Catechol Production via Catalytic Hydrogenation of Inosose
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Solution Overview
Problem
The production of catechol from 2-deoxy-scyllo-inosose using hydroiodic acid is hindered by the need for expensive and corrosive reagents, making industrial-scale production challenging due to safety and environmental concerns.
Innovation Solution
A method involving the dehydration of 2-deoxy-scyllo-inosose to produce (4S,5R,6S)-4,5,6-trihydroxy-2-cyclohexene-1-one, followed by hydrogenation and dehydration reactions under mild conditions using a metal catalyst, such as palladium, to obtain catechol without the use of corrosive reagents.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If hydroiodic acid is used for reductive dehydration of 2-deoxy-scyllo-inosose, then catechol can be produced with 59% yield, but the process requires expensive and corrosive reagents in large quantities
Solution Approach 1:
The patent changes the chemical parameters by replacing hydroiodic acid with a catalytic system consisting of a metal complex (RuCl3, KOH) and formic acid. This substitution transforms the reaction conditions from requiring stoichiometric amounts of corrosive reagent to using catalytic amounts with a benign solvent system, making the process industrially feasible while maintaining high yield
Solution Approach 2:
The patent employs formic acid as a sacrificial reagent that is consumed in the reaction to generate hydrogen in situ, replacing the need for expensive and corrosive hydroiodic acid. The metal complex serves as a reusable catalyst, significantly reducing material costs and eliminating the need for special corrosion-resistant facilities
2Productivity
If hydroiodic acid is used for the reaction, then catechol production is achieved, but special facilities are needed due to corrosive property
Solution Approach 1:
The patent replaces corrosive hydroiodic acid with formic acid, a benign and inexpensive reagent that does not require special corrosion-resistant facilities. The metal complex catalyst enables the reaction to proceed under mild conditions, eliminating the need for expensive special facilities while maintaining high productivity
Solution Approach 2:
The patent creates a chemically benign reaction environment by using water as the solvent and formic acid as the reagent, replacing the highly corrosive hydroiodic acid system. This inert environment eliminates corrosion issues and removes the requirement for special facility infrastructure
3Productivity
If conventional methods are used, then catechol is produced, but environmental impact and operational costs increase
Solution Approach 1:
The patent uses formic acid as a renewable, biodegradable reagent that replaces persistent and harmful hydroiodic acid. The metal complex catalyst can be recovered and reused, minimizing waste. This approach significantly reduces environmental impact while maintaining high catechol production efficiency
Solution Approach 2:
The patent changes the reaction parameters to use milder, more environmentally benign conditions: water as solvent, formic acid as reagent, and a metal complex catalyst. These parameter changes eliminate the need for corrosive reagents and reduce environmental harm while preserving high productivity
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 approach allows for the production of catechol under mild conditions, reducing the environmental impact and operational costs, making it suitable for industrial-scale production using renewable resources like glucose.
Implementation Method 1
conducting hydrogenation and dehydration reactions of the (4S,5R,6S)-4,5,6-trihydroxy-2-cyclohexene-1-one
Implementation Method 2
reacting (4S,5R,6S)-4,5,6-trihydroxy-2-cyclohexene-1-one in the presence of a metal catalyst
Implementation Method 3
by dehydrating 2-deoxy-scyllo-inosose represented by the following formula (2) to produce (4S,5R,6S)-4,5,6-trihydroxy-2-cyclohexene-1-one
Implementation Method 4
reacting 2-deoxy-scyllo-inosose under hydrogen-reducing conditions while heating
Data Source
AI summary
Provided is a method for producing catechol in a one-pot by reacting (4S,5R,6S)-4,5,6-trihydroxy-2-cyclohexene-1-one under hydrogen-reducing conditions while heating.