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UCLA Chemists Create 'Impossible' Molecules, Breaking Century-Old Rule

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Researchers at UCLA have created 'anti-Bredt olefins,' challenging a century-old chemical rule and opening new possibilities in drug design and green chemistry.

The breakthrough in producing anti-Bredt olefins signifies a major advancement in organic chemistry, potentially revolutionizing drug design.

The use of silylhalides as starting materials demonstrates innovative approaches to overcoming long-standing chemical challenges.

The research highlights the importance of geometric structure in molecular stability and reactivity, which is critical for drug interactions.

The discovery may lead to the development of new drugs that are more effective due to their complex structures.

Further research could uncover additional unconventional molecules, expanding the toolkit available for chemists and pharmaceutical developers.

The trend towards green chemistry may accelerate as new methods for drug manufacturing emerge from this research.


A groundbreaking achievement in organic chemistry has been made by a team of chemists at the University of California, Los Angeles (UCLA), who have successfully produced a new class of molecules known as 'anti-Bredt olefins.' This discovery challenges a century-old chemical rule established by German scientist Julius Bredt, which stated that forming a double bond at the bridgehead of small ring compounds was nearly impossible due to instability. The research, led by Professor Neil Garg, was published in the journal Science and opens new avenues for drug design and complex molecular structures.

The analogy used by Garg to explain their breakthrough likens the chemical structure to a motorcycle navigating a narrow bridge, where the bridge represents the small ring in the molecule and the motorcycle's turn symbolizes the double bond. The research team found that using silylhalides as starting materials allowed them to create these unstable anti-Bredt olefins under mild reaction conditions. By treating these compounds with fluoride, they catalyzed the formation of the new molecules, which are geometrically distorted and highly reactive.

The implications of this discovery extend beyond theoretical chemistry; they hold potential for modern drug development. Garg emphasized that the ability to create complex three-dimensional structures is crucial for designing drugs that effectively interact with target proteins in the body. The team is now exploring other unconventional molecules that were previously deemed impossible to synthesize, aiming to further expand the boundaries of organic chemistry.

Additionally, the research aligns with the principles of green chemistry, as the methods developed could lead to simpler drug manufacturing processes in the future, potentially reducing the use of harmful chemicals and streamlining production steps.

Clam Reports
Refs: | Aljazeera |

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