All Questions
Tagged with experimental-chemistry organic-chemistry
364
questions
2
votes
1
answer
115
views
Why is the Molar mass of CO2 different than the weight of the sum of its particles?
The Molar mass of CO2 is stated to be 44.009 grams per mol
But in a calculation of the weight of each atom's particles((Electrons,Protons,Neutrons) times Avogadro's constant
I get 44.36 grams per mol
...
- 155
1
vote
0
answers
28
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How to avoid side reactions when making boronic esters (Homocoupling, Hydrogen specie)?
I have been working with suzuki couplings using substituted naphtalenes (typically 2-bromo-7-R-naphtalene) for a while now, and making the boronic specie is always a pain.
I can't make the boronic ...
3
votes
1
answer
180
views
Will a nitro aryl resist an halogen exchange using nBuLi?
I would like to boronate 2-bromo-6-nitro-naphtalene using nBuLi and quenching with 2-Isopropoxy-4,4,5,5-tetramethyl-1,3,2-dioxaborolane. Since there is no alpha proton to the nitro, and that the nitro ...
1
vote
0
answers
31
views
After adding the electrophile (BOMe3) in an halogen exchange (nBuLi) reaction, why do we leave the reaction stir overnight?
Very basic question.
In all the procedures for halogen exchange reactions reported using boronic compounds, the reaction is left to run ON at room temperature after addition of the boronic specie.
In ...
0
votes
0
answers
30
views
How does a conc. electrolyte solution extract water from a organic phase like diethyl ether or ethyl acetate?
In organic chemistry, often, during the last steps of a workup we use concentrated brine solution (NaCl) to "extract" the water from the organic layer, especially when we have an organic ...
- 51
0
votes
0
answers
42
views
If bromomethyl cyclopentane reacts with Alcoholic KOH with Heat. Can this produce some very minor products through E1 mechanism also?
I know that alcoholic KOH with heat will majorly give E2 mechanism products but I want to know if it is possible to get minor products through E1 mechanism here also.
The carbocation generated here ...
0
votes
1
answer
79
views
Minimum volume of benzene with percentage yield
The overall yield for the synthesis of N-phenylethanamide from benzene was found to be $35.2\%$.
Calculate the minimum volume of benzene, in $\mathrm{cm}^3$, required to make $10.0\, \mathrm{g}$ of N-...
- 127
4
votes
0
answers
50
views
Why cool a reaction down when adding reagents if you're only going to reflux subsequently?
I've seen several procedures using thionyl chloride (SOCl2) to make an ester, where the first step is to add the thionyl chloride to the reagent/solvent on ice or subzero temperature, followed ...
- 161
0
votes
1
answer
112
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Testing whether an unknown powder is wheat gluten (at home)?
Last week, I ordered wheat gluten to make seitan. I received some powder and attempted a recipe, which mixes 100g of water with 100g of gluten to form a sticky dough. However in my case, I only got a ...
- 109
7
votes
2
answers
642
views
Question about the differences of white and grey NaH properties
We are having some problems with the next reaction in our lab. As you can see, is the sulfonylation of an indole in which we use NaH (60% dispersion in mineral oil) as a base. This reaction goes with ...
- 81
0
votes
0
answers
60
views
How to remove hexane from nBuLi
As described in a paper, the authors removed the hexane from the nBuLi solution "under reduced pressure".
I was wondering if anyone had any experience on how to proceed safely with this ...
0
votes
0
answers
33
views
Is it possible to create a solid from PVDF solution?
I am working on a project where I am attempting to line an aluminium tube with PVDF. The finished wall thickness is required to be 4mm thick.
I have investigated such processes as injection moulding ...
2
votes
2
answers
257
views
Should I remove inhibitor from methyl acrylate?
I need to run multiple aza-Michael additions of methyl acrylate with various amines (dimethylamine, benzylamine, phenylethylamine, aniline, etc.) in order to get the bis-ester. I was wondering if the ...
- 21
5
votes
2
answers
371
views
Using potassium dichromate and sulfuric acid to clean test tubes after Tollens’ test
We had an experiment at school to find out the biomolecules contained in the different foodstuffs. After doing Tollens’ test which turned out to be positive, our teacher instructed us to clean the ...
- 828
1
vote
0
answers
37
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Does acetone react with acidic precipitate product in this reaction?
In this reaction procedure, It seems like there is a mistake in step 3 which would result in a 0% yield. From step 3, it looks like everything is fine, its performing the acid catalysed hydrolysis of ...
- 31