TLC Experiment
How to possibly identify structures using UV and Vanillin staining. For the reaction of
Citronellol to Citronellal
TLC Experiment How to possibly identify structures using UV and Vanillin staining. For the reaction of...
Why is the reaction of vanillin semicarbazone from vanillin run at a pH of about 5? And how is the pH of about 5 achieved in the experiment? The experiment uses a heated solution of semicarbazide hydrochloride and sodium acetate trihydrate mixed with 95% ethanol and water added with a hot solution of vanillin in 95% ethanol. I believe the acetic acid is used as a buffer to achieve the pH, but maybe its the heat? or possibly ethanol?
Write a chemical equation to show (a) the main reaction in this experiment, (b) why Vanillin is more soluble in aq. NaOH than plain water, (c) why adding aq. HCI precipitates the product. (d) What would happen if we tried to carry out the reduction in aq. HCl instead of aq. NaOH? 1. 2. How many moles of hydride can be transferred from each mole of NaBHa? 3. Of the reagents used today, which one is both corrosive and flammable?...
A student monitored the reaction progress of the reduction of 4-Nitrobenzaldehyde to 4-Nitrobenzyl alcohol using TLC. 30% ethyl acetate in petroleum ether was used as the elution solvent. TLC plates available in the laboratory were coated with the common absorbent silica gel (SiO2.xH2O) which contains polar hydroxyl (OH-) groups. c. The crude product moves slower than the starting material with the mobile phase in the TLC plate. Briefly explain a possible reason for the observation based on the chemical structures...
Include the proposed reaction (using structures) and mechanisms for this week's experiment, starting with benzyltriphenylphosphonium chloride and 9-anthraldehyde, and ending with 9-(2- phenylethenyl)anthracene. Draw the structures of the (2) and (E) isomers of 9-(2- phenylethenyl)anthracene. State which isomer you think will form (Z, E, or both?). Briefly explain your reasoning. pnci HR. RH NaOH HR2 PhẩP- - Pháp Bu Y- Ph R HR HR Z/Cis E/trans
if using piperonaldehyde, what would the answers be? Write an equation for the Aldol reaction that takes place for the aldehyde you used for this experiment. Show the exact structures for aldehyde and product (not "general" structures with "R" groups). 1 2 Compare the crude and purified melting points from this lab with the literature melting point of your compound. What do these data say about the purity of your "green chalcone before and after purification? 14 When only a...
In an experiment designed to identify a conjugated diene from Eucalyptus oil through a Diels-Alder reaction, it was concluded that the diene was alpha-phellandrene. The final part of the experiment asks for the following: Construct molecular models for malice anhydride and the diene. By moving their bonds around, find a way to connect them to make a model representing one form of the adduct. Disconnect and reconnect the diene and dienophile units until you have made models representing all possible...
How does this experiment (Heats of Reaction) illustrate the Law of Conservation of Energy? Explain using your experimental results. (I got experimental data of 57,671.2J; adding together experiment 1 and 2, while experiment three got a total of 64,486.3J. Yes, I know, a lot of experimental error) but I'm confused on what this has to do with Law of Conservation of Energy?
#1. Using curved arrows to symbolize electrons, write a complete reaction mechanism for the bromination of acetanilide to create the product. Include the resonance structures for any charged, delocalized intermediates that are involved. #2. Why does performing the experiment at 0 degrees Celsius help you identify some of the relative rates of reactivity? #3. Explain why a methyl group is a mildly activating group while a methoxy group is strong activating. #4. Explain why-- NH2 act as an activator and--...
What Rasthe plL of the soap solution? Using structures write a chemical reaction of the soap and water that explains this observation. 2pts 2.W (R The other prodoct of the saponification reaction is glycerol. What happens to the glycerol produced in the reaction? 2pts olento Frn ucerol wilth vscal to pic pat a Soa p, identical. How could you use melting point analysis to determine which compound is isolated? 2pts we hen n尺lti") pointob fa。GULSpongd ave Identical fun 1 ra...
which reaction requires more energy (a) or (b)? Briefly explain this result using resonance structures. from the calculations, it seems that reaction (a) requires more energy but i'm unsure as to how to use resonance to explain this, thanks! Part A: Enols and Enolates 1. Build acetone (1) and its corresponding enolate (2) show below in reaction (a). H₃ C CH3 HAC CH, You will need to delete a hydrogen atom in structure 2 by using the red star key....