Research, development, and production of cyanide-containing compounds and nitrile compounds, as well as the research, development, and production of downstream derivatives of acrylonitrile
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This post was last edited by Long Hai/*n on 2015-6-11 21:02. Nitrile compounds, compounds containing nitrile groups (and their downstream derivatives such as acids, esters, amines, etc., resulting from hydrolysis or hydrogenation), and downstream derivatives of acrylonitrile (including ether nitriles, ether amines, etc.). We are developing a flexible cyanation platform that enables the production of a range of cyanated products. A series of problems will arise; I hope my friends can offer more guidance. Those who have resources or expertise are also asked to lend a hand. 1. Which products can be directly treated with cyanide ； 2. There are products containing cyano groups that have a good market demand; please help recommend them ； 3. Those with mature technologies are also requested to help with promotion. We are focusing on nitrile compounds, and we are indeed optimistic about the prospects of this market. Current products and technologies: (1) Ether nitrile compounds ； (2) Ether amine compounds ； Friends who are interested in such compounds please offer some advice, whether it’s regarding the market or technology; I’m looking forward to it eagerly.
Nitrile compounds, as one of the most important classes of chemical intermediates in fine chemicals, have a wide range of applications. If it were possible to synthesize these compounds easily while also addressing their safety and environmental concerns, then endless possibilities would arise. Everyone is welcome to share their ideas.
There are various methods for attaching a cyano group to organic compounds, such as ammonia oxidation and oxime dehydration, or by replacing it with sodium or potassium; however, each of these methods has its drawbacks. Is there a better way?
Companies engaged in fine chemicals can be mainly divided into three categories, which can temporarily be regarded as three groups. The first group consists of Lianhua Technology and Yaben Chemical. Lianhua Technology possesses the ammonia oxidation method. Eight core technologies including fluorine chemistry ； Yaben Chemical possesses its own unique technologies in the synthesis of chiral drugs. The second group is Wanchang Technology and Yongtai Technology. Wanchang Technology’s main advantage lies in its advanced technology for producing trimethyl esters ； Yongtai, on the other hand, specializes in fluorine-based fine chemicals. The third group consists of Tianma Refining and Jiujiujiu.
Lianhua Technology has introduced nitrile-based technology through the ammonia oxidation method; by utilizing new catalysts and advanced production equipment, its process is at the international leading level, features low costs, and is essentially non-toxic during operation. There are 300 tons of oxadiazon as well ； 500 tons of bupirimate ； 300 tons of carbofuran ； 300 tons of chunamine ； 300 tons of fluazinam ； 200 tons of cyclopyrimidine acid.
Nitrile compound 1: 3-cyanopyridine. Uses: Pharmaceutical industry, mainly used for the production of peripheral vasodilators such as nicotinol. Preparation method: Using 3-methylpyridine as the starting material, ammonolysis is carried out at 200–300 degrees.
Nitrile compound 2: 5-cyanoisobenzofuran-1-one, a key intermediate in the synthesis of the antidepressant citalopram; synthesized using sodium as a starting material under alkaline conditions
Nitrile compound 3: 3-Cyano**methyl ester. The existing process involves reacting 3-aldehyde**methyl ester with hydroxylamine hydrochloride, followed by dehydration (using acetic anhydride as the dehydrating agent). The purity of the product is greater than 98%, with a yield of 95.1%.
Nitrile compound 4: (S)-4-chloro-3-hydroxybutyronitrile. (S)-(-)-Epichlorohydrin + NaCN —— (ring opening) —— (S)-4-chloro-3-hydroxybutyronitrile —— (ethanololysis) —— (S)-4-chloro-3-hydroxybutyric acid ethyl ester —— (NaCN, trimethylsilane) —— (R)-(-)-4-cyano-3-hydroxybutyric acid ethyl ester. The overall yield was 57%.
Nitrilase exhibits high chemical, regio-, and stereoselectivity; saturated and unsaturated fatty nitriles as well as their aryl-substituted derivatives can be converted by nitrilase into the corresponding carboxylic acids. Glycolic acid is the simplest α-hydroxy acid, widely used in industries such as daily chemicals, textiles, and pharmaceuticals. Photochemically pure α-aryl acids are important intermediates in the total synthesis and asymmetric synthesis of drugs. α-Arylpropionic acid compounds such as naproxen, ibuprofen, and flurbiprofen can be obtained by the hydrolysis of the corresponding nitriles.
Nitrile compound 5: (R)-(-)-Mandelic acid Synthesis: Benzaldehyde + HCN —— Mandelic nitrile (racemic) —— (Resolution, hydrolysis) —— (R)-(-)-Mandelic acid