Questions tagged [reactivity]

Applied to a chemical species, the term expresses a kinetic property in reference to another species. The tag should be applied to questions seeking answers with respect to the reactivity (or unreactivity) of a certain chemical compound, species, molecular entity and/or functional groups. It must not be applied to questions about the stability of certain chemical species.

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9
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0answers
208 views

Aza-enolates: why no reaction at N

My understanding is that aza-enolates have an advantage over enamines in enolate-type alkylations because the reaction at N is less likely. As a result, unactivated electrophiles can be used (i.e. ...
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2answers
3k views

Role of methanol in NaBH4 reduction

In reduction of carbonyls (aldehyde and ketones) to alcohols using NaBH4/Methanol, alkoxides are formed with the Boron which usually gets protonated on addition of water/acid. My question is what is ...
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1answer
1k views

Bonding of Lithium and Argon

I saw a meme that was joking around about Lithium and Argon bonding (see pic below). It got me wondering: Can Lithium and Argon bond in any circumstance?
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1k views

SN1 reactivity order for chloromethyl methyl ether and trityl chloride

Compare the reactivity order towards SN1 reaction for: (2-chloropropan-2-yl)cyclopropane $\ce{CH3OCH2Cl}$ $\ce{Ph3CCl}$ Owing to the exceptional stability of cyclopropyl ethyl ...
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197 views

Solve this chemical or biological mystery

I hope this is the best place to pose this unique question. Please forgive me if it's not. I went into a closet to get a prescription medication that was filled about a year ago. The label on the ...
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70 views

Reactivity of carbon-centered radical

I've read this site for a long time but I had never asked a question, so this is my first time :). So, i'm currently working on a computational chemistry project on radical cyclization reactions and ...
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86 views

Advanced Quantum Chemistry Reference for Reactivity Phenomena

I'm currently in organic synthesis seeking to develop quantitative "physical" (that of a physicist), rather than "chemical", intuition for areas where traditional VSEPR/ MO models cannot fully ...
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1k views

How to compare the oxidizing power of perhalate ions

In my book the oxidizing power in descending order of the following is given as: $\ce{BrO4-} > \ce{IO4-} > \ce{ClO4-}$ My doubt is regarding their order of oxidizing tendency. I thought that ...
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84 views

Why doesn't 1-cyclopropylethyne give a positive reaction in the bromine-water unsaturation test?

1-cyclopropylethyne has a triple bond: Hence it seems like it should yield a positive unsaturation test with bromine water. But, my book states that the opposite is true. I guess this may be due to ...
3
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0answers
100 views

Why are “diene” structures in the C-ring of anthocyanins singled out for their singlet-oxygen quenching ability?

Anthocyanins are a class of water-soluble vacuolar pigments. They are sensitive to pH, and can undergo a series of structural changes according to a pH-dependent equilibrium as illustrated in Figure 1....
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616 views

Why is the silver nitrate chemical test more favorable than that of sodium iodide?

Two tests to determine the presence of alkyl chlorides are the silver nitrate in 1% ethanol and sodium iodide in 15% acetone tests. These two tests both produce a precipitate when added to chloride ...
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130 views

Constructing a reactivity series, magnesium more reactive than sodium?

I reacted about $0.25 \,\mathrm{g}$ of magnesium, sodium and lithium in $20 \,\mathrm{ml}$ of $2 \,\mathrm{M} \,\ce{HCl}$ at room temperature. This was all done in a $100 \,\mathrm{mL}$ beaker. I ...
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139 views

Could any constituent of normal human urine produce a false positive in a Kastle-Meyer test for presence of blood?

From my understanding, one forensic test for the presence of traces of blood at a crime scene is (or was) the Kastle-Meyer test. Doing some research, I understand that in the test, hemoglobin reacts ...
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84 views

Grignard reaction - exchange of groups

Why is this reaction successful: Why doesn't metal-halide exchange occur easily to get Ar-MgCl and R-Br?
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36 views

NaOH vs Polypropylene

This source lists polypropylene as suitable for use with NaOH. However, this paper seems to demonstrate that NaOH slowly degrades polypropylene (even at fairly moderate temperatures). Does anyone ...
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90 views

Why do the induction effects of fluorobenzene decrease electrophilic addition reactivity, conjugation effects increase selectivity?

