from Phloroglucinol

I am working on modifying the reaction below. I am adding the sulfonate (ignore the sulfonic acid groups shown) groups so that polysubstitution of the phloroglucinol does not occur. In terms of the ...
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1answer
78 views

Emulsification and liquid liquid surface reaction [closed]

What will happen if I skip the addition of surfactant? will the reaction happen only at the surface of the parent liquids?
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1k views

How is NaBH4 able to reduce tertiary alkyl halides to alkane but LiAlH4 create an alkene?

When attacking tertiary alkyl halides, aren't both of them just supposed to follow SN2 and substitute the leaving group with Hydride ion? Apparently only NaBH4 does it and LiAlH4 causes an E1 ...

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