1
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Götz T, Falk A, Bauer JO. Molecular Scissors for Tailor-Made Modification of Siloxane Scaffolds. Chemistry 2021; 28:e202103531. [PMID: 34761842 PMCID: PMC9299477 DOI: 10.1002/chem.202103531] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/29/2021] [Indexed: 01/07/2023]
Abstract
The controlled design of functional oligosiloxanes is an important topic in current research. A consecutive Si−O−Si bond cleavage/formation using siloxanes that are substituted with 1,2‐diaminobenzene derivatives acting as molecular scissors is presented. The method allows to cut at certain positions of a siloxane scaffold forming a cyclic diaminosilane or ‐siloxane intermediate and then to introduce new functional siloxy units. The procedure could be extended to a direct one‐step cleavage of chlorooligosiloxanes. Both siloxane formation and cleavage proceed with good to excellent yields, high regioselectivity, and great variability of the siloxy units. Control of the selectivity is achieved by the choice of the amino substituent. Insight into the mechanism was provided by low temperature NMR studies and the isolation of a lithiated intermediate.
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Affiliation(s)
- Tobias Götz
- Institut für Anorganische Chemie, Fakultät für Chemie und Pharmazie, Universität Regensburg, Universitätsstraße 31, D-93053, Regensburg, Germany
| | - Alexander Falk
- Institut für Anorganische Chemie, Fakultät für Chemie und Pharmazie, Universität Regensburg, Universitätsstraße 31, D-93053, Regensburg, Germany
| | - Jonathan O Bauer
- Institut für Anorganische Chemie, Fakultät für Chemie und Pharmazie, Universität Regensburg, Universitätsstraße 31, D-93053, Regensburg, Germany
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2
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Abstract
Abstract
C23H28OSi, monoclinic, P21/c (no. 14), a = 14.2882(11) Å, b = 17.8169(10) Å, c = 7.6201(6) Å, β = 103.780(8)°, V = 1884.0(2) Å3, Z = 4, R
gt
(F) = 0.0538, wR
ref
(F
2) = 0.1241, T = 173(2) K.
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Affiliation(s)
- Jonathan O. Bauer
- Institut für Anorganische Chemie, Fakultät für Chemie und Pharmazie, Universität Regensburg , Universitätsstraße 31, D-93053 Regensburg , Germany
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3
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Bauer JO. Crystal Structure and Hirshfeld Surface Analysis of Trimethoxy(1‐naphthyl)silane – Intermolecular Interactions in a One‐Component Single‐Crystalline Trimethoxysilane. Z Anorg Allg Chem 2021. [DOI: 10.1002/zaac.202100027] [Citation(s) in RCA: 7] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/23/2023]
Affiliation(s)
- Jonathan O. Bauer
- Institut für Anorganische Chemie Fakultät für Chemie und Pharmazie Universität Regensburg Universitätsstraße 31 D-93053 Regensburg Germany
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4
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Espinosa‐Jalapa NA, Bauer JO. Controlled Synthesis and Molecular Structures of Methoxy‐, Amino‐, and Chloro‐Functionalized Disiloxane Building Blocks. Z Anorg Allg Chem 2020. [DOI: 10.1002/zaac.202000049] [Citation(s) in RCA: 10] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/21/2022]
Affiliation(s)
- Noel Angel Espinosa‐Jalapa
- Institut für Anorganische Chemie Fakultät für Chemie und Pharmazie Universität Regensburg Universitätsstraße 31 93053 Regensburg Germany
| | - Jonathan O. Bauer
- Institut für Anorganische Chemie Fakultät für Chemie und Pharmazie Universität Regensburg Universitätsstraße 31 93053 Regensburg Germany
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5
