why should the sodium borohydride be added slowly, in small portions, rather than all at once? and provide the mechanism for the reaction of sodium borohydride with camphor.
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why should the sodium borohydride be added slowly, in small portions, rather than all at once? and provide the mechanism for the reaction of sodium borohydride with camphor.
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- When acetophenone, hydroxelamine hydrochloride, and sodium hydroxide are reacted to synthesize acetophenone oxime, why is it necessary to add hydrochloric acid after the reaction to make it acidic?How do you account for the fact that N-phenylacetamide (acetanilide) is less reactive toward electrophilic aromatic substitution than is aniline? -NHCCH, -NH, N-Phenylacetamide (Acetanilide) AnilineWhy do you wash the dichloromethane solution of your reductive amination product with sodium bicarbonate, rather than dilute aqueous HCl? a) Sodium bicarbonate is a good method of removing aldehydes from organic solvent.b) The amine product will be protonated by acid and remain in the aqueous layer as a salt.c) Sodium bicarbonate transfers the amine starting material into the aqueous layer.d) Sodium bicarbonate reacts with leftover NaBH(OAc)3 and removes it from the mixture.
- Sodium Borohydride + Vanillin Explain why the product is soluble in aqueous NaOH, but precipitates upon addition of HCl?What is the reaction mechanism for formaldehyde and phenol under acidic conditions?a) When prepping a Grignard reagent, iodine is usually added. Explain the importance of the amount of iodine added. Why is it not good to add a large quantity of iodine ? b) For the synthesise of triphenylmethanol, grignard reagent (phenylmagnesium bromide) is reacted with methyl benzoate. Explain why does the colour of the solution change from red to orange to yellow? c) What is the by-product of synthesis of triphenylmethanol?
- ¨ Aspirin is an ester and undergoes the typical reaction of esters. Write a mechanism for the reaction. Taking this in mind, why should you not recrystallize aspirin from hot water?Define what is reduction reaction, reducing agents, weak and strong reducing agents sodium borohydride reduction with benzophenone and sodium borohyride to get benzophenoneWhat mechanism does the reaction between benzyl chloride and triphenylphosphine go by? A lower yield of phosphonium salt is obtained in refluxing benzene than in xylene. Look up the boiling points for these solvents and explain why the difference in boiling points might influence of the yield? Why are the starting materials soluble in xylene but the product (phosphonium salt) is not soluble in xylene? We use petroleum ether to wash the phosphonium salt in filtration. Can we use water instead? Why?
- Predict the structures and provide an alternate reagent as a substitute foracetic anhydride.1. outline a procedure for separating a mixture of naphthalene (a neutral compound), toluic acid (an acidic compound), and p-bromoaniline (a basic compound). Assume that toluic acid and p-bromoaniline are completely insoluble in water. 2. The solubility of Lorazepam (a tranquilizer found in Emotival , Lorax, Wypax, and other prescription medicines) is 0.08mg/mL and 2.62mg/mL, in water and chloroform, respectively. Estimate the partition coefficient of lorazepam between chloroform and water. 3. The solubility of benzoic acid at 25 degrees Celsius in water and diethyl ether is 3.35 mg/mL and 0.353 g/mL, respectively. Estimate the percent recovery of benzoic acid in the organic phase, if a solution of benzoic acid in water is extracted with an equivalent volume of ether. [HINT-pay attention to the units] 4. The solubilities of cholesterol in water and chloroform are 0.550mg/100mL and 1.00g/5.25mL, respectively. Estimate the partition coefficient of cholesterol between chloroform and…how to produce benzylamine from benzene ?