Fluorobenzene shows signs of both the electron withdrawing and electron donating groups on benzene. Electrophilic substitution to the ring is less reactive because the fluorine is very electronegative ...
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0answers
828 views

Is benzyl chloride or allyl chloride more reactive?

What compound is more reactive, benzyl chloride [(chloromethyl)benzene] or allyl chloride (3-chloroprop-1-ene)? I know that both have a higher reactivity than alkyl and aryl chlorides.
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165 views

What is the most likely reaction between minocycline and tramadol in physiological conditions?

Minocyline (left) and Tramadol (right) are two commonly prescribed medications containing typical organic functional groups. What would an expert chemist surmise as the first or most-likely reaction ...
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382 views

Why are thioethers not better leaving groups than ethers?

Why are thioethers ($\ce{RSR}$) not better leaving groups than ethers ($\ce{ROR}$)? I learnt that better bases are poorer leaving groups. Here, clearly the poorer base is thioether, as the lone pair ...
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164 views

Can activated charcoal retain adsorbtion properties even when submerged in liquids?

This is following a question on Skeptics Stackexchange, where apparently medical science claims that activated charcoal can adsorb poison when ingested. One of the members posted a related question on ...
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0answers
2k views

Naphthalene v/s Anthracene reactivity

Both have similar resonance energy per ring, even Naphthalene has a little higher Resonance energy (127.5 KJ per mol per ring v/s 127 KJ per mol per ring ) Can we prove , why there is a small ...
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298 views

Ketal formation of ethyl acetoacetate

Why does the ketone carbonyl group react in preference to the ester carbonyl? Is it something to do with the resonance occurring into the ester carbonyl from the oxygen? but how does this make the ...
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227 views

Electrophilic substitution in phenyl alkyl ether

Phenylalkyl ethers undergo usual halogenation in the benzene ring, e.g., anisole undergoes bromination with bromine in ethanoic acid even in the absence of iron (III) bromide catalyst. Why do we use ...
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0answers
301 views

How to calculate minimum temperature of a reaction?

For burning ethanol (its reaction with oxygen), we need a minimum activation energy (a minimum temperature) to start the reaction. Is it possible to calculate what are the minimum temperatures ...
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0answers
245 views

Why are trifluoromethyl diazirines so stable?

Why are trifluoromethyl diazirines so stable? Trifluoromethyl diazirines stability is well documented, however I am yet to find an explanation of why... Can it be homoaromatic or even aromatic? 2 pie ...
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259 views

Primary amine versus phosphoramidate reactivity with succinate esters

I have posted two reactions below. The top reaction is well known and occurs readily and near quantitatively (e.g. in protein modification), while the bottom reaction to my knowledge does not exist in ...
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58 views

How to predict and measure excess values of reactivity ratios for copolymerization with three monomers?

I ask this question because I haven't found interesting literature on the subject and I would like to know if my way to think is good or pure bullshit. Also the question is quite long because I have ...
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0answers
145 views

Requirement of different reagents for bromination of different substituted benzene rings

Consider the bromination reactions of phenol and anisole. We know that the former can be brominated by aqueous bromine, while the latter requires the catalyst $\ce{FeBr3}$ instead. Our teacher said ...
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0answers
57 views

Do amides oxidize to double-bonds?

Do amides from primary or secondary amines ever oxidize to a double-bond on the nitrogen? For example, like from an $\mathrm{R \bbox[yellow]{\color{red}{-}}(NH)-(C=O)-R'}$ to an $\mathrm{ R \bbox[...
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160 views

Why is cyclopropylmethyl radical opening so fast?

Ring opening of the cyclopropylmethyl radical is reliable and fast, and so has been used as a radical trap and a radical clock. Could someone please explain what exactly makes this reaction so fast, ...
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0answers
98 views

Material for melting metal oxides

I am constructing an apparatus for high temperature, strong alkaline melts (metal melts), with extremely high oxygen rich environments. Here what I have so far. Iridium is a good candidate - is it ...
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266 views

Why are copper, iron and lead so common in everyday use?

Copper, iron and lead are commonly used around the world in construction, for pipes and in electrical wiring. Why are these used instead of zinc and magnesium?
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69 views

What does the following sentence mean - “Li is least reactive but the strongest reducing agent among all alkali metals”

Isn't it contrasting? Is reactivity only concerned with kinetics of reaction ? PS - I am a high school student, probably I might be missing small detail!
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85 views

Are there any Endothermic Pyrophoric Substances?