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Naganawa Y, Guo H, Sakamoto K, Nakajima Y. Nickel‐Catalyzed Selective Cross‐Coupling of Chlorosilanes with Organoaluminum Reagents. ChemCatChem 2019. [DOI: 10.1002/cctc.201900047] [Citation(s) in RCA: 15] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/07/2023]
Affiliation(s)
- Yuki Naganawa
- Interdisciplinary Research Center for Catalytic ChemistryNational Institute of Advanced Industrial Science and Technology Tsukuba Ibaraki 305-8565 Japan
| | - Haiqing Guo
- Interdisciplinary Research Center for Catalytic ChemistryNational Institute of Advanced Industrial Science and Technology Tsukuba Ibaraki 305-8565 Japan
| | - Kei Sakamoto
- Interdisciplinary Research Center for Catalytic ChemistryNational Institute of Advanced Industrial Science and Technology Tsukuba Ibaraki 305-8565 Japan
| | - Yumiko Nakajima
- Interdisciplinary Research Center for Catalytic ChemistryNational Institute of Advanced Industrial Science and Technology Tsukuba Ibaraki 305-8565 Japan
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6
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Matsumoto K, Shimada S, Sato K. Sequence-Controlled Catalytic One-Pot Synthesis of Siloxane Oligomers. Chemistry 2018; 25:920-928. [PMID: 30070402 DOI: 10.1002/chem.201803565] [Citation(s) in RCA: 33] [Impact Index Per Article: 5.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/11/2018] [Indexed: 11/07/2022]
Abstract
Silicones are highly valuable poly- and oligomeric materials with a broad range of applications due to their outstanding physicochemical properties. The core framework of silicone materials consists of siloxane (Si-O-Si) bonds, and thus, the development of efficient siloxane-bond-forming reactions has attracted much attention. However, these reactions, especially "catalytic" siloxane-bond-forming reactions that enable the selective formation of unsymmetrical siloxane bonds, remain relatively underdeveloped. On the other hand, controlled iteration has become a powerful tool for the sequence-controlled synthesis of poly- and oligomeric compounds. Recently, control over the siloxane sequence has been achieved by the one-pot iteration of a B(C6 F5 )3 -catalyzed dehydrocarbonative cross-coupling of alkoxysilanes with hydrosilanes and a B(C6 F5 )3 -catalyzed hydrosilylation of carbonyl compounds. Thus, it is now possible to generate linear, branched, and cyclic sequence-specific oligosiloxanes in a highly selective manner under chloride-free conditions.
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Affiliation(s)
- Kazuhiro Matsumoto
- Interdisciplinary Research Center for Catalytic Chemistry (IRC3), National Institute of Advanced Industrial, Science and Technology (AIST), Tsukuba Central 5, 1-1-1 Higashi, Tsukuba, Ibaraki, 305-8565, Japan
| | - Shigeru Shimada
- Interdisciplinary Research Center for Catalytic Chemistry (IRC3), National Institute of Advanced Industrial, Science and Technology (AIST), Tsukuba Central 5, 1-1-1 Higashi, Tsukuba, Ibaraki, 305-8565, Japan
| | - Kazuhiko Sato
- Interdisciplinary Research Center for Catalytic Chemistry (IRC3), National Institute of Advanced Industrial, Science and Technology (AIST), Tsukuba Central 5, 1-1-1 Higashi, Tsukuba, Ibaraki, 305-8565, Japan
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7
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Matsumoto K, Oba Y, Nakajima Y, Shimada S, Sato K. One-Pot Sequence-Controlled Synthesis of Oligosiloxanes. Angew Chem Int Ed Engl 2018. [DOI: 10.1002/ange.201801031] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
Affiliation(s)
- Kazuhiro Matsumoto
- Interdisciplinary Research Center for Catalytic Chemistry (IRC3); National Institute of Advanced Industrial Science and Technology (AIST); Tsukuba Central 5 1-1-1 Higashi Tsukuba Ibaraki 305-8565 Japan
| | - Yuki Oba
