Related Experiment Video
Updated: Mar 23, 2026
05:34
Efficient Synthesis of Polyfunctionalized Benzenes in Water via Persulfate-promoted Benzannulation of α,β-Unsaturated Compounds and Alkynes
Published on: December 16, 2019
8.4K
Reductive Deprotection of Silyl Groups with Wilkinson's Catalyst/Catechol Borane
Pranav Patel1, Chih-Tsung Chang, Namin Kang
1Claude Pepper Institute and Department of Chemistry, Florida Institute of Technology, 150 W. University Blvd., Melbourne, FL 32901, USA.
Tetrahedron Letters
|November 27, 2007
Summary
Selective silyl group deprotection is crucial in complex synthesis. A new mild, efficient method uses Wilkinson
Area of Science:
- Organic Chemistry
- Synthetic Chemistry
- Catalysis
Background:
- Traditional methods for silyl group deprotection (acids, fluorides) lack selectivity.
- This limitation hinders complex molecule synthesis, particularly natural products like prostaglandins.
- Selective protection/deprotection is vital for multi-silylated compounds.
Purpose of the Study:
- To develop a mild, selective, and efficient method for reductive silyl group deprotection.
- To address the limitations of existing deprotection strategies in complex organic synthesis.
Main Methods:
- Reductive deprotection of silyl groups.
- Utilized Wilkinson's catalyst with catechol borane.
- Also investigated catechol borane alone as a deprotecting agent.
Main Results:
- Achieved mild and selective reductive deprotection of silyl groups.
- Demonstrated efficiency in complex molecular settings.
- The new method offers improved yields compared to traditional approaches.
Conclusions:
- A novel, mild, and selective reductive deprotection method for silyl groups has been established.
- This method enhances the synthesis of complex molecules, including natural products.
- The use of Wilkinson's catalyst/catechol borane or catechol borane alone provides a valuable tool for synthetic chemists.
Related Concept Videos
01:14Aldehydes and Ketones to Alkenes: Wittig Reaction Mechanism
5.7K
The Wittig reaction, which converts aldehydes or ketones to alkenes using phosphorus ylides, proceeds through a nucleophilic addition‒elimination process.
The reaction begins with the nucleophilic addition between a phosphorus ylide and the carbonyl compound. Due to its carbanionic character, phosphorus ylide acts as a strong nucleophile and attacks the electrophilic carbonyl group. This generates a charge-separated dipolar intermediate called betaine. The negatively charged oxygen atom and...
The reaction begins with the nucleophilic addition between a phosphorus ylide and the carbonyl compound. Due to its carbanionic character, phosphorus ylide acts as a strong nucleophile and attacks the electrophilic carbonyl group. This generates a charge-separated dipolar intermediate called betaine. The negatively charged oxygen atom and...
5.7K
01:19Aldehydes and Ketones to Alkenes: Wittig Reaction Overview
10.9K
The Wittig reaction is the conversion of carbonyl compounds-aldehydes and ketones-to alkenes using phosphorus ylides, or the Wittig reagent. The reaction was pioneered by Prof. Georg Wittig, for which he was awarded the Nobel Prize in Chemistry.
10.9K
02:24Reduction of Alkynes to cis-Alkenes: Catalytic Hydrogenation
9.3K
Introduction
Like alkenes, alkynes can be reduced to alkanes in the presence of transition metal catalysts such as Pt, Pd, or Ni. The reaction involves two sequential syn additions of hydrogen via a cis-alkene intermediate.
Like alkenes, alkynes can be reduced to alkanes in the presence of transition metal catalysts such as Pt, Pd, or Ni. The reaction involves two sequential syn additions of hydrogen via a cis-alkene intermediate.
9.3K
01:10α-Alkylation of Ketones via Enolate Ions
4.0K
Ketones with α protons are deprotonated by strong bases like lithium diisopropylamide (LDA) to form enolate ions. The anion is stabilized by resonance, and its hybrid structure exhibits negative charges on the carbonyl oxygen and the α carbon. This ambident nucleophile can attack an electrophile via two possible sites: the carbonyl oxygen, known as O-attack, or the α carbon, known as C-attack. The nucleophilic attack via the carbanionic site is preferred. This is due to the...
4.0K
02:17Reduction of Alkenes: Asymmetric Catalytic Hydrogenation
4.0K
Catalytic hydrogenation of alkenes is a transition-metal catalyzed reduction of the double bond using molecular hydrogen to give alkanes. The mode of hydrogen addition follows syn stereochemistry.
The metal catalyst used can be either heterogeneous or homogeneous. When hydrogenation of an alkene generates a chiral center, a pair of enantiomeric products is expected to form. However, an enantiomeric excess of one of the products can be facilitated using an enantioselective reaction or an...
The metal catalyst used can be either heterogeneous or homogeneous. When hydrogenation of an alkene generates a chiral center, a pair of enantiomeric products is expected to form. However, an enantiomeric excess of one of the products can be facilitated using an enantioselective reaction or an...
4.0K
02:23Alcohols from Carbonyl Compounds: Reduction
13.1K
Reduction is a simple strategy to convert a carbonyl group to a hydroxyl group. The three major pathways to reduce carbonyls to alcohols are catalytic hydrogenation, hydride reduction, and borane reduction.
Catalytic hydrogenation is similar to the reduction of an alkene or alkyne by adding H2 across the pi bond in the presence of transition metal catalysts like Raney Ni, Pd–C, Pt, or Ru. Aldehydes and ketones can be reduced by this method, often under mild to moderate heat (25–100°C) and...
Catalytic hydrogenation is similar to the reduction of an alkene or alkyne by adding H2 across the pi bond in the presence of transition metal catalysts like Raney Ni, Pd–C, Pt, or Ru. Aldehydes and ketones can be reduced by this method, often under mild to moderate heat (25–100°C) and...
13.1K