Homework Answers
4. Weight of bromobenzene –
Given-
Weight of 5ml conical viol = 23.148g
Weight of 5ml conical viol and bromobenzene= 24.163g
Weight of bromobenzene = 24.163g - 23.146g = 1.015g
5. Calculate the theoretical yield of triphenylmethanol.
Weight of triphenylmethanol = 0.759g
The molar mass of Ph3COH is 260.3 g/mol.
So of moles Ph3COH = Weight of triphenylmethanol/ the molar mass triphenylmethanol
= 0.759g /260.3 g/mol = 0.0029 moles
Theoretical yield=0.0029 mol Ph₃COH × 260.3 g Ph3COH/1mol Ph₃COH= 0.759 g Ph3COH
7- Equation for reaction between-
(a.) Bromobenzene and magnesium
C6H5Br + Mg -----→ C6H5MgBr
(b) Phenylmagnesium bromide and benzophenone
(C6H5)2C=O + C6H5MgBr--------→ (C6H5)3COMgBr
(c)Product of b and acid
(C6H5)3COMgBr + H+------→ (C6H5)3COH + Mg2++ Br−
8 (a)
In the process of producing triphenylmethanol, some side products have been produced at the same time such as biphenyl.
C6H5MgBr +C6H5Br ---------->(C6H5)2
(b)The ether layer was concentrated over a steam bath at 60-80 °C until the triphenylmethanol was formed.
(c) Petroleum ether is used in the experiment in order to let the biphenyl dissolved in it so that this side product can be removed via recrystallization. Due to the higher polarity of the triphenylmethanol compared to biphenyl, the triphenylmethanol dissolve easily in the polar methyl petroleum ether.
Add Answer to:
Weight of 5-mL conical vial weight of 5-mL concial vial and bromobanzene weight of trlphenylnethanol product...
using pictures and a maximum of 10 words, explain why an oven-dried 5-ml conical vial and...
using pictures and a maximum of 10 words, explain why an oven-dried
5-ml conical vial and drying tube(step 1 and 2 of part 1) are used
in the reaction. do both please! also the notebook pages are the
procedure
(1) Using pictures and a maximum of 10 words, explain why an oven-dried 5-ml conical vial and drying tube (step 1 and 2 of Part 1) are used in the reaction. (2) After the addition of benzophenone to the mixture of...
The weight of triphenylmethanol is 0.060g QUESTIONS 1. (4 Points) What is the theoretical yield (in...
The weight of triphenylmethanol is 0.060g
QUESTIONS 1. (4 Points) What is the theoretical yield (in grams) and percent yield of your triphenyl- methanol product in this experiment? EXPERIMENTAL PROCEDURE All glassware used in a Grignard reaction must be scrupulously dried. Dry the following glassware in an oven at 110°C for at least 20 minutes: drying tube, Claisen adapter, 8 mL conical vial, 5 mL conical vial, air condenser, glass stirring rod, and a magnetic spinvane. DO NOT PLACE O-RINGS...
Grignard Reaction with a Ketone: Triphenylmethanol Introduction: The purpose of this lab is to prepare phenylmagnesium...
Grignard Reaction with a Ketone: Triphenylmethanol Introduction: The purpose of this lab is to prepare phenylmagnesium bromide, a Grignard reagent, and react it with benzophenone to give triphenylmethanol. Grignard reagents are very reactive and must be synthesized in an environment free of water or any other source of potential proton donor. Once made, the Grignard reagent will do a nucleophilic attack on the carbonyl carbon of the ketone, benzophenone. The result is an alkoxide that is then protonated to give...
What is the theoretical yield (in grams) and percent yield of your triphenylmethanol product in this...
What is the theoretical yield (in grams) and percent yield of your
triphenylmethanol product in this experiment? (Weight of
triphenylmethanol: 0.060g)
BACKGROUND AND THEORY The Grignard reaction was one of the first organometallic reactions discovered and is still one of the most useful synthetically. By reacting an organohalide (usually a bromide) with magnesium in ethereal solvent, carbon becomes a nucleophile. Grignard reagents are the starting points for the syntheses of many alkanes, primary, secondary, and tertiary alcohols, alkenes, and carboxylic...
