Chemists develop carbon-carbon bond formation without toxic by-products

April 7, 2016, Tomsk Polytechnic University
Ksenia Kutonova

Tomsk Polytechnic University's chemists have found a way to avoid producing a large amount of toxic waste during carbon-carbon bond formation. Ordinary water instead of toxic solvents is preferred. New methods have been developed from a long-term palladium-catalyzed reaction study for which the 2010 Nobel Prize in chemistry was awarded.

Scientists from the Department of Biotechnology and Organic Chemistry have developed new substrates for "green" cross-coupling reactions. These chemical reactions are among the most common in the world , occurring in any process of organic synthesis. However, the laboratory production of organic molecules has a side effect—a large amount of waste.

"Toxic solvents are used in most organic synthesis reactions. They cause the largest volume of waste. Traditionally in the cross-coupling reactions, aromatic halides are utilized as reagents. These materials not only pollute the environment and destroy the ozone layer, but like other toxic substances, they are harmful to ," says Ksenia Kutonova, assistant at the Department of Biotechnology and Organic Chemistry.

The scientists obtained unique diazonium salts—water soluble, stable, safe and halogen-free arenediazonium tosylates. They allow using water as a solvent instead of toxic compounds. The main waste products are water and nitrogen in these . This gas is not dangerous to human health, since we are constantly surrounded by it (the air we breathe consists of about 80 percent nitrogen).

Substances created at TPU can be utilized everywhere—in the synthesis of medicines, cosmetics, plastics and monomers for subsequent polymerization.

Now, the scientists are modifying methods of using diazonium salts to make organic synthesis more environmentally friendly. This approach is called "green chemistry." Today, scientists around the world seek chemical processes that do less harm to the environment.

"Of course, can't be completely safe. But it is in our power to reduce the risk of the use of hazardous solvents. Thus, we try to direct traditional in a new path," says Marina Trusova, research engineer of Department of Biotechnology and Organic Chemistry.

Explore further: Chemists devise safer, cheaper, 'greener,' more efficient system for the synthesis of organic compounds

More information: Marina E. Trusova et al. Arenediazonium salts transformations in water media: Coming round to origins, Resource-Efficient Technologies (2016). DOI: 10.1016/j.reffit.2016.01.001

Ksenia V Kutonova et al. Matsuda–Heck reaction with arenediazonium tosylates in water, Beilstein Journal of Organic Chemistry (2015). DOI: 10.3762/bjoc.11.41

O. A. Gusel'nikova et al. First examples of arenediazonium 4-dodecylbenzenesulfonates: synthesis and characterization, Russian Chemical Bulletin (2014). DOI: 10.1007/s11172-014-0427-8

K. V. Kutonova et al. The first example of the copper-free chloro- and hydrodediazoniation of aromatic amines using sodium nitrite, CCl4, and CHCl3, Russian Chemical Bulletin (2012). DOI: 10.1007/s11172-012-0029-2

Related Stories

Carbon-carbon bond formation using flow chemistry

February 26, 2016

(Phys.org)—Traditionally, C-C bond forming reactions require the use of a precious metal, such as palladium, to catalyze the reaction. Precious metals are expensive and because pharmaceutical ingredients require a very ...

A breakthrough for organic reactions in water

June 26, 2014

Green-chemistry researchers at McGill University have discovered a way to use water as a solvent in one of the reactions most widely used to synthesize chemical products and pharmaceuticals.

Constructing complex molecules with atomic precision

June 1, 2015

Researchers in Russia have developed a waste-free and cost-effective approach for preparing complex organic molecules and revealing the physical nature of the processes that control the direction of chemical transformations.

All shook up for greener chemistry

June 1, 2015

Solvent-free chemistry, more common in Europe and Asia, is gaining notice among American manufacturers due to environmental concerns and rising costs in reducing toxic waste. Research out of the University of Cincinnati finds ...

Recommended for you

Light-based production of drug-discovery molecules

February 18, 2019

Photoelectrochemical (PEC) cells are widely studied for the conversion of solar energy into chemical fuels. They use photocathodes and photoanodes to "split" water into hydrogen and oxygen respectively. PEC cells can work ...

0 comments

Please sign in to add a comment. Registration is free, and takes less than a minute. Read more

Click here to reset your password.
Sign in to get notified via email when new comments are made.