Alkane Hydrogenation Using Cycloalkane for Isomer Co-Production
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Solution Overview
Problem
Conventional methods for synthesizing CF3CHFCHFCF3 primarily produce the (S), (R) isomer, with other isomers like (R), (R) and (S), (S) being difficult to achieve due to the dominance of syn addition reactions.
Innovation Solution
A method involving a hydrogenation reaction using a catalyst, cycloalkane compound, and hydrogen-containing gas to hydrogenate an alkene compound, promoting anti addition reactions and co-producing (S), (R), (R), and (S), (S) isomers of the alkane compound.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If a hydrogenation reaction is performed using conventional methods, then the (S), (R) isomer is produced, but other isomers like (R), (R) and (S), (S) are difficult to achieve
Solution Approach 1:
The invention changes the reaction parameters by introducing a cycloalkane compound as a reactant alongside the alkene compound and hydrogen gas. This parameter change enables anti-addition reactions to occur, which produces (R), (R) and (S), (S) isomers in addition to the conventional (S), (R) isomer, thereby achieving diverse isomer production
Solution Approach 2:
The cycloalkane compound acts as an intermediary substance that facilitates anti-addition reactions during hydrogenation. By introducing this intermediary reactant, the system enables formation of different isomers that would otherwise be difficult to achieve, thus resolving the contradiction between productivity and ease of manufacture
2Ease of manufacture
If syn addition reactions are used for hydrogenation, then the reaction is simple, but anti addition reactions are unlikely to occur
Solution Approach 1:
The cycloalkane compound serves as an intermediary that enables anti-addition reactions to occur during hydrogenation. This intermediary substance allows the system to achieve both syn and anti addition reactions, thereby producing a variety of isomers while maintaining reaction simplicity
Solution Approach 2:
By changing the reaction system to include a cycloalkane compound as a reactant, the invention enables anti-addition reactions to proceed alongside syn addition reactions. This parameter change allows diverse isomer production without complicating the overall reaction process
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
The method enables the co-production of all three isomers, providing building blocks with desired optical activity, enhancing productivity and reducing solvent use.
Implementation Method 1
reacting, in the presence of a catalyst and a cycloalkane compound... an alkene compound... and a hydrogen-containing gas to hydrogenate the alkene compound
Implementation Method 2
hydrogenate the alkene compound represented by formula (2)
Data Source
AI summary
In the presence of a catalyst and a cycloalkane compound represented by formula (3):wherein R3, R4, R5, R6, R7, R8, R9, and R10 are the same or different and each is a halogen atom, an alkyl group, or a fluoroalkyl group; an alkene compound represented by formula (2):wherein X1, X2, R1, and R2 are as defined above; is reacted with a hydrogen-containing gas to hydrogenate the alkene compound represented by formula (2), whereby an alkane compound represented by R1CHX1CHX2R2, wherein X1 and X2 are the same or different and each is a halogen atom, and R1 and R2 are the same or different and each is an alkyl group or a fluoroalkyl group; can be synthesized in such a manner that (S), (R)-isomer, (R), (R)-isomer, and (S), (S)-isomer are co-produced.