Questions tagged [reagents]

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Oxidation of 1,2 dicarbonyls by tollens reagent

According to the wiki page on Tollen's reagent https://en.wikipedia.org/wiki/Tollens%27_reagent#Qualitative_organic_analysis It also gives a positive test with hydrazines, hydrazones, α-hydroxy ...
mark's user avatar
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Difference in reactivity of sodium ethoxide and NaOH in ethanol

What is the difference in the reaction that proceeds when we use the reagent $\ce{C2H5O- Na+}$ and $\ce{NaOH}$ in $\ce{C2H5OH}$ in with, say ethyl chloride. Is the latter considered to be "...
mark's user avatar
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Regarding Hinsberg reagent, potassium salt of primary amine soluble in base become insoluble after acidification?

Distinguish between ethylamine, diethylamine and triethylamine by using Hinsberg's reagent? Ans. This reaction is useful for the distinction of primary, secondary and tertiary amines. (i) Primary ...
JUA's user avatar
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66 views

Find the missing chemical structures in the reaction sequence

I came across the following question, where a set of reagents are used, starting from a carbohydrate derivative. I understand that this is some total synthesis reaction, but I cannot find which one. ...
Cyclopropanol's user avatar
1 vote
0 answers
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Recovery of antimony trichloride

I have bought 250 g of old antimony trichloride bottle (very cheap), it was never opened because it is sealed from manufacturer. But it was probably not stored well, or seal is not good, because there ...
Tom's user avatar
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2 answers
343 views

Can Acyl halides react with PCl5, if not, why?

I was searching for reaction of $\ce{PCl5}$ with carboxylic acids and found this mechanism: Here a corresponding acyl chloride is formed from a carboxylic acid. Now I doubt if this is the final ...
D13G's user avatar
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0 answers
26 views

Advice on Evaporation / Leakage of Marquis and Ehrlich's reagents

I had ordered both Marquis and Ehrlich's reagents from a manufacturer and they came in eye dropper like bottles inside of prescription pill like bottles. The perscription pill bottles also had cotton ...
Wizened Wizard's user avatar
1 vote
0 answers
112 views

Blue Tinge for White Paint [closed]

I am trying to make an aqueous white paint with Mica and TiO2 as mainstay that gives a slight tinge of blue when it dries but should remain white while in solution. So far I have tried optical ...
Amorphous's user avatar
3 votes
2 answers
2k views

Action of EtONa/EtOH on compound containing -CN group

In the above question, I know compound A will be prepared by just replacing -Cl with -CN group in the starting compound. I wanted to know what work would be C$_2$H$_5$ONa/EtOH doing in order to make ...
R_Squared's user avatar
  • 548
3 votes
1 answer
1k views

Why do we have to use anhydrous AlCl3 in Gatterman-Koch Reaction?

In reference to a Gattermann-Koch reaction, such as the one shown below: Why does $\ce{AlCl_3}$ have to be anhydrous? Why can't we just use normal $\ce{AlCl_3(H2O)_6}$? What would the reaction look ...
HarshDarji's user avatar
3 votes
1 answer
2k views

Reduction of conjugated ketone with lithium aluminium hydride

I came across a question about reduction of a conjugated ketone with $\ce{LiAlH4}$. Although it seemed quite easy at first sight, everything became cloudy as I dug deeper. My doubts regarding the ...
Cyclopropanol's user avatar
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3k views

How can I store reagent under inert gas?

I need to store some aliquots of 2,3,5-tribromothiophene. I searched for how to store reagent under inert gas, And I found this : https://avantilipids.com/tech-support/faqs/protect-from-oxidation In ...
Krang Lee's user avatar
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3 votes
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121 views

What is the difference between lead tetraacetate and sodium periodate as reagents?

I recently came across this question which has confused me about the usage of $\ce{Pb(OAc)4}$ and $\ce{NaIO4}$ reagent. Both the reagents have nearly the same cyclization mechanism, but the answer to ...
S.M.'s user avatar
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2 answers
635 views

Major product in reaction of butan-2-one + selenium dioxide

When reading about $\ce{SeO_2}$ I read this following reaction: $\ce{CH3CH2COCH3 ->[SeO2] CH3CH2COCHO + CH3COCOCH3}$ In the following reaction it was stated that $\ce{CH3CH2COCHO}$ was the major ...
Ashish's user avatar
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1 answer
473 views

Reagent notation: meaning of dash(-) and line(|) or slash(\) in reagents

I've seen a lot of reagents which have a slash between two compounds, such as Lindlar's catalyst which is $\ce{H2}$ along with $\ce{Pd|BaSO4}$. I know that the sulphur is a poison here but in general, ...
sam's user avatar
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1 answer
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Dihaloalkane reaction with sodamide/ammonia [closed]

In the following sequence of reactions: $$\ce{CH3-CH2-CH2-I ->[\text{Alc.}~KOH] \textbf{A} ->[Br2] \textbf{B} ->[NaNH2/NH3] \textbf{C}}$$ the product C is: alkene alkanol alkyne alkylamine ...
Siddharth Bisht's user avatar
1 vote
1 answer
183 views

How can one determine if all reagents will react in the reaction? [closed]

Is it correct that all the reagents above the arrow will participate to form an intermediate product, to which the reagents below the arrow are then added, and they react to form the final product? ...
user100934's user avatar
9 votes
1 answer
686 views

Why isn't sodium hydrogen phthalate used instead of KHP?