- Interdisciplinary Research Center for Catalytic Chemistry (IRC3); National Institute of Advanced Industrial Science and Technology (AIST); Tsukuba Central 5 1-1-1 Higashi Tsukuba Ibaraki 305-8565 Japan
| | - Yumiko Nakajima
- Interdisciplinary Research Center for Catalytic Chemistry (IRC3); National Institute of Advanced Industrial Science and Technology (AIST); Tsukuba Central 5 1-1-1 Higashi Tsukuba Ibaraki 305-8565 Japan
| | - Shigeru Shimada
- Interdisciplinary Research Center for Catalytic Chemistry (IRC3); National Institute of Advanced Industrial Science and Technology (AIST); Tsukuba Central 5 1-1-1 Higashi Tsukuba Ibaraki 305-8565 Japan
| | - Kazuhiko Sato
- Interdisciplinary Research Center for Catalytic Chemistry (IRC3); National Institute of Advanced Industrial Science and Technology (AIST); Tsukuba Central 5 1-1-1 Higashi Tsukuba Ibaraki 305-8565 Japan
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8
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Matsumoto K, Oba Y, Nakajima Y, Shimada S, Sato K. One-Pot Sequence-Controlled Synthesis of Oligosiloxanes. Angew Chem Int Ed Engl 2018; 57:4637-4641. [DOI: 10.1002/anie.201801031] [Citation(s) in RCA: 45] [Impact Index Per Article: 7.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/24/2018] [Indexed: 11/09/2022]
Affiliation(s)
- Kazuhiro Matsumoto
- Interdisciplinary Research Center for Catalytic Chemistry (IRC3); National Institute of Advanced Industrial Science and Technology (AIST); Tsukuba Central 5 1-1-1 Higashi Tsukuba Ibaraki 305-8565 Japan
| | - Yuki Oba
- Interdisciplinary Research Center for Catalytic Chemistry (IRC3); National Institute of Advanced Industrial Science and Technology (AIST); Tsukuba Central 5 1-1-1 Higashi Tsukuba Ibaraki 305-8565 Japan
| | - Yumiko Nakajima
- Interdisciplinary Research Center for Catalytic Chemistry (IRC3); National Institute of Advanced Industrial Science and Technology (AIST); Tsukuba Central 5 1-1-1 Higashi Tsukuba Ibaraki 305-8565 Japan
| | - Shigeru Shimada
- Interdisciplinary Research Center for Catalytic Chemistry (IRC3); National Institute of Advanced Industrial Science and Technology (AIST); Tsukuba Central 5 1-1-1 Higashi Tsukuba Ibaraki 305-8565 Japan
| | - Kazuhiko Sato
- Interdisciplinary Research Center for Catalytic Chemistry (IRC3); National Institute of Advanced Industrial Science and Technology (AIST); Tsukuba Central 5 1-1-1 Higashi Tsukuba Ibaraki 305-8565 Japan
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9
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Yoshikawa M, Tamura Y, Wakabayashi R, Tamai M, Shimojima A, Kuroda K. Protecting and Leaving Functions of Trimethylsilyl Groups in Trimethylsilylated Silicates for the Synthesis of Alkoxysiloxane Oligomers. Angew Chem Int Ed Engl 2017; 56:13990-13994. [PMID: 28895273 DOI: 10.1002/anie.201705942] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/11/2017] [Indexed: 11/10/2022]
Abstract
The concept of protecting groups and leaving groups in organic synthesis was applied to the synthesis of siloxane-based molecules. Alkoxy-functionalized siloxane oligomers composed of SiO4 , RSiO3 , or R2 SiO2 units were chosen as targets (R: functional groups, such as Me and Ph). Herein we describe a novel synthesis of alkoxysiloxane oligomers based on the substitution reaction of trimethylsilyl (TMS) groups with alkoxysilyl groups. Oligosiloxanes possessing TMS groups were reacted with alkoxychlorosilane in the presence of BiCl3 as a catalyst. TMS groups were substituted with alkoxysilyl groups, leading to the synthesis of alkoxysiloxane oligomers. Siloxane oligomers composed of RSiO3 and R2 SiO2 units were synthesized more efficiently than those composed of SiO4 units, suggesting that the steric hindrance around the TMS groups of the oligosiloxanes makes a difference in the degree of substitution. This reaction uses TMS groups as both protecting and leaving groups for SiOH/SiO- groups.
