What spot on TLC would be higher for an eluent system of 1:1 acetone: hexane, when bupropion hydrochloride is spotted against m-chloropropiophenone?
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Greener synthesis of Bupropion Hydrochloride
What spot on TLC would be higher for an eluent system of 1:1 acetone: hexane, when
bupropion hydrochloride is spotted against m-chloropropiophenone?
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- There have been cases where wine has been mistakenly adulterated with ethylene glycol (,2-ethanediol, bp760 97.6 ˚C). As a forensic chemist, suggest how would you use GLC to prove conclusively that ethylene glycol was actually present?Using HPLC with a non-polar stationary phase (C18) and methanol as mobile phase, predict the elution sequence for the following compounds: benzil, benzoin, and tetraphenylcyclo- pentadienone. Rationalize your choice.Explain briefly the differences in Rf values of the pigments that you have separated from spinach juice. What properties must the pigment have to travel further in the chromatogram? Consider the structures of cholesterol and ?-carotene. Which do you think will have the highest Rf value if the solvent used was acetone - hexane (20:80)? Why?
- 1. The mixture below is seperated using HPLC with a octadecylsiloxane (nonpolar) stationary phase and a methonal (CH3OH)/water mobile phase. In what ofder will the compnents come off the column. What would happen to the order in which the components come off a polar colum if pentane is used as the mobile phase? Heptane, Heptanol, Butyl propyl etherA particular mixture was seperated into three components usin paper chromatography. the Rf value of dye A is 0.78, the Rf of dye B is 0.43 and the Rf of dye C is 0.19. What component of the mixture A,B,C is most attracted in the stationery phase and why?A thin layer chromatography experiment is planned to determine the Rf values of four compounds. List the following compounds in order of increasing Rf values from shortest to longest. (If B is shortest, then A, C, and D is longest, enter BACD )
- This is an illustration of TLC plates. The compounds used were syn-azobenzene (A) and anti-azobenzene (B). The difference between the two plates are that the first was placed in 15% methylene chloride in pet. ether and the second was placed in 30% methylene chloride in pet. ether. I calculated Rf values to be 0.47 mm for syn-azobenzene and 0.44 mm for anti-azobenzene in 15% while syn-azobenze had a Rf of 0.28 mm and 0.16 mm. Which solvent is best at separating and how does Rf help identify which isomer is which? I read that the anti is supposed to have a higher Rf but that is not the case here so I want to know if the syn is supposed to have the higher Rf and the anti is supposed to have the lower one.Briefly outline why cinnamaldehyde, cinnamic acid and cinnamyl alcohol travelled different distances on the TLC plate. The solution used to develop the TLC plate was a mixture of toluence and methanol (8:1.5)If a 0.0920 g sample of a 1:1 mixture of 4-nitroaniline and 2-nitroaniline was separated by column chromatography, and the recovered fractions weighed 0.0191 g ( 4-nitroaniline) and 0.0200 g (2-nitroaniline), what was the percent recovery of these two isomers? 20.6% 43.5% 21.7% 42.4%
- Using HPLC with a non-polar stationary phase (C18) and isopropanol as mobile phase, predict the elution sequence for the following compounds: benzil, benzoin, and 1,2,3,4- tetraphenylnaphthalene. Rationalize your choice. 2. Why does the proton of the hydroxyl group in benzoin appears at d=6.1 ppm in DMSO-d6 while it shows at d=4.6 ppm in CDCl3? 3. In the Aldol reaction, why does the product precipitate during the reaction?Use a suitable model to explain how separation and identification of a mixture of organic compounds can be achieved with a thin layer chromatographic (TLC) technique.1. Answer true or false for each statement: a) A TLC analysis is sufficient to characterize the purity of a compound. b) Carboxylic acids containing six or more carbon atoms per molecule are more soluble in2.5 M sodium hydroxide than in diethyl ether. c) Phenols containing six or more carbon atoms per molecule are more soluble in 2.5 M sodium hydroxidethan in diethyl ether. d) Benzoic acid and p-nitroaniline form water-soluble salts, whereas naphthalene does not. e) TLC analysis is the method of choice to determine the type of solid phase and eluent system that is required for a column chromatography separation. f) Mineral oil is an inappropriate heating fluid for determining the boiling points of samples that exceed 200°C (760 torr)? g) A heating bath containing mineral oil should not be used to determine the melting points of solids meltingabove 200 °C
