Chemistry:Ketenyl anion
A ketenyl anion contains a C=C=O allene-like functional group, similar to ketene, with a negative charge on either terminal carbon or oxygen atom, forming resonance structures by moving a lone pair of electrons on C-C-O bond. Ketenes have been sources for many organic compounds with its reactivity despite a challenge to isolate them as crystal. Precedent method to obtain this product has been at gas phase or at reactive intermediate, and synthesis of ketene is used be done in extreme conditions (i.e., high temperature, low pressure).[1][2][3] Recently found stabilized ketenyl anions become easier to prepare compared to precedent synthetic procedure. A major feature about stabilized ketene is that it can be prepared from carbon monoxide (CO) reacting with main-group starting materials such as ylides, silylene, and phosphinidene to synthesize and isolate for further steps. As CO becomes a more common carbon source for various type of synthesis,[4] this recent finding about stabilizing ketene with main-group elements opens a variety of synthetic routes to target desired products.
Synthesis
Gessner et al. first revealed a synthetic route for stabilized ketenyl anion using metalated ylides in 2022.[5] In their paper, upon introducing CO, metalated ylide with posassium cation exchange CO with phosphine group R, also known for carbonylation of ylide. Their isolated ketenyl anion [K(PPh2(=S)CCO] is stable solid for a week under inert atmosphere, and its crystal structure was characterized. An alternate synthetic pathway for synthesizing ketenyl anion from ylide, shown in Figure 2, includes sulfuration on diphenylphosphine group, deprotonation on carbon center, and CO substitution in exchange of triphenylphosphine leaving. This synthesis resulted in 88% isolation of the product. Later in their studies, the ketenyl anion product upon carbonylation can be selective by changing electron-withdrawing ability on a certain leaving group and Lewis acidity of coordinated alkali metal cation.[6] In their example with ylide containing phosphine group and tosyl group (Ts), Gessner et al. was able to produce the ketenyl anion product more selective by modifying those parameters, shown in Figure 2. As R group is more electron-withdrawing group, it becomes more likely to leave than tosyl group. For example, changing R group from cyclohexyl group (Cy) to phenyl group (Ph) favored the ketenyl anion product with R1 group leaving by 76%. This is because phenyl group is less electron rich and less nucleophilic compared to cyclohexyl group, resulting in more stable by itself.[7] For alkali metal cation trend, when triphenylphosphine group is present, changing from M = Li to M = K favored in phosphine group leaving by 9%. Although it is a small effect compared to leaving group effect, this is due to Lewis acidity[8] on metal cations because a stronger Lewis acidic metal cation (Li > K in Lewis acidity) attracts tosyl group to interact, resulting in increasing leaving group ability.
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Inoue et al. presented synthetic route of stabilizing ketene via silica-carbonyl anion, silicon analogue of ketene.[9] They motivated this goals from recent reactivity study of silylene and disilane activating CO and isolating intermediate, hypothesizing that silica-ketenyl anion is also capable to stabilize ketene.[10][11][12] While Gessner et al. uses ylides to accept CO, Inoue et al. uses silylene anion with another silyl group substituted to afford insertion of CO or carbonylation at room temperature in exchange of silyl group.
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Liu et al. had another approach to stabilize and isolate ketene by using carbene coordinated by phosphinidene.[13] Carbene coordinated by 2,6-diisopropylphenyl(Dipp)-substituted phosphinidene and dinitrogen (N2) perform N2/CO ligand exchange. The starting material is similar to N-heterocyclic carbene with bulky substituents, invented by Bertrand.[14] In their studies, this reaction is concerted and thermodynamically favorable (-47.4 kcal/mol relative to N2-coordinated carbene) on coordinating CO ligand to NHC. This product is stable at room temperature inert atmosphere for a month, and no decomposition while heating in THF at 80 °C for 12 hours was observed.
Structure
As shown in Figure 5, ketenyl anion has two major resonance structures: ketenyl form and ynolate form. Due to the resonance structures, alkali metal cations can be coordinated to either at central carbon atom or terminal oxygen atom depending on its electronic structure.[5][6] A series of structural analysis revealed both ketene and ynolate structures evenly contribute to the overall electronic structure of ketenyl anion.