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Affiliation(s)
- Masashi Yoshikawa
- Department of Applied Chemistry, Faculty of Science and Engineering, Waseda University, 3-4-1 Ohkubo, Shinjuku-ku, Tokyo, 169-8555, Japan
| | - Yasuhiro Tamura
- Department of Applied Chemistry, Faculty of Science and Engineering, Waseda University, 3-4-1 Ohkubo, Shinjuku-ku, Tokyo, 169-8555, Japan
| | - Ryutaro Wakabayashi
- Department of Applied Chemistry, Faculty of Science and Engineering, Waseda University, 3-4-1 Ohkubo, Shinjuku-ku, Tokyo, 169-8555, Japan.,Kagami Memorial Research Institute for Materials Science and Technology, Waseda University, 2-8-26 Nishiwaseda, Shinjuku-ku, Tokyo, 169-0051, Japan
| | - Misa Tamai
- Department of Applied Chemistry, Faculty of Science and Engineering, Waseda University, 3-4-1 Ohkubo, Shinjuku-ku, Tokyo, 169-8555, Japan
| | - Atsushi Shimojima
- Department of Applied Chemistry, Faculty of Science and Engineering, Waseda University, 3-4-1 Ohkubo, Shinjuku-ku, Tokyo, 169-8555, Japan
| | - Kazuyuki Kuroda
- Department of Applied Chemistry, Faculty of Science and Engineering, Waseda University, 3-4-1 Ohkubo, Shinjuku-ku, Tokyo, 169-8555, Japan.,Kagami Memorial Research Institute for Materials Science and Technology, Waseda University, 2-8-26 Nishiwaseda, Shinjuku-ku, Tokyo, 169-0051, Japan
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10
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Yoshikawa M, Tamura Y, Wakabayashi R, Tamai M, Shimojima A, Kuroda K. Protecting and Leaving Functions of Trimethylsilyl Groups in Trimethylsilylated Silicates for the Synthesis of Alkoxysiloxane Oligomers. Angew Chem Int Ed Engl 2017. [DOI: 10.1002/ange.201705942] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
Affiliation(s)
- Masashi Yoshikawa
- Department of Applied Chemistry; Faculty of Science and Engineering; Waseda University; 3-4-1 Ohkubo Shinjuku-ku Tokyo 169-8555 Japan
| | - Yasuhiro Tamura
- Department of Applied Chemistry; Faculty of Science and Engineering; Waseda University; 3-4-1 Ohkubo Shinjuku-ku Tokyo 169-8555 Japan
| | - Ryutaro Wakabayashi
- Department of Applied Chemistry; Faculty of Science and Engineering; Waseda University; 3-4-1 Ohkubo Shinjuku-ku Tokyo 169-8555 Japan
- Kagami Memorial Research Institute for Materials Science and Technology; Waseda University; 2-8-26 Nishiwaseda Shinjuku-ku Tokyo 169-0051 Japan
| | - Misa Tamai
- Department of Applied Chemistry; Faculty of Science and Engineering; Waseda University; 3-4-1 Ohkubo Shinjuku-ku Tokyo 169-8555 Japan
| | - Atsushi Shimojima
- Department of Applied Chemistry; Faculty of Science and Engineering; Waseda University; 3-4-1 Ohkubo Shinjuku-ku Tokyo 169-8555 Japan
| | - Kazuyuki Kuroda
- Department of Applied Chemistry; Faculty of Science and Engineering; Waseda University; 3-4-1 Ohkubo Shinjuku-ku Tokyo 169-8555 Japan
- Kagami Memorial Research Institute for Materials Science and Technology; Waseda University; 2-8-26 Nishiwaseda Shinjuku-ku Tokyo 169-0051 Japan
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11
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Matsumoto K, Sajna KV, Satoh Y, Sato K, Shimada S. By-Product-Free Siloxane-Bond Formation and Programmed One-Pot Oligosiloxane Synthesis. Angew Chem Int Ed Engl 2017. [DOI: 10.1002/ange.201611623] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
Affiliation(s)
- Kazuhiro Matsumoto
- Interdisciplinary Research Center for Catalytic Chemistry (IRC3); National Institute of Advanced Industrial Science and Technology (AIST); Tsukuba Central 5, 1-1-1 Higashi, Tsukuba Ibaraki 305-8565 Japan
| | - Kappam Veettil Sajna
- Interdisciplinary Research Center for Catalytic Chemistry (IRC3); National Institute of Advanced Industrial Science and Technology (AIST); Tsukuba Central 5, 1-1-1 Higashi, Tsukuba Ibaraki 305-8565 Japan
| | - Yasushi Satoh
- Interdisciplinary Research Center for Catalytic Chemistry (IRC3); National Institute of Advanced Industrial Science and Technology (AIST); Tsukuba Central 5, 1-1-1 Higashi, Tsukuba Ibaraki 305-8565 Japan
| | - Kazuhiko Sato
- Interdisciplinary Research Center for Catalytic Chemistry (IRC3); National Institute of Advanced Industrial Science and Technology (AIST); Tsukuba Central 5, 1-1-1 Higashi, Tsukuba Ibaraki 305-8565 Japan
| | - Shigeru Shimada
- Interdisciplinary Research Center for Catalytic Chemistry (IRC3); National Institute of Advanced Industrial Science and Technology (AIST); Tsukuba Central 5, 1-1-1 Higashi, Tsukuba Ibaraki 305-8565 Japan
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12
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Matsumoto K, Sajna KV, Satoh Y, Sato K, Shimada S. By-Product-Free Siloxane-Bond Formation and Programmed One-Pot Oligosiloxane Synthesis. Angew Chem Int Ed Engl 2017; 56:3168-3171. [DOI: 10.1002/anie.201611623] [Citation(s) in RCA: 30] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/29/2016] [Indexed: 11/09/2022]
