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Give the structure of the starting reactant for the reaction sequence shown below

Give the structure of the starting reactant for the reaction sequence shown below

Chemistry
Chemistry
10th Edition
ISBN:9781305957404
Author:Steven S. Zumdahl, Susan A. Zumdahl, Donald J. DeCoste
Publisher:Steven S. Zumdahl, Susan A. Zumdahl, Donald J. DeCoste
Chapter1: Chemical Foundations
Section: Chapter Questions
Problem 1RQ: Define and explain the differences between the following terms. a. law and theory b. theory and...
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Give the structure of the starting reactant for the reaction sequence shown below:
The image depicts a chemical reaction sequence consisting of three steps leading to the formation of an aldehyde. The process is as follows: 1. **BH₃·THF**: The first step involves the use of borane in tetrahydrofuran (THF). BH₃·THF is commonly used as a reagent in hydroboration reactions, which typically add a boron atom across a carbon-carbon double bond, resulting in the formation of an organoborane intermediate. 2. **H₂O₂, OH⁻**: The second step includes the use of hydrogen peroxide (H₂O₂) in the presence of a hydroxide ion (OH⁻). This step is indicative of an oxidation reaction, where the organoborane intermediate is oxidized, resulting in the conversion to an alcohol. 3. **PCC**: The third step utilizes Pyridinium chlorochromate (PCC), a reagent used to oxidize primary alcohols to aldehydes without further oxidation to carboxylic acids. **Chemical Structure Described**: The final product is an aldehyde with a benzene ring attached to a two-carbon chain ending in a formyl group (−CHO). This structure is indicative of phenylacetaldehyde, a compound with a benzene ring and an aldehyde group separated by a two-carbon chain. This reaction demonstrates the conversion of an alkene to an aldehyde via hydroboration-oxidation followed by selective oxidation using PCC.
Transcribed Image Text:The image depicts a chemical reaction sequence consisting of three steps leading to the formation of an aldehyde. The process is as follows: 1. **BH₃·THF**: The first step involves the use of borane in tetrahydrofuran (THF). BH₃·THF is commonly used as a reagent in hydroboration reactions, which typically add a boron atom across a carbon-carbon double bond, resulting in the formation of an organoborane intermediate. 2. **H₂O₂, OH⁻**: The second step includes the use of hydrogen peroxide (H₂O₂) in the presence of a hydroxide ion (OH⁻). This step is indicative of an oxidation reaction, where the organoborane intermediate is oxidized, resulting in the conversion to an alcohol. 3. **PCC**: The third step utilizes Pyridinium chlorochromate (PCC), a reagent used to oxidize primary alcohols to aldehydes without further oxidation to carboxylic acids. **Chemical Structure Described**: The final product is an aldehyde with a benzene ring attached to a two-carbon chain ending in a formyl group (−CHO). This structure is indicative of phenylacetaldehyde, a compound with a benzene ring and an aldehyde group separated by a two-carbon chain. This reaction demonstrates the conversion of an alkene to an aldehyde via hydroboration-oxidation followed by selective oxidation using PCC.
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