Method for Synthesising Polyenes from Aldehydes

Simple SummaryContent extracted from patent full text and abstract with AI.

This invention provides a method for synthesizing polyenes—compounds with multiple conjugated double bonds—directly from aldehydes. The process occurs in a fluid phase using a metal-based solid catalyst, such as molybdenum carbide or oxide, creating a carbon-carbon double bond between aldehyde molecules. Unlike traditional methods, this technique enables high selectivity (especially for specific isomers like all-trans DPH), is performed in a single step, and allows for easy catalyst recovery and reuse.

Use CasesContent extracted from patent full text and abstract with AI.

• Industrial production of polyenes such as beta-carotene, which can be used as vitamin A precursors in pharmaceuticals and supplements.
• Synthesis of fluorescent markers like 1,6-diphenyl-1,3,5-hexatriene (DPH) for biological, biochemical, or materials science applications.
• Creation of polyene-based additives to improve the optical properties of polymers (e.g., for UV filters or LED components).
• Production of colorants, dyes, or functional materials requiring conjugated polyene structures.
• Manufacture of fine chemicals from renewable, biogenic aldehyde sources such as cinnamon bark oil.

BenefitsContent extracted from patent full text and abstract with AI.

• Enables a one-step synthesis of polyenes, reducing the number of steps and operational complexity compared to conventional multi-step methods.
• High stereoselectivity (up to 99%) for desired isomers, minimizing need for further isomerization and purification.
• Utilizes recyclable and recoverable solid catalysts, lowering material costs and environmental impact.
• Allows for the use of less expensive and more robust catalysts compared to precious metal alternatives (e.g., using transition metal carbides or oxides instead of platinum or gold).
• Reduces use of hazardous chemicals or reagents (e.g., avoids halogens, sulfur, and dissolved metal complexes), leading to safer, more environmentally friendly processes.
• Compatible with raw materials from renewable sources, supporting green chemistry initiatives.

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Patent Abstract

The invention relates to a method for synthesising polyenes by converting aldehydes, wherein carbonyl carbon atoms of at least two aldehydes form a polyene, in a fluid phase and in the presence of a catalyst, by forming a C=C double bond, and wherein a metal-based solid is used as a catalyst.