Affiliation(s)
- Kazuhiro Matsumoto
- Interdisciplinary Research Center for Catalytic Chemistry (IRC3); National Institute of Advanced Industrial Science and Technology (AIST); Tsukuba Central 5, 1-1-1 Higashi, Tsukuba Ibaraki 305-8565 Japan
| | - Kappam Veettil Sajna
- Interdisciplinary Research Center for Catalytic Chemistry (IRC3); National Institute of Advanced Industrial Science and Technology (AIST); Tsukuba Central 5, 1-1-1 Higashi, Tsukuba Ibaraki 305-8565 Japan
| | - Yasushi Satoh
- Interdisciplinary Research Center for Catalytic Chemistry (IRC3); National Institute of Advanced Industrial Science and Technology (AIST); Tsukuba Central 5, 1-1-1 Higashi, Tsukuba Ibaraki 305-8565 Japan
| | - Kazuhiko Sato
- Interdisciplinary Research Center for Catalytic Chemistry (IRC3); National Institute of Advanced Industrial Science and Technology (AIST); Tsukuba Central 5, 1-1-1 Higashi, Tsukuba Ibaraki 305-8565 Japan
| | - Shigeru Shimada
- Interdisciplinary Research Center for Catalytic Chemistry (IRC3); National Institute of Advanced Industrial Science and Technology (AIST); Tsukuba Central 5, 1-1-1 Higashi, Tsukuba Ibaraki 305-8565 Japan
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13
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Komata Y, Yoshikawa M, Tamura Y, Wada H, Shimojima A, Kuroda K. Selective Formation of Alkoxychlorosilanes and Organotrialkoxysilane with Four Different Substituents by Intermolecular Exchange Reaction. Chem Asian J 2016; 11:3225-3233. [PMID: 27661779 DOI: 10.1002/asia.201601120] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/11/2016] [Revised: 09/05/2016] [Indexed: 11/12/2022]
Abstract
Alkoxychlorosilanes are scientifically and industrially important toward preparing silicone and silica as well as preparation of siloxane-based nanomaterials by stepwise reactions of Si-OR (R=alkyl) and Si-Cl groups. Intermolecular exchange of alkoxy and chloro groups between alkoxysilanes and chlorosilanes (functional group exchange reaction) provides an efficient and environmentally benign route to alkoxychlorosilanes. BiCl3 as a Lewis acid catalyst can promote the functional group exchange reactions more efficiently than conventional acid catalysts. Higher reactivity has been observed for chlorosilanes with smaller numbers of Si-CH3 groups and for alkoxysilanes with larger numbers of Si-CH3 groups. The reaction mechanism is proposed and selective syntheses of alkoxychlorosilanes are demonstrated. These findings also enable us to synthesize an organotrialkoxysilane with four different substituents.
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Affiliation(s)
- Yuma Komata
- Department of Applied Chemistry, Faculty of Science and Engineering, Waseda University, 3-4-1 Ohkubo, Shinjuku-ku, Tokyo, 169-8555, Japan
| | - Masashi Yoshikawa
- Department of Applied Chemistry, Faculty of Science and Engineering, Waseda University, 3-4-1 Ohkubo, Shinjuku-ku, Tokyo, 169-8555, Japan
| | - Yasuhiro Tamura
- Department of Applied Chemistry, Faculty of Science and Engineering, Waseda University, 3-4-1 Ohkubo, Shinjuku-ku, Tokyo, 169-8555, Japan
| | - Hiroaki Wada
- Department of Applied Chemistry, Faculty of Science and Engineering, Waseda University, 3-4-1 Ohkubo, Shinjuku-ku, Tokyo, 169-8555, Japan
| | - Atsushi Shimojima
- Department of Applied Chemistry, Faculty of Science and Engineering, Waseda University, 3-4-1 Ohkubo, Shinjuku-ku, Tokyo, 169-8555, Japan
| | - Kazuyuki Kuroda
- Department of Applied Chemistry, Faculty of Science and Engineering, Waseda University, 3-4-1 Ohkubo, Shinjuku-ku, Tokyo, 169-8555, Japan.,Kagami Memorial Research Institute for Materials Science and Technology, Waseda University, 2-8-26 Nishiwaseda, Shinjuku-ku, Tokyo, 169-0051, Japan
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14
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Neumeyer F, Auner N. One-Step Synthesis of Siloxanes from the Direct Process Disilane Residue. Chemistry 2016; 22:17165-17168. [PMID: 27739108 DOI: 10.1002/chem.201603842] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/11/2016] [Indexed: 11/08/2022]
Abstract
The well-established Müller-Rochow Direct Process for the chloromethylsilane synthesis produces a disilane residue (DPR) consisting of compounds Men Si2 Cl6-n (n=1-6) in thousands of tons annually. Technologically, much effort is made to retransfer the disilanes into monosilanes suitable for introduction into the siloxane production chain for increase in economic value. Here, we report on a single step reaction to directly form cyclic, linear, and cage-like siloxanes upon treatment of the DPR with a 5 m HCl in Et2 O solution at about 120 °C for 60 h. For simplification of the Si-Si bond cleavage and aiming on product selectivity the grade of methylation at the silicon backbone is increased to n≥4. Moreover, the HCl/Et2 O reagent is also suitable to produce siloxanes from the corresponding monosilanes under comparable conditions.
