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NABH4 OH C=0 H benzophenone diphenylmethanol Ketones are readily reduced to secondary alcohols by reaction with sodium borohydride. The aim of this experiment is to determine the time required to effect the complete conversion diphenylmethanol at room temperature. This investigation may be achieved by isolating and analyzing the reaction product after different reduction times. Infrared spectroscopy affords a convenient method of analysis; by comparing the IR spectrum of the crude reaction product at different time intervals one would expect to see the intensity of the hydroxyl absorption peak increase relative to that of the original carbonyl peak. From this you can deduce the optimum time for the reduction process at room temperature. of the ketone, benzophenone to Procedure Note the "reduction time" that the demonstrator assigns to your group. Different groups will be assigned different times, either t = 2.5 minutes, 10 minutes or 30 minutes. Add benzophenone (1g, 0.005mol) and ethanol (10ml) into a 250ml conical flask and swirl until it dissolves. In a separate small beaker make a solution of sodium borohydride (250mg) in water (2ml). You may carefully warm this under a warm tap to help dissolution if required. Prepare a mixture of iced water (80ml) containing 2M hydrochloric acid (20ml) in a 250ml beaker and store it on an ice bath. Test that your stopwatch works and when ready add the sodium borohydride solution in one go to the benzophenone solution in the conical flask. Immediately start timing and when you get to your assigned time (x minutes) quench the reaction by precipitating out the crude reaction product by addition of the cold acidified water mixture. Transfer the contents of the conical flask to a 250ml separating funnel and wash with an aliquot of diethyl ether (50ml). Run off the aqueous layer into a clean beaker, and collect the organic ether layer in a conical flask. Replace the aqueous layer into the separating funnel 3

NABH4 OH C=0 H benzophenone diphenylmethanol Ketones are readily reduced to secondary alcohols by reaction with sodium borohydride. The aim of this experiment is to determine the time required to effect the complete conversion diphenylmethanol at room temperature. This investigation may be achieved by isolating and analyzing the reaction product after different reduction times. Infrared spectroscopy affords a convenient method of analysis; by comparing the IR spectrum of the crude reaction product at different time intervals one would expect to see the intensity of the hydroxyl absorption peak increase relative to that of the original carbonyl peak. From this you can deduce the optimum time for the reduction process at room temperature. of the ketone, benzophenone to Procedure Note the "reduction time" that the demonstrator assigns to your group. Different groups will be assigned different times, either t = 2.5 minutes, 10 minutes or 30 minutes. Add benzophenone (1g, 0.005mol) and ethanol (10ml) into a 250ml conical flask and swirl until it dissolves. In a separate small beaker make a solution of sodium borohydride (250mg) in water (2ml). You may carefully warm this under a warm tap to help dissolution if required. Prepare a mixture of iced water (80ml) containing 2M hydrochloric acid (20ml) in a 250ml beaker and store it on an ice bath. Test that your stopwatch works and when ready add the sodium borohydride solution in one go to the benzophenone solution in the conical flask. Immediately start timing and when you get to your assigned time (x minutes) quench the reaction by precipitating out the crude reaction product by addition of the cold acidified water mixture. Transfer the contents of the conical flask to a 250ml separating funnel and wash with an aliquot of diethyl ether (50ml). Run off the aqueous layer into a clean beaker, and collect the organic ether layer in a conical flask. Replace the aqueous layer into the separating funnel 3

Organic Chemistry
Organic Chemistry
9th Edition
ISBN:9781305080485
Author:John E. McMurry
Publisher:John E. McMurry
Chapter17: Alcohols And Phenols
Section17.SE: Something Extra
Problem 71AP: A problem often encountered in the oxidation of primary alcohols to acids is that esters are...