Compound Mol. Weight (g) mmol amount (in g or mL) melting point (°C) Density (g/mL) Ref....
Compound
Mol. Weight (g)
mmol
amount
(in g or mL)
melting point (°C)
Density
(g/mL)
Ref.
bromobenzene
157.01
4.00
0.628
n/a
1.491
1
magnesium powder
120.37
4.00
0.097
n/a
n/a
2
ethyl ether
74.12
n/a
5.00
n/a
0.706
3
benzophenone
182.22
3.8
0.692
47-51
n/a
4
triphenylmethanol
260.33
160-163
n/a
5
5% HCl (aq.)
36.46
n/a
2.00
n/a
n/a
6
With this information, what is the theoretical yield of
triphenylmethanol?
HO Br Mg MgBr ether ether bromobenzene benzophenone triphenylmethanol
MW: Molecular Weight, mmol: Millimoles mL MW mmol equivalents reagent bromobenzene magnesium benzophenone diethyl ether theoretical...
MW: Molecular Weight, mmol: Millimoles
mL MW mmol equivalents reagent bromobenzene magnesium benzophenone diethyl ether theoretical product triphenylmethanol 24.30 b.65 74.123 O. 70(p
What is the theoretical yield (in grams) and percent yield of your triphenylmethanol product in this...
What is the theoretical yield (in grams) and percent yield of
your triphenylmethanol product in this experiment?
Assume that you have collected 0.15g of Triphenylmethanol for
the question.
Reaction Set Up ---- ALL glassware NEEDS to be DRY!!! Anhydrous CaCl2 -Drying tube 53 mg Mg turnings Claisen adapter + 2 mL anhydrous ether + 260 ul bromobenzene Air condenser Stir until reaction amber. Heat slowly to reflux for 10 min. Cool the reaction in ice bath for 5 min. Use...
i need help with post questions, thanks Product Isolation After stirring the reaction for 5 minutes...
i need help with post questions, thanks
Product Isolation After stirring the reaction for 5 minutes and allowing the reaction mixture to cool (the reaction can be exothermic), remove the Claisen head from the conical vial. Slowly add 3 M HCl(aq) drop-wise. The solid may need to be broken up with a stirring rod or a pipet. Continue to add acid until the aqueous phase (bottom layer) tests positive with pH paper. Extractions can be done using the conical funnel...
Preparation of Triphenylmethanol Using the Grignard Reaction. RH ROOH CO TO R-R MgBr 1.ether 2.11-SO/10 Icther...
Preparation of Triphenylmethanol Using the Grignard Reaction.
RH ROOH CO TO R-R MgBr 1.ether 2.11-SO/10 Icther Grignard reagents are highly reactive and can undergo undesirable RCOH TH₂O side reactions if impurities such as water, carbon dioxide, or oxygen are present. If the organohalogen is added to the R-Mg-X magnesium too quickly, undesired coupling reactions can also occur. In this experiment, you will use 0.015 moles of either benzophenone or ethyl benzoate as the recipient of the phenylmagnesium bromide and this...
I need help finding the theoretical yield (in grams) of triphenyl methanol product in this experiment....
I need help finding the theoretical yield (in grams) of
triphenyl methanol product in this experiment. PLEASE SHOW WORK, I
would like to learn the steps.
below is pictures of the procedure with amounts of chemicals
used
126 Experiment 10 EXPERIMENTAL PROCEDURE All glassware used in a Grignard reaction must be scrupulously dried, Dry the following glasstare in an af 110°C for at last 20 mini drying to Canadair 8 ml comical rial 5 ml con vial, air cond glass...
using pictures and a maximum of 10 words, explain why an oven-dried
5-ml conical vial and drying tube(step 1 and 2 of part 1) are used
in the reaction. do both please! also the notebook pages are the
procedure
(1) Using pictures and a maximum of 10 words, explain why an oven-dried 5-ml conical vial and drying tube (step 1 and 2 of Part 1) are used in the reaction. (2) After the addition of benzophenone to the mixture of...
The weight of triphenylmethanol is 0.060g
QUESTIONS 1. (4 Points) What is the theoretical yield (in grams) and percent yield of your triphenyl- methanol product in this experiment? EXPERIMENTAL PROCEDURE All glassware used in a Grignard reaction must be scrupulously dried. Dry the following glassware in an oven at 110°C for at least 20 minutes: drying tube, Claisen adapter, 8 mL conical vial, 5 mL conical vial, air condenser, glass stirring rod, and a magnetic spinvane. DO NOT PLACE O-RINGS...
What is the theoretical yield (in grams) and percent yield of your
triphenylmethanol product in this experiment? (Weight of
triphenylmethanol: 0.060g)
BACKGROUND AND THEORY The Grignard reaction was one of the first organometallic reactions discovered and is still one of the most useful synthetically. By reacting an organohalide (usually a bromide) with magnesium in ethereal solvent, carbon becomes a nucleophile. Grignard reagents are the starting points for the syntheses of many alkanes, primary, secondary, and tertiary alcohols, alkenes, and carboxylic...
Compound
Mol. Weight (g)
mmol
amount
(in g or mL)
melting point (°C)
Density
(g/mL)
Ref.
bromobenzene
157.01
4.00
0.628
n/a
1.491
1
magnesium powder
120.37
4.00
0.097
n/a
n/a
2
ethyl ether
74.12
n/a
5.00
n/a
0.706
3
benzophenone
182.22
3.8
0.692
47-51
n/a
4
triphenylmethanol
260.33
160-163
n/a
5
5% HCl (aq.)
36.46
n/a
2.00
n/a
n/a
6
With this information, what is the theoretical yield of
triphenylmethanol?
HO Br Mg MgBr ether ether bromobenzene benzophenone triphenylmethanol
MW: Molecular Weight, mmol: Millimoles
mL MW mmol equivalents reagent bromobenzene magnesium benzophenone diethyl ether theoretical product triphenylmethanol 24.30 b.65 74.123 O. 70(p
What is the theoretical yield (in grams) and percent yield of
your triphenylmethanol product in this experiment?
Assume that you have collected 0.15g of Triphenylmethanol for
the question.
Reaction Set Up ---- ALL glassware NEEDS to be DRY!!! Anhydrous CaCl2 -Drying tube 53 mg Mg turnings Claisen adapter + 2 mL anhydrous ether + 260 ul bromobenzene Air condenser Stir until reaction amber. Heat slowly to reflux for 10 min. Cool the reaction in ice bath for 5 min. Use...
i need help with post questions, thanks
Product Isolation After stirring the reaction for 5 minutes and allowing the reaction mixture to cool (the reaction can be exothermic), remove the Claisen head from the conical vial. Slowly add 3 M HCl(aq) drop-wise. The solid may need to be broken up with a stirring rod or a pipet. Continue to add acid until the aqueous phase (bottom layer) tests positive with pH paper. Extractions can be done using the conical funnel...
Preparation of Triphenylmethanol Using the Grignard Reaction.
RH ROOH CO TO R-R MgBr 1.ether 2.11-SO/10 Icther Grignard reagents are highly reactive and can undergo undesirable RCOH TH₂O side reactions if impurities such as water, carbon dioxide, or oxygen are present. If the organohalogen is added to the R-Mg-X magnesium too quickly, undesired coupling reactions can also occur. In this experiment, you will use 0.015 moles of either benzophenone or ethyl benzoate as the recipient of the phenylmagnesium bromide and this...
I need help finding the theoretical yield (in grams) of
triphenyl methanol product in this experiment. PLEASE SHOW WORK, I
would like to learn the steps.
below is pictures of the procedure with amounts of chemicals
used
126 Experiment 10 EXPERIMENTAL PROCEDURE All glassware used in a Grignard reaction must be scrupulously dried, Dry the following glasstare in an af 110°C for at last 20 mini drying to Canadair 8 ml comical rial 5 ml con vial, air cond glass...
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