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Affiliation(s)
- Felix Neumeyer
- Institut für Anorganische Chemie, Goethe-Universität, Max-von-Laue-Straße 7, 60438, Frankfurt/Main, Germany
| | - Norbert Auner
- Institut für Anorganische Chemie, Goethe-Universität, Max-von-Laue-Straße 7, 60438, Frankfurt/Main, Germany
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15
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Saito S, Yamasue N, Wada H, Shimojima A, Kuroda K. Cubic Siloxanes with Both Si-H and Si-OtBu Groups for Site-Selective Siloxane Bond Formation. Chemistry 2016; 22:13857-13864. [PMID: 27535611 DOI: 10.1002/chem.201601906] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/23/2016] [Indexed: 11/11/2022]
Abstract
Cage-type siloxanes have attracted increasing attention as building blocks for silica-based nanomaterials as their corners can be modified with various functional groups. Cubic octasiloxanes incorporating both Si-H and Si-OtBu groups [(tBuO)n H8-n Si8 O12 ; n=1, 2 or 7] have been synthesized by the reaction of octa(hydridosilsesquioxane) (H8 Si8 O12 ) and tert-butyl alcohol in the presence of a Et2 NOH catalyst. The Si-H and Si-OtBu groups are useful for site-selective formation of Si-O-Si linkages without cage structure deterioration. The Si-H group can be selectively hydrolyzed to form a Si-OH group in the presence of Et2 NOH, enabling the formation of the monosilanol compound (tBuO)7 (HO)Si8 O12 . The Si-OH group can be used for either intermolecular condensation to form a dimeric cage compound or silylation to introduce new reaction sites. Additionally, the alkoxy groups of (tBuO)7 HSi8 O12 can be treated with organochlorosilanes in the presence of a BiCl3 catalyst to form Si-O-Si linkages, while the Si-H group remains intact. These results indicate that such bifunctional cage siloxanes allow for stepwise Si-O-Si bond formation to design new siloxane-based nanomaterials.
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Affiliation(s)
- Shohei Saito
- Department of Applied Chemistry, Faculty of Science and Engineering, Waseda University, Okubo-3, Shinjuku-ku, Tokyo, 169-8555, Japan
| | - Nao Yamasue
- Department of Applied Chemistry, Faculty of Science and Engineering, Waseda University, Okubo-3, Shinjuku-ku, Tokyo, 169-8555, Japan
| | - Hiroaki Wada
- Department of Applied Chemistry, Faculty of Science and Engineering, Waseda University, Okubo-3, Shinjuku-ku, Tokyo, 169-8555, Japan
| | - Atsushi Shimojima
- Department of Applied Chemistry, Faculty of Science and Engineering, Waseda University, Okubo-3, Shinjuku-ku, Tokyo, 169-8555, Japan.
| | - Kazuyuki Kuroda
- Department of Applied Chemistry, Faculty of Science and Engineering, Waseda University, Okubo-3, Shinjuku-ku, Tokyo, 169-8555, Japan. .,Kagami Memorial Research Institute for Materials Science and Technology, Nishiwaseda-2, Shinjuku-ku, Tokyo, 169-0051, Japan.