I've recently been reading about pyrophoric materials, specifically as they relate to rocketry, and this made me curious if there are any substances which are the complete opposite of pyrophoric. ...
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1answer
551 views

Calcium reactivity vs electronic configuration

Calcium is an alkaline earth metal, so it is reactive. But, it has two valence electrons. Don't those two electrons fill up the first energy level? Isn't an atom with a full energy level considered ...
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16 views

What exactly is an 'activated' alcohol? Benzylic vs. Allylic vs. Aliphatic

I'm currently writing a report about the oxidations of various alcohols using different catalytic systems. In all papers it is stated that benzylic and allylic alcohols are "activated", while ...
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35 views

How to increase the conversion for the reaction between 2-acetylpyridine and diamine?

I tried refluxing in toluene using activated molecular sieves to absorb any water produced (didn't use Dean-Stark trap as it's a very small scale reaction). This reaction isn't going by changing the ...
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0answers
26 views

Why is the bottom white in a lucas test?

Consider this positive result from the Lucas test (adding $\ce{ZnCl2/HCl}$ to a tertiary alcohol): My question is quite straightforward but I can't find the answer. What is in the top layer (thin and ...
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0answers
16 views

What is the Reactivity order of alkali metals towards hydrogen?

I had read that reactivity of alkali metals towards oxygen is increasing down the group.But the reactivity of the alkali metals decrease down the group towards hydrogen. The reason given in my book is ...
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17 views

What happened to the Klopman - Salem equation?

I am relatively new and interested in the field of theoretical chemistry. I just stumpled across the Klopman - Salem equation (https://en.wikipedia.org/wiki/Klopman-Salem_equation). In daily life, ...
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0answers
19 views

Why do counterions influence reactivity in compounds such as LAH and borohydride?

My Organic Chemistry text (Klein) provides a "simplified" mechanism for Lithium Aluminum Hydride reductions. He notes that certain elements of the mechanism, such as the "role played by the lithium ...
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28 views

Reaction between chlorine gas and oxygen at 600 degrees Centigrade

Chlorine gas will not normally react with oxygen gas directly at STP. However, would the two react at standard pressure and 600 degrees Centigrade?
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36 views

Will Chlorodifluoromethane (R22 refrigerant) react with calcium metal?

I am attempting to recycle or find a use for chlorodifluoromethane, however I do not want to risk venting it into the atmosphere or exposing myself to hydrofluoric acid. Ideally, I would like to ...
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43 views

Highly concentrated NaOH solution at high temperature vs borosilicate glassware and cellulose?

I've read here on stack-exchange that NaOH will react with glass through the following reaction: 4 NaOH + SiO2 ⤑ Na4SiO4 + 2 H2O I would like to briefly heat a highly concentrated NaOH solution to ...
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0answers
633 views

Will silicon dioxide react with hydrochloric acid?

I have the following equation, based on the reaction of $\ce{SiO2}$ with $\ce{HF}:$ $$\ce{SiO2 + HCl -> SiCl4 + 2 H2O}$$ I want to know if this reaction is indeed feasible, what conditions may be ...
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134 views

Why is the HOMO always lower in energy than the LUMO?

We say that increasing the energy of the $\ce {HOMO}$ of molecules increases their reactivity towards electrophiles while decreasing the energy of the $\ce {LUMO}$ increases their reactivity towards ...
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43 views

Is the water absorbed by sodium polyacrylate available to react?

I'm curious whether the water absorbed by sodium polyacrylate would react with alkali metals, or be trapped by the sodium polyacrylate.
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0answers
105 views

What's the chemical reaction involved when adding Caesium to water?

According to the Notting Hill and Ealing High School, the reaction of caesium $\ce{Cs}$ with water $\ce{H2O}$ gives the following equation, $$\ce{2Cs (s) + 2H2O (l) → 2CsOH (aq) + H2 (g)},$$ producing ...
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1answer
1k views

Order of Reactivity of Halogens in Electrophilic Addition

Hello there. Here's a problem that appeared on one of my tests. What is the order of reactivity of halogens in electrophilic addition reaction via formation of cyclohalonium intermediate? I tried ...
0
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1answer
782 views

Why is fluorine deactivating while OH is not?

Both have 2p-2p overlap and oxygen and fluorine have similar electronegativities but OH is strongly activating while fluorine is deactivating