Organic Chemistry
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The given alkyne is shown below:
Draw the product formed when the alkyne is treated with H2, Pd/C.
What product would be obtained when the following alkyne is subjected to hydrogenation with a poisoned catalyst?
What product would be formed in the alkyne reduction shown below?
What product would be obtained in the alkyne reduction shown below?
What is the product of the reaction between the given triglyceride and reagents?
Determine the major product formed in a reaction between 3-hexyne and excess H2 in the presence of Pd/C.
What alkyne should be hydrogenated to produce the cis-alkene below?
Draw the product obtained when the given alkyne is subjected to hydrogenation with a poisoned catalyst.
Determine the product(s) formed in a reaction between H 2, Pd-CaCO3, Pd(OAc)2, quinoline (Lindlar's catalyst), and the alkyne given below.
Determine the reagent that can be used to perform the reaction given below.
Determine the product of the given hydrogenation reaction.
The hydrogenation reaction of an alkyne using the Lindlar catalyst always gives a cis-alkene. Explain why.
What alkyne would be reduced to give the trans-alkene shown below?
Determine the stereoisomers produced by the reactions indicated below.
What product would be formed in the alkyne reduction given below?
Show how the following transformations can be accomplished.
(i) oct-2-yne to cis-oct-2-ene.
(ii) hex-2-yne to trans-hex-2-ene.
What alkyne would be reduced to make the trans-alkene given below?
What product would be formed when the following alkyne is subjected to hydrogenation with a poisoned catalyst?
Determine the major product formed in a reaction between H2/Lindlar's catalyst and 3-hexyne.
What alkyne would be reduced to yield the trans-alkene shown below?
Draw the product formed in a reaction between Na in liquid NH3 at ―33°C and the following alkyne:
The reaction below shows the deprotonation step when pent-2-yne is reduced to pent-2-ene using ammonia. Determine the Keq for this reaction.
Aside from sodium amide, sodium ethylamide is a strong, non-nucleophilic base that can efficiently deprotonate terminal alkynes and is synthesized by reducing ethylamine. Is the mechanism for this reaction (to synthesize sodium ethylamide) correct?
Upon hydrogenation, what alkyne is converted to the cis-alkene given below?
Long, polarized bonds can be reduced similarly to how the π bond in an alkyne's C―C structure is. Is the mechanism in which sodium metal reduces a C―Cl bond correct, as seen in 1-chloropropane?
Consider the reaction that was reported to be performed electrochemically:
(i) Traditionally, what reagent was used to carry out this reaction?
(ii) Is the reaction that was reported to be performed electrochemically more or less hazardous to the environment?
Synthesize the following compound using ethyne.
Show how the following product can be prepared from the given starting material.
For each reagent below, draw the major product if it is allowed to react with 1 mol of hex-3-yne.
(i) excess H2, Pd/C
(ii) H2/Lindlar catalyst.
Describe the alkyne and the reagents needed to synthesize each of the following:
(i) trans-6-methylhept-3-ene
(ii) 1-butene
What reagent is used to transform 3-pentyne to pentane?
Draw the product(s) of the reaction shown below.
Draw the synthesis of the given molecule with acetylene as the starting material.
True or False. Acetylene would undergo decomposition when kept at very high temperatures (>1500 °C) for too long.
Hydration of symmetrical or terminal alkynes via oxymercuration gives good yields of a single compound. What is the product for the hydration of cyclooctyne?
Propose a synthesis to convert (Z)-cyclododecene to (E)-cyclododecene.
Identify the resulting product obtained from the given reaction.
Describe the synthesis of cis-3-heptene if 3-heptyne is chosen as the starting material.
Outline the synthesis of butane if 2-butyne is chosen as the starting material.
Provide the mechanism for the following reaction step:
What is the appropriate alkene starting material to synthesize ethylcyclopropane?
(i) How many alkenes can react with H2 and Pd/C catalyst to produce methylcyclohexane?(ii) Identify the most stable alkene in part (i).(iii) Identify alkene with the smallest heat of hydrogenation.
Determine the reagents that would be required to synthesize (Z)-3-heptene from 3-heptyne.
a. H2 and Pd/C
b. Sodium in liquid ammonia
c. H2 and Lindlar's catalyst
d. Sulfuric acid
Determine the reagents that would be required to synthesize (E)-3-heptene from 3-heptyne.
Draw the alkane formed in the hydrogenation reaction shown below.
Show how the following synthetic transformation can be accomplished. Give the structures of all intermediates.pent-2-yne → cis-pent-2-ene
Show how the following synthetic transformation can be accomplished. Give the structures of all intermediates.but-1-yne → butanal
Show how the following synthetic transformation can be accomplished. Give the structures of all intermediates.
pent-2-yne → trans-pent-2-ene