Newest Questions
47,367 questions
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Is there a possibility for NGP in the Hoffmann Bromamide reaction?
For example, in 2-(2-aminophenyl)acetamide, can the aniline group attack the carbon of the isocyanate intermediate to form a cyclic product? Or in butane diamide?
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Relationship between the Gibbs free energy and the equilibrium constant for heterogeneous reactions
According to my professor, the equilibrium constant can be determined as follows:
$$K_\mathrm{eq} = \exp\left(-\frac{\Delta G^\circ}{RT}\right)\tag{1}$$
My problem is that if liquids are present, then ...
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102
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How does vapor pressure depression impact boiling point?
I am learning about colligative properties in my high school chemistry class and I am having trouble understand the concept of vapor pressure. It is defined as the pressure of the vapor above the ...
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Is $\ce{N#PHR}$ a reasonable example of an acyl group?
I do some writing and categorising for Wikipedia to keep my research and technical writing sharp, and as part of that I recently found myself looking at IUPAC's definition of an acyl group. Most of ...
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2
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Testing Concentration of Ethyl Acetate in Fischer Esterification Through Acid-Base Titration
I am currently working on an IB Chemistry HL Internal Assessment and was considering investigating the equilibrium point of the following reaction in varying temperatures:
$$\ce{CH3CO2H + CH3CH2OH <...
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-4
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What really is "Dancing Resonance"? [duplicate]
This exact question has been asked before at What is "dancing resonance"?.
However, I found the responses there unsatisfactory. I think this is largely because many people are unfamiliar ...
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4
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1
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568
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Liquids which can self-ionise
We know that water can self-ionise,
$$\ce{H2O <<=> H+ + OH-}$$
With the equilibrium constant at $298K$ given by
$$K_\mathrm{w} = [\ce{H+}] [\ce{OH-}] = 10^{-14}$$
I also came across the fact ...
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If surfactants reduce the surface tension between air and water how do they end up reducing dissolved oxygen in water?
I have been researching the effects of surfactants on dissolved oxygen in water, and was surprised to find out that many research papers say that they end up reducing dissolved oxygen in water as the ...
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2
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147
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Why is thermodynamic equilibrium a reasonable assumption in tray-distillation columns?
I am studying the basics of binary tray-based distillation columns, and I have a general question. As I understand it, as the vapor flows up and the liquid flows down, at each tray, we assume that the ...
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Why are methyl and carbon bonded protons deshielded in the gas phase?
Essentially the title. I took NMR spectra of what I thought was acetone but it was partly shifted upfield so I assumed gas phase acetone as I would think it would be more deshielded. Upon looking ...
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Which side is endo in Diels-Alder reaction of cinnamaldehyde?
I understand that the endo product is usually favoured due to secondary orbital interactions. $\ $ When you have a dienophile like cinnamaldehyde, which has a phenyl group on one side and carbonyl on ...
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Mechanism of aryl enone alkoxyhalogenation
The major product obtained in the following reaction is:
After bromonium ion is formed, does the attack by methanol follow $\mathrm{S_N1}$ or $\mathrm{S_N2}$ mechanism? $\mathrm{S_N1}$ should result ...
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2
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1
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How to prevent residual copper chelation in polymer after THPTA-assisted CuAAC?
I am new to the click chemistry.
I modified 40% of carboxylic groups on poly-ʟ-glutamic acid with propargylamine, followed by click chemistry with 3-azido-1-propanamine according to the protocol:
...
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96
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No. of carbon atoms in each cyclic ring of Diamond
I'm a class 12th student, and this question came in a test of mine:
Diamond is formed by the fusion of several carbon tetrahedrons in which carbon atoms forms homocyclic rings. How many carbon atoms ...
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Al(acac)3:catechol Cationic Polymerization Initiation Mechanism
I'm working on a capstone project that involves a cationic homopolymerization of an epoxy resin using Al(acac)3 and catechol as the initiator. However, I cannot seem to find the initiating mechanism ...
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