(a) The product formed is methyl L-valinate.
(b) The intermediate then undergoes decarboxylation to give the product, tert-butyl N-[(S)-2-amino-3-methylbutanoyl]carbamate.
(c) The product formed is L-valine.
(d) The product formed is L-valine.
(a) The reaction between L-valine and MeOH, H+ is an esterification reaction. The carboxylic acid group (-COOH) of L-valine reacts with the hydroxyl group (-OH) of methanol in the presence of an acid catalyst (H+) to form an ester. The product formed is methyl L-valinate.
(b) The reaction between L-valine and di-tert-butyl-dicarbonate is a carboxylation reaction. The amine group (-NH2) of L-valine reacts with the carbonyl group of di-tert-butyl-dicarbonate to form a carbamate intermediate. The intermediate then undergoes decarboxylation to give the product, tert-butyl N-[(S)-2-amino-3-methylbutanoyl]carbamate.
(c) The reaction between L-valine and NaOH, H2O is a hydrolysis reaction. The amide bond in L-valine is cleaved by the addition of a hydroxide ion (OH-) from NaOH in the presence of water to form the corresponding carboxylic acid and amine. The product formed is L-valine.
(d) The reaction between L-valine and HCl is an acid hydrolysis reaction. The amide bond in L-valine is cleaved by the addition of a proton (H+) from HCl to form the corresponding carboxylic acid and amine. The product formed is L-valine.
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PROBABLE QUESTION
Name the major product(s) of each of the following reactions between L-valine and (a) MeOH, H+ (b) Di-tert-butyl-dicarbonate (c) NaOH, H2o (d) HCI Include stereochemistry in your answer. DO NOT explicitly draw any hydrogen atoms in your structure or use abbreviations like OMe, COOH or Ph.
(a) The major product of the reaction between L-valine and MeOH, H+ is the methyl ester of L-valine.
(b) The major product of the reaction between L-valine and di-tert-butyl-dicarbonate is the tert-butyl ester of L-valine.
(c) The major product of the reaction between L-valine and NaOH, H₂O is L-valine.
(d) The major product of the reaction between L-valine and HCl is the hydrochloride salt of L-valine.
Determine what are the major product(s)?(a) In the presence of MeOH and an acid catalyst (H+), L-valine undergoes esterification to form the methyl ester of L-valine. This reaction involves the substitution of the carboxylic acid group with a methyl group from MeOH.
(b) Di-tert-butyl-dicarbonate (Boc₂O) reacts with the amino group of L-valine to form the tert-butyl ester of L-valine. The Boc protecting group replaces the amino group of L-valine, protecting it from further reactions.
(c) The reaction with NaOH and water does not introduce any new functional groups to L-valine. It simply results in the deprotonation of the carboxylic acid group, converting it to its conjugate base, L-valine.
(d) The reaction with HCl involves the protonation of the amino group in L-valine, resulting in the formation of the hydrochloride salt of L-valine. The carboxylic acid group remains unchanged.
Therfore, the following products are:
(a) The major product is the methyl ester of L-valine.
(b) The major product is the tert-butyl ester of L-valine.
(c) The major product is L-valine.
(d) The major product is the hydrochloride salt of L-valine.
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If you tested two samples of a particular pure substance, what would you find?
Answer:
The properties of a pure substance can be used to determine whether a sample is a pure substance or mixture because the characteristic properties of matter can be used to identify a sample. The result is a mixture called a composite.
Explanation:
Pure substances contains their own molecules only and not any impurity. Thus, when we tested it only shows the properties of its own.
What are pure substances?Pure substances are substances containing its pure composition without any impurities. For example water, fruits, acids etc. are pure substances and they does not have a combination other substances.
Mixtures are the combination of two or more pure substances, and the can be heterogenous or homogenous. Whereas, pure substances homogenous only thus forming only one phase.
When we tested mixtures qualitatively, they shows the properties of each individual components in it. Whereas, pure substances give inly its own characteristics.
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What does a nonpolar covalent bond show about the electronegativities of its
two atoms?
