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Takeuchi K, Matsumoto K, Fukaya N, Osakada K, Sato K, Choi JC. Synthesis of organic carbamates as polyurethane raw materials from CO 2: the quest for metal alkoxides as regenerable reagents. Dalton Trans 2022; 51:15631-15643. [PMID: 36165998 DOI: 10.1039/d2dt02509d] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
It is well known that the utilization of carbon dioxide (CO2) for chemical materials is attracting research attention from the viewpoint of the carbon cycle. To contribute to the reduction of CO2 emission through such CO2 utilization reactions and counteract global climate change, the target compounds should be core chemical products that are distributed in large quantities and used for a long time. One such synthetic target is isocyanates that are used as raw materials for the production of polyurethanes, which are versatile polymeric materials with a service life of approximately 10 years. However, since direct synthesis of isocyanate from CO2 is quite difficult due to equilibrium constraints, a method via the use of its alcohol adduct, organic carbamate, as a precursor has been proposed. In this Perspective, we present regenerative metal alkoxide reactants, such as tin alkoxide, titanium alkoxide, and alkoxysilane, as environmentally benign reactants for the synthesis of organic carbamates from CO2. We also present a practical and environmentally friendly method for the highly efficient synthesis of various organic carbamates, including industrially important diisocyanate precursors, from 1 atm CO2 using alkoxysilanes. Furthermore, prospects for the practical application of these carbamate synthesis reactions are also discussed.
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Affiliation(s)
- Katsuhiko Takeuchi
- National Institute of Advanced Industrial Science and Technology (AIST), Tsukuba Central 5, 1-1-1 Higashi, Tsukuba 305-8565, Ibaraki, Japan.
| | - Kazuhiro Matsumoto
- National Institute of Advanced Industrial Science and Technology (AIST), Tsukuba Central 5, 1-1-1 Higashi, Tsukuba 305-8565, Ibaraki, Japan.
| | - Norihisa Fukaya
- National Institute of Advanced Industrial Science and Technology (AIST), Tsukuba Central 5, 1-1-1 Higashi, Tsukuba 305-8565, Ibaraki, Japan.
| | - Kohtaro Osakada
- National Institute of Advanced Industrial Science and Technology (AIST), Tsukuba Central 5, 1-1-1 Higashi, Tsukuba 305-8565, Ibaraki, Japan.
| | - Kazuhiko Sato
- National Institute of Advanced Industrial Science and Technology (AIST), Tsukuba Central 5, 1-1-1 Higashi, Tsukuba 305-8565, Ibaraki, Japan.
| | - Jun-Chul Choi
- National Institute of Advanced Industrial Science and Technology (AIST), Tsukuba Central 5, 1-1-1 Higashi, Tsukuba 305-8565, Ibaraki, Japan.
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Takeuchi K, Chen MY, Yuan HY, Koizumi H, Matsumoto K, Fukaya N, Choe YK, Shigeyasu S, Matsumoto S, Hamura S, Choi JC. N-Aryl and N-Alkyl Carbamates from 1 Atmosphere of CO 2. Chemistry 2021; 27:18066-18073. [PMID: 34779056 DOI: 10.1002/chem.202103587] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/04/2021] [Indexed: 11/09/2022]
Abstract
We have successfully isolated and characterized the zinc carbamate complex (phen)Zn(OAc)(OC(=O)NHPh) (1; phen=1,10-phenanthroline), formed as an intermediate during the Zn(OAc)2 /phen-catalyzed synthesis of organic carbamates from CO2 , amines, and the reusable reactant Si(OMe)4 . Density functional theory calculations revealed that the direct reaction of 1 with Si(OMe)4 proceeds via a five-coordinate silicon intermediate, forming organic carbamates. Based on these results, the catalytic system was improved by using Si(OMe)4 as the reaction solvent and additives like KOMe and KF, which promote the formation of the five-coordinated silicon species. This sustainable and effective method can be used to synthesize various N-aryl and N-alkyl carbamates, including industrially important polyurethane raw materials, starting from CO2 under atmospheric pressure.