From an example in Gessner's paper, the crystal structure of the ketenyl anion K[PPh2(=S)CCO] had the bond length of C-C bond (1.245 Å) and C-O bond (1.215 Å).[5] By comparing these bond length with Pyykkő's analysis on bond,[15] C-C bond is in between double bond and triple bond whereas C-O bond is in between single bond and double bond. In natural bond orbital (NBO) analysis,[16][17] Wiberg bond index is found to be 2.06 and 1.72 for C-C bond and C-O bond, respectively. These values also suggests that both double and triple bond character for C-C bond (range of 1.20 - 1.34 Å) and both single bond and double bond character for C-O bond (range of 1.24 - 1.38 Å). The characteristic of allene-like (C=C=C) structure is also applied other ketenyl anion compounds so far. Inoue's silica-ketenyl anion product, shown in Figure 3, had Wiberg bond index of 1.68 and 1.76 for Si-C bond and C-O bond, respectively.[9] Their bond indices demonstrate that both Si-C and C-O bonds have part of double bond character that contributes of Si=C=O structure.
This ketenyl anion can dimerize in solid state as oxygen atoms interacts with alkali metal cation. This dimer can be broken up by adding M(18-crown-6) (where M = alkali metal cation), resulting in isolation of single ketenyl anion structure.[5][9] Intrinsic bond orbitals (IBO) of the molecule [K(PPh2(=S)CCO] reveal molecular orbital describing π-orbital of C-C and C-O and delocalized orbital on oxygen atom.
The stability of ketenyl anion is come from the decrease of charge on ketene carbon from parent ketene to ketenyl anion. In Gessner's study, parent ketenyl anion [H-C=C=O]- has smaller positive charge (+4.0 e) on C compared to parent ketene [H2C=C=O] (+7.0 e on C).[5] This drops of charge makes the ketene less amphiphilic, leading to a more stable compound.
Reactivity
The advantage of using ketenyl anion molecule is to synthesize desired compound selectively without concerning dimerization before synthesizing a target product.[21] In ylide-ketenyl anion, electrophile can be substituted in exchange of metal to functionalize the ketene moiety at high yield.[5] Since the central carbon is negatively charged, this nucleophilicity enable substitution with a series of electrophilic compounds such as triphenylmethyl group. Some ketenyl anion can further react with other compounds to form a new functional group. For example, after electrophilic substitution of ketenyl anion with triphenylmethyl group, the treatment with water results in formation of carboxylic acid at C=O moiety. Reported compounds from Gessner et al. had more than 90% yield isolated as solid.
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Not only at the central carbon where a cation can be coordinated, other carbon atom and terminal oxygen atom can also be functionalized upon electrophilic substitution. This reactivity allows activation of chemical bonds such as S-S and C=O bonds and new bonds C-S bond and C=C bond.[5] These products requires CO and substrates of interests, which highlight new synthetic pathways of organic compounds at room temperature instead of extreme conditions such as pyrolysis.[2]
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A stabilized ketenyl anion also undergoes dimerization with disubstituted phosphine compound to form a heterocyclic product.[5] In this reaction, an intermediate is proposed to be electrophilic substitution of a disubstituted phosphine compound followed by dimerization.
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In different ketenyl anion compound, cleavage of Csp-H bond, C=N bond, and I2 bond at room temperature were also reported in phosphinidene-stabilized ketene.[13] For I2 cleaving reaction, the mechanism is proposed to be cleavage of the bond at central carbon and migration of I to phosphorus atom.
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References
- ↑ Robinson, Marin S.; Davico, Gustavo E.; Bierbaum, Veronica M.; DePuy, Charles H. (1994-10-06). "The gas phase ion/molecule chemistry of the carbon- 13 labeled ketenyl and methyl ketenyl anions with CS2, COS, and CO2". International Journal of Mass Spectrometry and Ion Processes 137: 107–119. doi:10.1016/0168-1176(94)04030-3. ISSN 0168-1176. https://dx.doi.org/10.1016/0168-1176%2894%2904030-3.