A. The electronegativity of both of the atoms is zero.
B. The electronegativities of the two atoms are equal.
O c. The difference in electronegativities of the two atoms is very
small.
O D. The difference in electronegativities is greater than 1.7.
Answer:
B. The electronegativities of the two atoms are equal.
In the chemical equation, H202-H2O + O2, the H2O2 is a
reactant
catalyst
product
solid
Answer:
product
Explanation:
Two students conduct the same experiment, but they get different results. What should the students do next?A.The students should check their procedure and tools for sources of error. B.Both students should throw out their data and start over. C.The students should compare data with other students and then use the data from the student who was closest to the rest of the class. D.The students should find the average of each data set and each report the average data.
Answer:
A.The students should check their procedure and tools for sources of error.
Explanation:
Answer:
I think it A
Explanation:
A 4 feet tall student went summing pool. He saw depth of water in pool less than 4 feet.Will he drowned.Write reason
Answer:
Question says , the height of the student = 4 feet, ... This means, if the student goes for swimming in the pool, however he does not know swimming, he will not be drowned until he is suffering from an injury or external force.
BRAINLIST!!
Water often has dissolved gases and other chemicals in it. When this water encounters rocks, the minerals in the rocks can be changed by the process of
A.
deposition
B.
erosion
C.
sedimentary mineralization
D.
chemical weathering.
paano mag ka jowa? any suggestions?
Well just wait for the right time to come, Because if you wait for the right time, you're gonna find someone who you really want- I'm bad at understanding tagalog
Answer:
Time will come
Explanation:
God has a plan for you
Describe what happens when a. piece of potassium is dropped into a trough of water coloured with red litmus.
Pls help,it's urgent!!!
Answer:
✔
Explanation:
Are humans made of matter ?
Answer:
The are we made of matter?
Which of the following compounds
does not contain a polar Covalent bond
A) CH2 CH₂ CH₂OH
B) ozone
C)CH₂ CH (NH₂) CH₂ CH2
D) CH4 CH₂ CH₂ Ch
H2 li
Answer:
the correct answer is letter B
Is it okay if you help me? I'm kind of in a tight spot here. Tysmmmmmmmmmmmmm o(❁´◡`❁)o!!
Answer:
C. Remains constant
Explanation:
Hope this helps (:
Which of the following is a limitation of using a model to study a natural event?
A.
The results of a model event are often much more accurate than those of the actual event.
B.
The model and the results it generates will have no relation at all to the actual event.
C.
The size and design of the model will be too similar to the actual event.
D.
The results of a model event may not be similar enough to the results of the actual event.
Answer:
D
Explanation:
why i say that is because take for example a volcano, when you make a model, you'll see what takes place in a real eruption but in real life the lava would burn things in its path, the model volcano may not. That's just an example
Answer:
D
Explanation:
I got it right on study island
In the lab, you are given a metal ball. You measure the mass of the ball to be 28 g. You place the ball in a graduated cylinder and the water level increases from 28.2 mL to 31.4 mL. What is the density of the metal ball? (round you answer to the nearest hundredth)
Answer:
Density = 8.75ml
Explanation:
Density = Mass / Volume
In this problem ...
Mass = 28 grams
Volume = 31.4ml - 28.2ml = 32ml (water displacement also)
∴Density = mass /volume = 28g/32ml = 8.75g/ml
Use the following chemical equation to answer the question. 4K(s) + O2(g) → 2 K2O(s). If a staff member at a laboratory has 12.0 grams of potassium metal, what is the theoretical yield of potassium oxide that the scientist could potentially produce from the reaction with oxygen gas?
A) 9.96 grams of K2O
B) 14.5 grams of K2O
C) 28.9 grams of K2O
D) 57.8 grams of K2O
Answer:14.5 grams of K2O
Explanation:
4K(s) + O2(g) → 2 K2O(s). If a staff member at a laboratory has 12.0 grams of potassium metal, 14.5 grams of K2O is the theoretical yield of potassium oxide that the scientist could potentially produce from the reaction with oxygen gas. Therefore, option B is correct.