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16
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Bauer JO, Strohmann C. Recent Progress in Asymmetric Synthesis and Application of Difunctionalized Silicon-Stereogenic Silanes. Eur J Inorg Chem 2016. [DOI: 10.1002/ejic.201600100] [Citation(s) in RCA: 85] [Impact Index Per Article: 10.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/08/2023]
Affiliation(s)
- Jonathan O. Bauer
- Anorganische Chemie; Technische Universität Dortmund; Otto-Hahn-Straße 6 44227 Dortmund Germany
- Department of Organic Chemistry; The Weizmann Institute of Science; P. O. Box 26 76100 Rehovot Israel
| | - Carsten Strohmann
- Anorganische Chemie; Technische Universität Dortmund; Otto-Hahn-Straße 6 44227 Dortmund Germany
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17
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Bauer JO, Strohmann C. Stereoselektive Synthese siliciumstereogener Aminomethoxysilane: ein einfacher Zugang zu hoch enantiomerenangereicherten Siloxanen. Angew Chem Int Ed Engl 2013. [DOI: 10.1002/ange.201307826] [Citation(s) in RCA: 23] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/24/2022]
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18
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Bauer JO, Strohmann C. Stereoselective Synthesis of Silicon-Stereogenic Aminomethoxysilanes: Easy Access to Highly Enantiomerically Enriched Siloxanes. Angew Chem Int Ed Engl 2013; 53:720-4. [DOI: 10.1002/anie.201307826] [Citation(s) in RCA: 47] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/05/2013] [Indexed: 11/12/2022]
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19
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Wakabayashi R, Kuroda K. Siloxane-Bond Formation Promoted by Lewis Acids: A Nonhydrolytic Sol-Gel Process and the Piers-Rubinsztajn Reaction. Chempluschem 2013; 78:764-774. [PMID: 31986688 DOI: 10.1002/cplu.201300027] [Citation(s) in RCA: 28] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/26/2013] [Revised: 05/09/2013] [Indexed: 11/06/2022]
Abstract
Siloxane formation reactions of both the nonhydrolytic sol-gel process and Piers-Rubinsztajn reaction can be integrated as Lewis acid promoted siloxane syntheses without involving silanol groups. The former was developed in the field of inorganic materials chemistry and the latter was initiated in polymer chemistry. We have realized both reactions are quite similar, in terms of 1) the nonhydrolytic reaction, 2) the use of alkoxysilanes, 3) the group-exchange reactions competing with the siloxane formation, and 4) the proposed reaction mechanisms. This Minireview focuses on the above two reactions. The evolution of both reactions should realize a more sophisticated molecular design of siloxane compounds, which surely contributes to the development of advanced functional materials.
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Affiliation(s)
- Ryutaro Wakabayashi
- Department of Applied Chemistry, Waseda University, Ohkubo-3, Shinjuku-ku, Tokyo 169-8555 (Japan), Fax: (+81) 3-5286-3199 http://www.waseda.jp/sem-kuroda_lab/.,Kagami Memorial Research Institute for Materials, Science and Technology, Waseda University, Nishiwaseda-2, Shinjuku-ku, Tokyo 169-0051 (Japan).,Research Fellow Laboratories Yokkaichi, JSR Corporation, 100 Kawajiri-cho, Yokkaichi, Mie 510-8552 (Japan)
| | - Kazuyuki Kuroda
- Department of Applied Chemistry, Waseda University, Ohkubo-3, Shinjuku-ku, Tokyo 169-8555 (Japan), Fax: (+81) 3-5286-3199 http://www.waseda.jp/sem-kuroda_lab/.,Kagami Memorial Research Institute for Materials, Science and Technology, Waseda University, Nishiwaseda-2, Shinjuku-ku, Tokyo 169-0051 (Japan)
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Wakabayashi R, Sugiura Y, Shibue T, Kuroda K. Practical Conversion of Chlorosilanes into Alkoxysilanes without Generating HCl. Angew Chem Int Ed Engl 2011. [DOI: 10.1002/ange.201104948] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
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Wakabayashi R, Sugiura Y, Shibue T, Kuroda K. Practical Conversion of Chlorosilanes into Alkoxysilanes without Generating HCl. Angew Chem Int Ed Engl 2011; 50:10708-11. [DOI: 10.1002/anie.201104948] [Citation(s) in RCA: 33] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/15/2011] [Indexed: 11/08/2022]
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