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01:50 4G File Details 4CH003/UM1: Fundamentals of... Introduction NaBH4 OH C=0 H benzophenone diphenylmethanol Ketones are readily reduced to secondary alcohols by reaction with sodium borohydride. The aim of this experiment is to determine the time required to effect the complete conversion of the ketone, benzophenone to diphenylmethanol at room temperature. This investigation may be achieved by isolating and analyzing the reaction product after different reduction times. Infrared spectroscopy affords a convenient method of analysis; by comparing the IR spectrum of the crude reaction product at different time intervals one would expect to see the intensity of the hydroxyl absorption peak increase relative to that of the original carbonyl peak. From this you can deduce the optimum time for the reduction process at room temperature. Procedure Note the "reduction time" that the demonstrator assigns to your group. Different groups will be assigned different times, eithert = 2.5 minutes, 10 minutes or 30 minutes. Add benzophenone (1g, 0.005mol) and ethanol (10ml) into a 250ml conical flask and swirl until it dissolves. In a separate small beaker make a solution of sodium borohydride (250mg) in water (2ml). dissolution if required. You may carefully warm this under a warm tap to help Prepare a mixture of iced water (80ml) containing 2M hydrochloric acid (20ml) in a 250ml beaker and store it on an ice bath. Test that your stopwatch works and when ready add the sodium borohydride solution in one go to the benzophenone solution in the conical flask. Immediately start timing and when you get to your assigned time (x minutes) quench the reaction by precipitating out the crude reaction product by addition of the cold acidified water mixture. Transfer the contents of the conical flask to a 250ml separating funnel and wash with an aliquot of diethyl ether (50ml). Run off the aqueous layer into a clean beaker, and collect the organic ether layer in a conical flask. Replace the aqueous yer into the se funnel 3 and re-extract with a second fresh aliquot of diethylether (50ml). Discard the spent aqueous layer and combine the ether layer in the separating funnel. Wash the ether layer with a fresh aliquot of distilled water (50ml), remove the washing and transfer the organic layer into a clean 250ml conical flask. Dry the organic layer over anhydrous magnesium or sodium sulphate. Filter off the drying agent through a fluted filter paper and collect the filtrate directly in a round bottomed flask (placed on a cork ring). 1 Previous Next 3 000 Dashboard Calendar То-do Notifications Inbox LO
Transcribed Image Text:01:50 4G File Details 4CH003/UM1: Fundamentals of... Introduction NaBH4 OH C=0 H benzophenone diphenylmethanol Ketones are readily reduced to secondary alcohols by reaction with sodium borohydride. The aim of this experiment is to determine the time required to effect the complete conversion of the ketone, benzophenone to diphenylmethanol at room temperature. This investigation may be achieved by isolating and analyzing the reaction product after different reduction times. Infrared spectroscopy affords a convenient method of analysis; by comparing the IR spectrum of the crude reaction product at different time intervals one would expect to see the intensity of the hydroxyl absorption peak increase relative to that of the original carbonyl peak. From this you can deduce the optimum time for the reduction process at room temperature. Procedure Note the "reduction time" that the demonstrator assigns to your group. Different groups will be assigned different times, eithert = 2.5 minutes, 10 minutes or 30 minutes. Add benzophenone (1g, 0.005mol) and ethanol (10ml) into a 250ml conical flask and swirl until it dissolves. In a separate small beaker make a solution of sodium borohydride (250mg) in water (2ml). dissolution if required. You may carefully warm this under a warm tap to help Prepare a mixture of iced water (80ml) containing 2M hydrochloric acid (20ml) in a 250ml beaker and store it on an ice bath. Test that your stopwatch works and when ready add the sodium borohydride solution in one go to the benzophenone solution in the conical flask. Immediately start timing and when you get to your assigned time (x minutes) quench the reaction by precipitating out the crude reaction product by addition of the cold acidified water mixture. Transfer the contents of the conical flask to a 250ml separating funnel and wash with an aliquot of diethyl ether (50ml). Run off the aqueous layer into a clean beaker, and collect the organic ether layer in a conical flask. Replace the aqueous yer into the se funnel 3 and re-extract with a second fresh aliquot of diethylether (50ml). Discard the spent aqueous layer and combine the ether layer in the separating funnel. Wash the ether layer with a fresh aliquot of distilled water (50ml), remove the washing and transfer the organic layer into a clean 250ml conical flask. Dry the organic layer over anhydrous magnesium or sodium sulphate. Filter off the drying agent through a fluted filter paper and collect the filtrate directly in a round bottomed flask (placed on a cork ring). 1 Previous Next 3 000 Dashboard Calendar То-do Notifications Inbox LO
01:50 4G File Details 4CHO03/UM1: Fundamentals of... by isolating and analyzing the reaction product after different reduction times. Infrared spectroscopy affords a convenient method of analysis; by comparing the IR spectrum of the crude reaction product at different time intervals one would expect to see the intensity of the hydroxyl absorption peak increase relative to that of the original carbonyl peak. From this you can deduce the optimum time for the reduction process at room temperature. Procedure Note the "reduction time" that the demonstrator assigns to your group. Different groups will be assigned different times, either t = 2.5 minutes, 10 minutes or 30 minutes. Add benzophenone (1g, 0.005mol) and ethanol (10ml) into a 250ml conical flask and swirl until it dissolves. In a separate small beaker make a solution of sodium borohydride (250mg) in water (2ml). dissolution if required. You may carefully warm this under a warm tap to help Prepare a mixture of iced water (80ml) containing 2M hydrochloric acid (20ml) in a 250ml beaker and store it on an ice bath. Test that your stopwatch works and when ready add the sodium borohydride solution in one go to the benzophenone solution in the conical flask. Immediately start timing and when you get to your assigned time (x minutes) quench the reaction by precipitating out the crude reaction product by addition of the cold acidified water mixture. Transfer the contents of the conical flask to a 250ml separating funnel and wash with an aliquot of diethyl ether (50ml). Run off the aqueous layer into a clean beaker, and collect the organic ether layer in a conical flask. Replace the aqueous layer into the separating funnel 3 and re-extract with a second fresh aliquot of diethylether (50ml). Discard the spent aqueous layer and combine the ether layer in the separating funnel. Wash the ether layer with a fresh aliquot of distilled water (50ml), remove the washing and transfer the organic layer into a clean 250ml conical flask. Dry the organic layer over anhydrous magnesium or sodium sulphate. Filter off the drying agent through a fluted filter paper and collect the filtrate directly in a round bottomed flask (placed on a cork ring). Remove the ether solvent by rotary evaporation under reduced pressure (consult the demonstrator about this technique). The groups need to record the IR spectra of the starting material and the crude products from each of the different reduction times. Compare and contrast the spectra and comment upon the optimum time needed to effect reduction under the reaction conditions used. Questions 1. Other metal hydrides may be used to reduce carbonyl compounds, for example lithium aluminium hydride. Draw the structure and state the name of the reaction product/s if this reagent were used to reduce each of the following: a) butanal b) ethylethanoate 1 Previous Next 3 000 Dashboard Calendar То-do Notifications Inbox LO
Transcribed Image Text:01:50 4G File Details 4CHO03/UM1: Fundamentals of... by isolating and analyzing the reaction product after different reduction times. Infrared spectroscopy affords a convenient method of analysis; by comparing the IR spectrum of the crude reaction product at different time intervals one would expect to see the intensity of the hydroxyl absorption peak increase relative to that of the original carbonyl peak. From this you can deduce the optimum time for the reduction process at room temperature. Procedure Note the "reduction time" that the demonstrator assigns to your group. Different groups will be assigned different times, either t = 2.5 minutes, 10 minutes or 30 minutes. Add benzophenone (1g, 0.005mol) and ethanol (10ml) into a 250ml conical flask and swirl until it dissolves. In a separate small beaker make a solution of sodium borohydride (250mg) in water (2ml). dissolution if required. You may carefully warm this under a warm tap to help Prepare a mixture of iced water (80ml) containing 2M hydrochloric acid (20ml) in a 250ml beaker and store it on an ice bath. Test that your stopwatch works and when ready add the sodium borohydride solution in one go to the benzophenone solution in the conical flask. Immediately start timing and when you get to your assigned time (x minutes) quench the reaction by precipitating out the crude reaction product by addition of the cold acidified water mixture. Transfer the contents of the conical flask to a 250ml separating funnel and wash with an aliquot of diethyl ether (50ml). Run off the aqueous layer into a clean beaker, and collect the organic ether layer in a conical flask. Replace the aqueous layer into the separating funnel 3 and re-extract with a second fresh aliquot of diethylether (50ml). Discard the spent aqueous layer and combine the ether layer in the separating funnel. Wash the ether layer with a fresh aliquot of distilled water (50ml), remove the washing and transfer the organic layer into a clean 250ml conical flask. Dry the organic layer over anhydrous magnesium or sodium sulphate. Filter off the drying agent through a fluted filter paper and collect the filtrate directly in a round bottomed flask (placed on a cork ring). Remove the ether solvent by rotary evaporation under reduced pressure (consult the demonstrator about this technique). The groups need to record the IR spectra of the starting material and the crude products from each of the different reduction times. Compare and contrast the spectra and comment upon the optimum time needed to effect reduction under the reaction conditions used. Questions 1. Other metal hydrides may be used to reduce carbonyl compounds, for example lithium aluminium hydride. Draw the structure and state the name of the reaction product/s if this reagent were used to reduce each of the following: a) butanal b) ethylethanoate 1 Previous Next 3 000 Dashboard Calendar То-do Notifications Inbox LO
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