What is theoretical yield ?The yield of a reaction is used to represent how much of a product is produced from that reaction. The theoretical yield is the quantity of product that stoichiometry predicts will be produced, whereas the actual yield is the amount that is actually produced.
Divide the ratio by the limiting reactant's molecular weight. The answer is the theoretical yield of the desired product in moles.
It is useful to know how much product will be created with specific reactant amounts before carrying out chemical reactions. The theoretical yield is what is meant by this. This method can be applied to determine the theoretical yield of a chemical reaction.
Thus, option B is correct.
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What is the boiling point for butane?
Answer:
30.2°F
Explanation:
Butane, the liquid that can be seen inside a transparent lighter, boils at a temperature slightly under the point at which water freezes. So why doesn't the butane in the lighter boil? Butane does indeed boil at about a degree below 32 degrees Fahrenheit, but this is true only at normal atmospheric pressure. (:
4 OT 5
A 35g chunk of metal at 130C was dropped in a bucket containing 220g of water at 25C. The final temperature of the mixture
was 300. What is the specific heat capacity of the metal?
(Specific heat for water: 4184 J/g C) Formula (m)(c)(T) = (m) (c)(T)
Answer: The specific heat capacity of metal is [tex]1.31J/g^0C[/tex]
Explanation:
[tex]Q_{absorbed}=Q_{released}[/tex]
As we know that,
[tex]Q=m\times c\times \Delta T=m\times c\times (T_{final}-T_{initial})[/tex]
[tex]m_1\times c\times (T_{final}-T_1)=-[m_2\times c\times (T_{final}-T_2)][/tex]
where,
[tex]m_1[/tex] = mass of metal = 35 g
[tex]m_2[/tex] = mass of water = 220 g
[tex]T_{final}[/tex] = final temperature = [tex]30^0C[/tex]
[tex]T_1[/tex] = temperature of metal = [tex]130^oC[/tex]
[tex]T_2[/tex] = temperature of water = [tex]25^oC[/tex]
[tex]c_1[/tex] = specific heat of metal = ?
[tex]c_2[/tex] = specific heat of water = [tex]4.184J/g^0C[/tex]
Now put all the given values in equation (1), we get
[tex]m_1\times c_1\times (T_{final}-T_1)=-[m_2\times c_2\times (T_{final}-T_2)][/tex]
[tex]35\times c_1\times (30-130)^0C=-[220g\times 4.184\times (30-25)][/tex]
[tex]c_1=1.31J/g^0C[/tex]
Therefore, the specific heat capacity of metal is [tex]1.31J/g^0C[/tex]
A group of 6 students was asked, "How many hours did you watch television last week?" Here are their responses.
7,9,4,13,13,16
Find the mean number of hours for these students.
If necessary, round your answer to the nearest tenth.
Answer:
10.3
Explanation:
How many electrons are needed in the outer energy levels of most atoms to be chemically stable?
Answer:
8 electrons
Explanation:
Increasing an airplane's speed or wing size does which of the following? O A. Creates a sonic boom B. Generates more lifting force O C. Increases the gravitational pull on the plane D. Decreases the amount of drag acting on the plane SUBMIT
Answer: B: generates more lifting force.... just got it correct
Explanation:
Answer:
B. Generates more lifting force
Explanation:
i took the quiz on Ap*x and it was correct
How many moles of hydrogen do you need to react with 0.85 moles of nitrogen?
Answer:
6 moles
Explanation:
You have a 1:3 ratio between nitrogen gas and hydrogen gas
Write the word and balanced chemical equations for the reaction between:
Aluminum + iron sulfate
Explanation:
Aluminium - Al
Iron Sulfate - FeSO4
The reaction is given as;
Al + FeSO₄ --> Al₂ (SO₄) ₃ + Fe
The balanced equation is given as;
2 Al + 3 FeSO₄ --> Al₂ (SO₄) ₃ + 3 Fe
In words it is given as;
Aluminium + Iron Sulfate --> Aluminium Sulfate + Iron
What category of organisms makes up the largest percent of the the fossils discovered? A. Land animals B. Marine animals C. Microorganisms
Answer:
Marine animals
Explanation:
A fossil is any remains of ancient life. Fossils can be body fossils, which are remains of the organism itself or trace fossils, such as burrows, tracks, or other evidence of activity(Lumen Learning).