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Affiliation(s)
- Katsuhiko Takeuchi
- National Institute of Advanced Industrial Science and Technology (AIST), Tsukuba Central 5, 1-1-1 Higashi, Tsukuba, 305-8565, Ibaraki, Japan
| | - Ming-Yu Chen
- National Institute of Advanced Industrial Science and Technology (AIST), Tsukuba Central 5, 1-1-1 Higashi, Tsukuba, 305-8565, Ibaraki, Japan.,Graduate School of Pure and Applied Sciences, University of Tsukuba, 1-1-1 Tennodai, Tsukuba, 305-8573, Ibaraki, Japan
| | - Hao-Yu Yuan
- National Institute of Advanced Industrial Science and Technology (AIST), Tsukuba Central 5, 1-1-1 Higashi, Tsukuba, 305-8565, Ibaraki, Japan
| | - Hiroki Koizumi
- National Institute of Advanced Industrial Science and Technology (AIST), Tsukuba Central 5, 1-1-1 Higashi, Tsukuba, 305-8565, Ibaraki, Japan
| | - Kazuhiro Matsumoto
- National Institute of Advanced Industrial Science and Technology (AIST), Tsukuba Central 5, 1-1-1 Higashi, Tsukuba, 305-8565, Ibaraki, Japan
| | - Norihisa Fukaya
- National Institute of Advanced Industrial Science and Technology (AIST), Tsukuba Central 5, 1-1-1 Higashi, Tsukuba, 305-8565, Ibaraki, Japan
| | - Yoong-Kee Choe
- National Institute of Advanced Industrial Science and Technology (AIST), Tsukuba Central 5, 1-1-1 Higashi, Tsukuba, 305-8565, Ibaraki, Japan
| | - Shinji Shigeyasu
- Polyurethane Research Laboratory Tosoh Corporation, 1-8 Kasumi, Yokkaichi, Mie, 510-8540, Japan
| | - Seiji Matsumoto
- Tosoh Corporation, 3-8-2 Shiba, Minato-ku, Tokyo, 105-8623, Japan
| | - Satoshi Hamura
- Tosoh Corporation, 3-8-2 Shiba, Minato-ku, Tokyo, 105-8623, Japan
| | - Jun-Chul Choi
- National Institute of Advanced Industrial Science and Technology (AIST), Tsukuba Central 5, 1-1-1 Higashi, Tsukuba, 305-8565, Ibaraki, Japan.,Graduate School of Pure and Applied Sciences, University of Tsukuba, 1-1-1 Tennodai, Tsukuba, 305-8573, Ibaraki, Japan
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Paparo A, Silvia JS, Spaniol TP, Okuda J, Cummins CC. Countercation Effect on CO
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Binding to Oxo Titanate with Bulky Anilide Ligands. Chemistry 2018; 24:17072-17079. [DOI: 10.1002/chem.201803265] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/27/2018] [Indexed: 11/06/2022]
Affiliation(s)
- Albert Paparo
- Institute of Inorganic ChemistryRWTH Aachen University Landoltweg 1 52074 Aachen Germany
- Current address: School of ChemistryMonash University PO Box 23 VIC 3800 Australia
| | - Jared S. Silvia
- Department of ChemistryMassachusetts Institute of Technology 77 Massachusetts Ave Cambridge MA 02139 USA
| | - Thomas P. Spaniol
- Institute of Inorganic ChemistryRWTH Aachen University Landoltweg 1 52074 Aachen Germany
| | - Jun Okuda
- Institute of Inorganic ChemistryRWTH Aachen University Landoltweg 1 52074 Aachen Germany
| | - Christopher C. Cummins
- Department of ChemistryMassachusetts Institute of Technology 77 Massachusetts Ave Cambridge MA 02139 USA
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Burianova VK, Bolotin DS, Mikherdov AS, Novikov AS, Mokolokolo PP, Roodt A, Boyarskiy VP, Dar’in D, Krasavin M, Suslonov VV, Zhdanov AP, Zhizhin KY, Kuznetsov NT. Mechanism of generation of closo-decaborato amidrazones. Intramolecular non-covalent B–H⋯π(Ph) interaction determines stabilization of the configuration around the amidrazone CN bond. NEW J CHEM 2018. [DOI: 10.1039/c8nj01018h] [Citation(s) in RCA: 48] [Impact Index Per Article: 8.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/31/2022]
Abstract
Three types of N(H)-nucleophiles were used to study the nucleophilic addition to the CN group of the 2-propanenitrilium closo-decaborate cluster giving N-closo-decaborato amidrazones.
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