Why is potassium hydrogen phthalate (KHP) ubiquitously synthesized and used as a primary standard, while sodium hydrogen phthalate isn't even available to buy?
1__'s user avatar
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5 votes
1 answer
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TKN: Why are they called Missouri tablets?

When analyzing for Total Kjeldahl Nitrogen (TKN), you can make a copper sulfate digestion solution in the lab or purchase a variety of pre-prepared digesting tablets for example on VWR. My question is,...
SLR's user avatar
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1 answer
893 views

Reaction of 1,2-diketones with periodic acid [closed]

$\ce{HIO4}$ can oxidise alcohols. But does $\ce{HIO4}$ undergo any reaction/act as oxidant with 1,2-diketones?
Akshit Sharma's user avatar
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0 answers
48 views

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 ...
Rigel Antonio Olvera Bernal's user avatar
-2 votes
1 answer
475 views

Why don't we use silver hydroxide instead of Tollen's reagent for test of aldehydes? [closed]

AgNO3+NH4OH=AgOH+NH4NO3 AgOH is used for the reaction with aldehyde. But why can't we use silver hydroxide directly?
Rajarshi Misra's user avatar
3 votes
1 answer
524 views

Labware to handle hot aqueous NaOH

This question regarding appropriate handling of hot concentrated aqueous $\ce{NaOH}$ - with particular concern for avoiding dissolution of borosilicate glassware and contamination of the $\ce{NaOH}$ ...
Buck Thorn's user avatar
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9 votes
1 answer
1k views

Can I make a mirror on PET plastic using Tollen's reaction?

I want to make a very shiny surface, like a mirror. I tried to use chrome paint but it's barely shiny. It's more like gray even though I bought one of the most expensive chrome looking paint. I know ...
AIon's user avatar
  • 207
-2 votes
1 answer
824 views

1000 mg/L alkalinity as CaCO3 standard preparation [closed]

How do I prepare a 1000 mg/L alkalinity as CaCO3 standard? I found a method that says to dissolve 1.06 g of sodium carbonate (Na2CO3) in 1L of water but I'm not sure why I can't use 1g instead? ...
SBright's user avatar
1 vote
2 answers
2k views

How tartaric acid gives Tollen's test?

I wanted to know how Tollen's test is given by tartaric acid. Google searches say that it belongs to some "Hydroxyl" group. I know that it oxidises aliphatic and aromatic aldehydes along with α-...
Sarthak Rout's user avatar
0 votes
0 answers
195 views

Should I use MCPBA here?

I came across a question that asked for a method to convert propene to glycerol. I used the method in the pic, but I'm worried about two steps- Step-2, This reaction is just made up by myself! I'm ...
Shivansh J's user avatar
2 votes
0 answers
1k views

Detecting alkaloids - Dragendorff's reagent

I am writing a book and as part of the plot one of the characters has a plant that contains alkaloids in tincture form. They want to do a test to detect for the alkaloids so they use the Dragendorff's ...
Cari's user avatar
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0 votes
2 answers
252 views

Wetting agent for H2O2 solution

I need to increase the wetting of an $\ce{H2O2}$ solution on ceramic surfaces. Does anyone know of a common chemical I can use for this? The properties it would ideally have are: Increases wetting ...
user183966's user avatar
5 votes
1 answer
692 views

Salt used in Perkin Reaction

The Perkin reaction gives an α,β-unsaturated aromatic acid by the aldol condensation of an aromatic aldehyde and an acid anhydride, in the presence of an alkali salt of the acid. Here is an a diagram ...
Anubhab Das's user avatar
1 vote
1 answer
6k views

Why does 3-hydroxy-butan-2-one give positive Tollens' test?

Why does 3-hydroxy-butan-2-one give a positive Tollens' test despite the absence of an aldehyde group? What is the mechanism?
Archer's user avatar
  • 5,453
10 votes
1 answer
3k views

Is hydronium an electrophile, nucleophile, both or neither?

Is hydronium an electrophile or a nucleophile? I expected $\ce{H3O+}$ to be a nucleophile due to the presence of electrons in the $\ce{2p}$ orbitals of $\ce{O}$. But the answer key of the test states ...
Archer's user avatar
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