Fossils of land animals are less common because they may not have been buried. However, land organisms may become buried underneath by mudslides or ash from a volcanic eruption, or covered by sand in a sandstorm.
Marine fossils are more common owing to quick burial. Marine animals that die near a river delta may be buried by sediment carried by the river. A storm at sea may shift sediment on the ocean floor, covering and helping to preserve skeletal remains(Lumen Learning).
Imran did an experiment to see how changing the
surface area of limestone affected the rate at which
it reacts with hydrochloric acid. He timed how long it
took for the reaction to produce 50 cm3 of carbon
dioxide gas. His results are shownin the picture
a) Explain why changing the surface area has the
effect that it does.
b) What must Imran have done to make this
experiment a fair test?
c) Write a word equation for this reaction (limestone
is calcium carbonate).
whatm iş your name msmsjwjnsnwjq
A chemical reaction that is expected to form 325.0 gof product only forms 123.8 g of product. What is the percent yield of this reaction?
38.1%
61.9%
201.2%
262.5%
Answer:
[tex]\boxed {\boxed {\sf A. \ 38.1 \%}}[/tex]
Explanation:
Percent yield is the ratio of the amount actually produced to how much could theoretically be produced. It is found using this formula:
[tex]\% \ yield = \frac{actual \ yield}{theoretical \ yield} *100[/tex]
For this reaction, the theoretical or expected yield is 325.0 grams. The actual yield is 123.8 grams.
[tex]\% \ yield = \frac{ 123.8 \ g }{325.0 \ g }*100[/tex]
Divide.
[tex]\% \ yield = 0.380923077 *100[/tex]
[tex]\% \ yield = 38.0923077[/tex]
Round to the nearest hundredth. The 9 in the hundredth place tells us to round the 0 to a 1 .
[tex]\% \ yield \approx 38.1[/tex]
The percent yield is about 38.1%
Answer:
38.1%
Explanation:
What is the acceleration due to gravity at Earth's surface?
Answer:
9.8 m/s2
Explanation:
That is to say, the acceleration of gravity on the surface of the earth at sea level is 9.8 m/s2.
what conversion factor is needed to calculate the number of atoms in 8.6 moles of Aluminum?
A. 1 mole/ 6.02x10^23 atmos
B. 6.02X10^23 atoms/ 1 mole
C. 1 mole/ 26.98zg
D. 26.982g/ 1 mole
Answer:hey did you ever get an answer? I need it for this exam
Explanation:
Is it okay if you help me? I'm kind of in a tight spot here. Tysmmmmmmmmmmmmm o(❁´◡`❁)o!!
Answer:
Not sure, but I think ot is chemical bonds because chemical potential energy are stored energy in a chemical bond. Hope this helps, thank you !!
Identify the type of intermolecular force for water, vegetable oil, and corn syrup.
Answer:
Intermolecular force for oil the dipole-dipole.
Intermolecular force for water hydrogen bonds.
Intermolecular force for vegetable oil nonpolar compound.
Intermolecular force for corn syrup fructose.
i need help writing a LAB REPORT about NATURAL SELECTION
(plus i don’t know what exact subject it is so i’m sorry if it’s the wrong subject)
Answer:
Translate from Ukrainian.
У цей приклад я візьму селекції пшениці. Коли ми будемо говорити про селекцію цього злака, то ми можемо отримати меньшу собівартість, та вартість вирощування. Збільшена урожайність, та менша потреба в гербіцидах, пестицидах, та інсектицидах це теж наслідок. Тому селекція це майбутнє!
Why is red tide dangerous to ocean animals?
Answer:
Karenia brevis produces toxins called brevetoxins that affect a variety of marine wildlife. Aquatic organisms can be exposed to brevetoxins in several ways: coming into contact with K. brevis cells or toxins in the water, ingesting cells, inhaling toxins and consuming toxic prey.
Explanation: