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A 2008 study described a way to make primary amines directly from alcohols and ammonia using a ruthenium catalyst. The reported reaction produces water, and the researchers presented relatively mild conditions as a potential environmental and economic advantage—not as proof that the process is greener across its full life cycle.
What the reaction does
The method joins an alcohol and ammonia to form a primary amine, with water identified as the eliminated byproduct. Its selectivity matters: the target is a primary amine, rather than a mixture in which the nitrogen-containing product is alkylated further.
Chemistry World reported on 22 October 2008 that David Milstein and Chidambaram Gunanathan developed the catalytic approach using a ruthenium(II) complex supported by a tridentate pincer ligand. The report describes the conditions as relatively mild, but the available account does not give a temperature or pressure figure to quote. Chemistry World’s report
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The reaction mechanism was not fully clear in the contemporaneous report. The authors proposed a sequence in which the alcohol is first oxidized to an aldehyde. The aldehyde reacts with ammonia to form a hemiaminal; loss of water then gives an imine, which the catalyst reduces to the primary amine.
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- Alcohol oxidation forms an aldehyde, according to the proposed pathway.
- The aldehyde reacts with ammonia to form a hemiaminal.
- Elimination of water produces an imine.
- Catalyst-mediated reduction converts the imine to a primary amine.
This is the researchers’ proposed explanation, not a pathway established as definitive by the report.
Why the authors called it greener
Milstein described selective production of primary amines from alcohols and ammonia, with water elimination and without waste, under relatively mild conditions as desirable economically and environmentally. That statement is the researcher’s assessment. Water as the reported byproduct and relatively mild conditions are plausible process advantages, but they do not alone establish a lower overall environmental impact.
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- Triethanolamine (TEA) is an organic compound composed of a tri-alcohol & and an amine.
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The contemporaneous report supplies no comparative life-cycle assessment, quantified waste metric, or energy analysis. It therefore does not demonstrate that this route is greener than other routes across feedstock production, catalyst manufacture and recovery, solvent use, workup, or scale-up. Nor does the material establish industrial adoption.
What the 2008 report says about selectivity
Chemistry World noted that conventional reactions of alcohols and ammonia could lead to further alkylation, while the reported catalytic approach aimed selectively at primary amines. Walter Leitner of RWTH Aachen University called the reaction “formally a mono-alkylation of ammonia by a primary amine” and a “‘dream reaction’ indeed.” This was an expert’s comment, not an independent comparison of process performance.
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The report does not provide enough comparative experimental data to rank the approach against alternative processes. A rigorous comparison would need evidence on conversion and isolated yield, selectivity, temperature and pressure, catalyst loading and recovery, metal residues, substrate range, solvent and workup, waste, energy demand, and performance at scale.
Independent reader supportYour contribution helps us test, update, and keep practical guides available for everyone.Publication and related patent records
The study was published as C. Gunanathan and D. Milstein, “Selective Synthesis of Primary Amines Directly from Alcohols and Ammonia,” Angewandte Chemie International Edition, 2008, volume 47, pages 8661–8664. The NISER Organometallics and Catalysis Group bibliography also lists patent records WO 2010/018570 A1 and US 8586742 B2 under a title concerning ruthenium pincer catalysts for preparing amines from alcohols and ammonia. NISER publications bibliography
A bibliography listing patent records does not by itself establish their present legal status, commercial availability of the catalyst, or industrial use of the process.
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Best Value
- Triethanolamine (TEA) is used primarily in making surfactants, such as emulsifiers. It is a common ingredient in formulations used for both industrial and personal care products.
- Triethanolamine (TEA) is used in many cosmetic products to help balance pH levels, as well as to act as a cleansing base.
- Triethanolamine is an organic compound composed of a tri-alcohol & and an amine.
- Triethanolamine Balances pH and can neutralize formulations.
- As an emulsifier or stabilizer, Triethanolamine helps emulsions, such as creams and lotions.
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