- ↑ 2.0 2.1 Allen, Annette D.; Tidwell, Thomas T. (2013-09-11). "Ketenes and Other Cumulenes as Reactive Intermediates" (in en). Chemical Reviews 113 (9): 7287–7342. doi:10.1021/cr3005263. ISSN 0009-2665. PMID 23767795. https://pubs.acs.org/doi/10.1021/cr3005263.
- ↑ Woodbury, Richard P.; Long, Nathan R.; Rathke, Michael W. (January 1978). "Reaction of trimethylsilylketene with strong base. Evidence for ketene enolate formation" (in en). The Journal of Organic Chemistry 43 (2): 376. doi:10.1021/jo00396a057. ISSN 0022-3263. https://pubs.acs.org/doi/abs/10.1021/jo00396a057.
- ↑ Fujimori, Shiori; Inoue, Shigeyoshi (2022-02-09). "Carbon Monoxide in Main-Group Chemistry" (in en). Journal of the American Chemical Society 144 (5): 2034–2050. doi:10.1021/jacs.1c13152. ISSN 0002-7863. PMID 35068141. https://pubs.acs.org/doi/10.1021/jacs.1c13152.
- ↑ 5.00 5.01 5.02 5.03 5.04 5.05 5.06 5.07 5.08 5.09 5.10 5.11 5.12 Jörges, Mike; Krischer, Felix; Gessner, Viktoria H. (2022-12-23). "Transition metal–free ketene formation from carbon monoxide through isolable ketenyl anions" (in en). Science 378 (6626): 1331–1336. doi:10.1126/science.ade4563. ISSN 0036-8075. https://www.science.org/doi/10.1126/science.ade4563.
- ↑ 6.0 6.1 6.2 Krischer, Felix; Jörges, Mike; Leung, Tsz‐Fai; Darmandeh, Heidar; Gessner, Viktoria H. (2023-10-09). "Selectivity Control of the Ligand Exchange at Carbon in α‐Metallated Ylides as a Route to Ketenyl Anions**" (in en). Angewandte Chemie International Edition 62 (41). doi:10.1002/anie.202309629. ISSN 1433-7851. https://onlinelibrary.wiley.com/doi/10.1002/anie.202309629.
- ↑ "Leaving Groups" (in en). 2013-10-02. https://chem.libretexts.org/Bookshelves/Organic_Chemistry/Supplemental_Modules_(Organic_Chemistry)/Reactions/Substitution_Reactions/SN2/Leaving_Groups.
- ↑ "3.2: Brønsted and Lewis Acids and Bases" (in en). 2019-09-04. https://chem.libretexts.org/Bookshelves/Inorganic_Chemistry/Book%3A_Introduction_to_Inorganic_Chemistry_(Wikibook)/03%3A_Acid-Base_Chemistry/3.02%3A_Brnsted_and_Lewis_Acids_and_Bases.
- ↑ 9.0 9.1 9.2 9.3 Fujimori, Shiori; Kostenko, Arseni; Scopelliti, Rosario; Inoue, Shigeyoshi (July 2023). "Synthesis, isolation and application of a sila-ketenyl anion" (in en). Nature Synthesis 2 (7): 688–694. doi:10.1038/s44160-023-00283-w. ISSN 2731-0582. https://www.nature.com/articles/s44160-023-00283-w.
- ↑ Wang, Yuwen; Kostenko, Arseni; Hadlington, Terrance J.; Luecke, Marcel-Philip; Yao, Shenglai; Driess, Matthias (2019-01-09). "Silicon-Mediated Selective Homo- and Heterocoupling of Carbon Monoxide" (in en). Journal of the American Chemical Society 141 (1): 626–634. doi:10.1021/jacs.8b11899. ISSN 0002-7863. https://pubs.acs.org/doi/10.1021/jacs.8b11899.
- ↑ Xiong, Yun; Yao, Shenglai; Szilvási, Tibor; Ruzicka, Ales; Driess, Matthias (2020-01-16). "Homocoupling of CO and isocyanide mediated by a C,C′-bis(silylenyl)-substituted ortho-carborane" (in en). Chemical Communications 56 (5): 747–750. doi:10.1039/C9CC08680C. ISSN 1364-548X. https://pubs.rsc.org/en/content/articlelanding/2020/cc/c9cc08680c.
