Radical Halo-de-carboxylation Using TCCA and DCCA

Resolve Bottlenecks,
Find Innovative SolutionsGenerate Solutions

Solution Overview

Problem

Current methods for converting carboxylic acids to their corresponding organic halides, such as the Hunsdiecker reaction and Barton halo-de-carboxylation, often require heavy metal salts and are sensitive to water, making them inefficient and limited in application, particularly in the pharmaceutical industry.

Innovation Solution

A radical halo-de-carboxylation process using trichloroisocyanuric acid (TCCA) or dichloroisocyanuric acid (DCCA) in combination with a brominating agent to convert carboxylic acids into organic halides, avoiding the use of heavy metals and improving reaction efficiency.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Ease of manufacture

If heavy metal salts (silver, mercury) are used in Hunsdiecker reaction, then halo-de-carboxylation can be achieved, but the process becomes harmful and limited in pharmaceutical applications

Engineering Contradiction:

Improvehalo-de-carboxylation capabilityVSAvoidheavy metal contamination

Core Design Contradiction:

Ease of manufactureVSObject-affected harmful factors

Solution Approach 1:

The invention extracts and removes the harmful heavy metal components (silver, mercury) from the traditional Hunsdiecker reaction system, replacing them with environmentally friendly reagents such as TCCA and DCCA as chlorinating agents and sodium bromide as brominating agent, thereby eliminating heavy metal contamination while preserving the halo-de-carboxylation functionality

Inventive Principle:

Principle #2Taking out (Extraction)

Solution Approach 2:

The invention replaces expensive and harmful heavy metal salts with cheaper, non-toxic alternatives like TCCA, DCCA, and sodium bromide, which are environmentally friendly and suitable for pharmaceutical applications, effectively using disposable, non-harmful reagents to achieve the same chemical transformation

Inventive Principle:

Principle #27Cheap short-living objects (Disposable)

2Ease of manufacture

If traditional Hunsdiecker reaction conditions are used, then carboxylic acid conversion to halide is achieved, but the reaction becomes extremely sensitive to water presence

Engineering Contradiction:

Improvecarboxylic acid to halide conversionVSAvoidwater sensitivity

Core Design Contradiction:

Ease of manufactureVSReliability

Solution Approach 1:

The invention changes the reaction parameters by using TCCA/DCCA and sodium bromide in a different reaction system that operates with reduced water sensitivity compared to traditional Hunsdiecker conditions, allowing the reaction to proceed reliably even in the presence of trace water without requiring extremely anhydrous conditions

Inventive Principle:

Principle #35Parameter changes

Solution Approach 2:

The invention introduces TCCA/DCCA as chlorinating agents and sodium bromide as brominating agents that act as intermediaries to facilitate the halo-de-carboxylation reaction through a different mechanism (radical pathway) that is less sensitive to water presence compared to the traditional silver salt mechanism

Inventive Principle:

Principle #24Intermediary (Mediator)

3Ease of manufacture

If Barton halo-de-carboxylation or alternative methods are used, then carboxylic acid conversion is achieved, but heavy metals or difficult separation issues arise

Engineering Contradiction:

Improvecarboxylic acid conversion capabilityVSAvoidheavy metal use or separation difficulty

Core Design Contradiction:

Ease of manufactureVSObject-generated harmful factors

Solution Approach 1:

The invention extracts and eliminates heavy metal usage from the reaction system, replacing CuBr2, CuCl2, and other heavy metal-based reagents with TCCA, DCCA, and sodium bromide, thereby removing the harmful factor of heavy metal contamination while maintaining effective carboxylic acid conversion to halides

Inventive Principle:

Principle #2Taking out (Extraction)

Solution Approach 2:

The invention replaces heavy metal reagents and complex reagent systems with cheaper, non-toxic alternatives like TCCA, DCCA, and sodium bromide that do not generate harmful byproducts requiring difficult separation, making the process more environmentally friendly and industrially viable

Inventive Principle:

Principle #27Cheap short-living objects (Disposable)

Applied Scientific Principles

This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.

Function Achieved in This Case

This process effectively converts carboxylic acids to organic halides with high yield and purity, overcoming the limitations of existing methods by using environmentally friendly reagents and reducing sensitivity to water, thus enhancing the efficiency and applicability in industrial settings.

Implementation Method 1

Methodology Applied

Scientific EffectRadical halo-de-carboxylation: Chemical Bonding

Data Source

PatentUS10899687B2Process for the preparation of organic halides

Publication Date: 2021.01.26 TECHNION RES & DEV FOUND LTD

AI summary

The present invention provides a halo-de-carboxylation process for the preparation of organic chlorides, organic bromides and mixtures thereof, from their corresponding carboxylic acids, using a chlorinating agent selected from trichloroisocyanuric acid (TCCA), dichloroisocyanuric acid (DCCA), or combination thereof, and a brominating agent.