Iron, sulfur and purple light unlock greener carbon-carbon bond formation

The development of a greener method for creating carbon-carbon bonds in organic chemistry has been made possible by researchers at Rice University. Assistant Professor Julian West and his team have been working on a more affordable, rapid, and environmentally friendly approach to catalyzing these reactions.

In their latest breakthrough, published in the journal Nature Catalysis, West's team has adapted their existing method, which utilizes iron, sulfur, and purple light, to precisely bind a carbon atom to other carbons. This is a crucial step in constructing organic molecules.

Traditionally, this process has been limited to adding building blocks containing highly reactive elements like fluorine. However, fluorine is a "greedy" element that tends to hog shared electrons, making it difficult to manipulate carbon, which is known for its electron-sharing abilities. Carbon's stability and reluctance to bond with other elements pose a challenge in the realm of molecular architecture.

The team overcame this obstacle by temporarily making a carbon atom behave like fluorine using carboxylic acids, a common and inexpensive compound found in vinegar. By using two carboxylic acids together, they induced a temporary "selfishness" in the carbon, enabling it to hog shared electrons. This allowed them to use iron, sulfur, and purple light to attach the carbon to a carbon-carbon double bond.

The entire process is cost-effective and relies on widely available reagents. It generates minimal waste, with only a small amount of carbon dioxide produced, which is easy to manage. This new method not only makes carbon-carbon bond formation more affordable and flexible but also opens up possibilities for creating entirely new organic molecules, potentially leading to the discovery of future medicines.