Photodimerization of Trans-Cinnamic Acid for CBDA-4 Production

Resolve Bottlenecks,
Find Innovative SolutionsGenerate Solutions

Solution Overview

Problem

Current methods for producing cis-cyclobutane-1,2-dicarboxylic acid (CBDA-4) are labor-intensive and inefficient, resulting in small quantities due to the difficulty in reliably maintaining the metastable crystalline form of β-trans-cinnamic acid, which is necessary for photodimerization to CBDA-4.

Innovation Solution

A method involving melting trans-cinnamic acid, dissolving it in an organic solvent, creating a slurry with a poor solvent to maintain the β-form, and irradiating it with a UV source to photo-dimerize β-trans-cinnamic acid into CBDA-4, avoiding the formation of the stable α-form that leads to CBDA-1.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Productivity

If current methods are used to produce CBDA-4, then labor-intensive processes are employed, but productivity is low and only small quantities are produced

Engineering Contradiction:

Improveproduction quantity of CBDA-4VSAvoiddifficulty in maintaining metastable crystalline form

Core Design Contradiction:

ProductivityVSEase of manufacture

Solution Approach 1:

The patent changes physical parameters (temperature, solvent composition) to control the crystalline form of trans-cinnamic acid. By dissolving trans-cinnamic acid in a specific organic solvent and controlling precipitation conditions, the metastable β-form is obtained and maintained, enabling efficient photodimerization to CBDA-4 and achieving high productivity.

Inventive Principle:

Principle #35Parameter changes

Solution Approach 2:

The patent utilizes phase transition of trans-cinnamic acid from solid to dissolved state and back to solid crystalline form. By controlling the dissolution in organic solvent and subsequent precipitation, the metastable β-crystalline form is generated and maintained, which is essential for high-yield photodimerization to CBDA-4.

Inventive Principle:

Principle #36Phase transitions

2Reliability

If trans-cinnamic acid is processed to maintain metastable β-form, then photodimerization to CBDA-4 can proceed, but the stable α-form forms instead which produces CBDA-1

Engineering Contradiction:

Improvereliability of CBDA-4 productionVSAvoidstability of crystalline form

Core Design Contradiction:

ReliabilityVSStability of the object's composition

Solution Approach 1:

The patent introduces an organic solvent as an intermediary medium to control the crystallization process. The solvent mediates between the stable α-form and metastable β-form, enabling selective formation and maintenance of the β-form through controlled dissolution and precipitation, ensuring reliable CBDA-4 production.

Inventive Principle:

Principle #24Intermediary (Mediator)

Solution Approach 2:

The patent performs preliminary dissolution of trans-cinnamic acid in organic solvent before precipitation. This preliminary action creates a supersaturated solution that, upon controlled precipitation, yields the metastable β-form crystals. The preliminary dissolution step is crucial for obtaining the desired crystalline form needed for reliable CBDA-4 production.

Inventive Principle:

Principle #10Preliminary action

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 method allows for the reliable and scalable production of CBDA-4, which is stable and thermally cleavable, making it suitable for polymer synthesis and other applications.

Implementation Method 1

irradiating the slurry from step c with a UV irritation source to photo-dimerize β-trans-cinnamic acid and form cis-cyclobutane-1,2-dicarboxylic acid

Methodology Applied

Scientific EffectPhotodimerization: Photopolymerisation

Data Source

PatentUS11453635B2Method of making cyclobutane-1, 2-diacids degradable building blocks for materials

Publication Date: 2022.09.27 UNIVERSITY OF NORTH DAKOTA

AI summary

A method of making cyclobutane-1,2-diacid building blocks includes using trans-cinnamic acid in its beta form (head to head packing) and photodimerizing the trans-cinnamic acid to create cis-cyclobutane-1,2-dicarboxylic acid (CBDA-4).