- ↑ Cowley, Michael J.; Ohmori, Yu; Huch, Volker; Ichinohe, Masaaki; Sekiguchi, Akira; Scheschkewitz, David (2013-12-09). "Carbonylation of Cyclotrisilenes" (in en). Angewandte Chemie International Edition 52 (50): 13247–13250. doi:10.1002/anie.201307450. ISSN 1433-7851. PMID 24307015. https://onlinelibrary.wiley.com/doi/10.1002/anie.201307450.
- ↑ 13.0 13.1 13.2 13.3 Wei, Rui; Wang, Xin‐Feng; Ruiz, David A.; Liu, Liu Leo (2023-04-03). "Stable Ketenyl Anions via Ligand Exchange at an Anionic Carbon as Powerful Synthons**" (in en). Angewandte Chemie International Edition 62 (15): e202219211. doi:10.1002/anie.202219211. ISSN 1433-7851. PMID 36807666. https://onlinelibrary.wiley.com/doi/10.1002/anie.202219211.
- ↑ Lavallo, Vincent; Dyker, C. Adam; Donnadieu, Bruno; Bertrand, Guy (2008-07-07). "Synthesis and Ligand Properties of Stable Five‐Membered‐Ring Allenes Containing Only Second‐Row Elements" (in en). Angewandte Chemie International Edition 47 (29): 5411–5414. doi:10.1002/anie.200801176. ISSN 1433-7851. PMID 18551494. https://onlinelibrary.wiley.com/doi/10.1002/anie.200801176.
- ↑ Pyykkö, Pekka; Atsumi, Michiko (2009-11-23). "Molecular Double‐Bond Covalent Radii for Elements Li–E112" (in en). Chemistry – A European Journal 15 (46): 12770–12779. doi:10.1002/chem.200901472. ISSN 0947-6539. PMID 19856342. https://chemistry-europe.onlinelibrary.wiley.com/doi/10.1002/chem.200901472.
- ↑ Glendening, Eric D.; Landis, Clark R.; Weinhold, Frank (January 2012). "Natural bond orbital methods" (in en). WIREs Computational Molecular Science 2 (1): 1–42. doi:10.1002/wcms.51. ISSN 1759-0876. https://wires.onlinelibrary.wiley.com/doi/10.1002/wcms.51.
- ↑ Bridgeman, Adam J.; Cavigliasso, Germán; Ireland, Luke R.; Rothery, Joanne (2001-01-01). "The Mayer bond order as a tool in inorganic chemistry" (in en). Journal of the Chemical Society, Dalton Transactions (14): 2095–2108. doi:10.1039/B102094N. ISSN 1364-5447. https://pubs.rsc.org/en/content/articlelanding/2001/dt/b102094n.
- ↑ Knizia, Gerald (2013-11-12). "Intrinsic Atomic Orbitals: An Unbiased Bridge between Quantum Theory and Chemical Concepts" (in en). Journal of Chemical Theory and Computation 9 (11): 4834–4843. doi:10.1021/ct400687b. ISSN 1549-9618. PMID 26583402. https://pubs.acs.org/doi/10.1021/ct400687b.
- ↑ Knizia, Gerald; Klein, Johannes E. M. N. (2015-04-27). "Electron Flow in Reaction Mechanisms—Revealed from First Principles" (in en). Angewandte Chemie International Edition 54 (18): 5518–5522. doi:10.1002/anie.201410637. ISSN 1433-7851. PMID 25737294. https://onlinelibrary.wiley.com/doi/10.1002/anie.201410637.
- ↑ "r2SCAN-3c: A "Swiss army knife" composite electronic-structure method". https://pubs.aip.org/aip/jcp/article/154/6/064103/199831/r2SCAN-3c-A-Swiss-army-knife-composite-electronic.
- ↑ Huisgen, Rolf; Otto, Peter (September 1968). "The mechanism of dimerization of dimethylketene" (in en). Journal of the American Chemical Society 90 (19): 5342–5343. doi:10.1021/ja01021a090. ISSN 0002-7863. https://pubs.acs.org/doi/abs/10.1021/ja01021a090.
![]() | Original source: https://en.wikipedia.org/wiki/Ketenyl anion.
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