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Bischof T, Wieprecht N, Fuchs S, Endres L, Krummenacher I, Michel M, Mihm C, Braunschweig H, Finze M. Unlocking Heteroaromatic Ring Systems through Chalcogen Insertion into Boroles. Inorg Chem 2023; 62:21329-21335. [PMID: 38048693 DOI: 10.1021/acs.inorgchem.3c03403] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/06/2023]
Abstract
In this work, we report the reactivity of various annulated borole derivatives toward chalcogen (O, S, and Se) insertion. Among a series of 9-borafluorenes with different boron substituents (Ph, Br, or o-carboranyl) and a mixed thiophene-benzene-fused derivative, only the 9-o-carboranyl-substituted 9-borafluorene yielded the complete set of chalcogen-containing heteroarenes, including the first 1,2-selenaborinine derivative. To evaluate the aromaticity of this heterocyclic analogue of phenanthrene, nucleus-independent chemical shift (NICS) values were computed and compared to those of its lighter group 16 congeners.
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Affiliation(s)
- Tobias Bischof
- Institute for Inorganic Chemistry, Julius-Maximilians-Universität Würzburg, Am Hubland, 97074 Würzburg, Germany
- Institute for Sustainable Chemistry & Catalysis with Boron, Julius-Maximilians-Universität Würzburg, Am Hubland, 97074 Würzburg, Germany
| | - Nele Wieprecht
- Institute for Inorganic Chemistry, Julius-Maximilians-Universität Würzburg, Am Hubland, 97074 Würzburg, Germany
- Institute for Sustainable Chemistry & Catalysis with Boron, Julius-Maximilians-Universität Würzburg, Am Hubland, 97074 Würzburg, Germany
| | - Sonja Fuchs
- Institute for Inorganic Chemistry, Julius-Maximilians-Universität Würzburg, Am Hubland, 97074 Würzburg, Germany
- Institute for Sustainable Chemistry & Catalysis with Boron, Julius-Maximilians-Universität Würzburg, Am Hubland, 97074 Würzburg, Germany
| | - Lukas Endres
- Institute for Inorganic Chemistry, Julius-Maximilians-Universität Würzburg, Am Hubland, 97074 Würzburg, Germany
- Institute for Sustainable Chemistry & Catalysis with Boron, Julius-Maximilians-Universität Würzburg, Am Hubland, 97074 Würzburg, Germany
| | - Ivo Krummenacher
- Institute for Inorganic Chemistry, Julius-Maximilians-Universität Würzburg, Am Hubland, 97074 Würzburg, Germany
- Institute for Sustainable Chemistry & Catalysis with Boron, Julius-Maximilians-Universität Würzburg, Am Hubland, 97074 Würzburg, Germany
| | - Maximilian Michel
- Institute for Inorganic Chemistry, Julius-Maximilians-Universität Würzburg, Am Hubland, 97074 Würzburg, Germany
- Institute for Sustainable Chemistry & Catalysis with Boron, Julius-Maximilians-Universität Würzburg, Am Hubland, 97074 Würzburg, Germany
| | - Cornelius Mihm
- Institute for Inorganic Chemistry, Julius-Maximilians-Universität Würzburg, Am Hubland, 97074 Würzburg, Germany
- Institute for Sustainable Chemistry & Catalysis with Boron, Julius-Maximilians-Universität Würzburg, Am Hubland, 97074 Würzburg, Germany
| | - Holger Braunschweig
- Institute for Inorganic Chemistry, Julius-Maximilians-Universität Würzburg, Am Hubland, 97074 Würzburg, Germany
- Institute for Sustainable Chemistry & Catalysis with Boron, Julius-Maximilians-Universität Würzburg, Am Hubland, 97074 Würzburg, Germany
| | - Maik Finze
- Institute for Inorganic Chemistry, Julius-Maximilians-Universität Würzburg, Am Hubland, 97074 Würzburg, Germany
- Institute for Sustainable Chemistry & Catalysis with Boron, Julius-Maximilians-Universität Würzburg, Am Hubland, 97074 Würzburg, Germany
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Škoch K, Daniliuc CG, Kehr G, Erker G. Substituent Dependent Cyclization Reactions of 1,1'‐Bis(alkynyl)ferrocenes with the (C
6
F
5
)BH
2
⋅ SMe
2
Hydroboration Reagent. Eur J Inorg Chem 2021. [DOI: 10.1002/ejic.202100838] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/19/2022]
Affiliation(s)
- Karel Škoch
- Organisch-Chemisches Institut Westfälische-Wilhelms Universität Münster Corrensstraβe 40 48149 Münster Germany
- Current address: Institute of Inorganic Chemistry of the Czech Academy of Sciences 250 68 Husinec-Řež Czech Republic
| | - Constantin G. Daniliuc
- Organisch-Chemisches Institut Westfälische-Wilhelms Universität Münster Corrensstraβe 40 48149 Münster Germany
| | - Gerald Kehr
- Organisch-Chemisches Institut Westfälische-Wilhelms Universität Münster Corrensstraβe 40 48149 Münster Germany
| | - Gerhard Erker
- Organisch-Chemisches Institut Westfälische-Wilhelms Universität Münster Corrensstraβe 40 48149 Münster Germany
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Schorr F, Fantuzzi F, Dewhurst RD, Braunschweig H. Dialkynyldiboranes(4) and the selectable reactivity of their C-H, C[triple bond, length as m-dash]C and B-B bonds. Chem Commun (Camb) 2021; 57:2645-2648. [PMID: 33587741 DOI: 10.1039/d1cc00265a] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/15/2023]
Abstract
The synthesis and reactivity of dialkynyldiboranes(4), a little-studied family of diboranes, are presented herein. Three dialkynyldiboranes(4) were prepared via two different salt metathesis pathways. The three reactive sites of these dialkynyldiboranes(4) are then selectively addressed by judicious application of reagents: addition of an amine N-oxide leads to oxygen insertion into the B-B bond, dicobaltoctacarbonyl binds to the alkynyl C[triple bond, length as m-dash]C bonds, while Sonogashira-Hagihara cross-coupling conditions lead to double C-C bond formation at the alkynyl C-H groups.
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Affiliation(s)
- Fabian Schorr
- Institute for Inorganic Chemistry, Julius-Maximilians-Universität Würzburg, Am Hubland, Würzburg 97074, Germany. and Institute for Sustainable Chemistry & Catalysis with Boron, Julius-Maximilians-Universität Würzburg, Am Hubland, Würzburg 97074, Germany
| | - Felipe Fantuzzi
- Institute for Inorganic Chemistry, Julius-Maximilians-Universität Würzburg, Am Hubland, Würzburg 97074, Germany. and Institute for Sustainable Chemistry & Catalysis with Boron, Julius-Maximilians-Universität Würzburg, Am Hubland, Würzburg 97074, Germany and Institute for Physical and Theoretical Chemistry, Julius-Maximilians-Universität Würzburg, Emil-Fischer-Str. 42, Würzburg 97074, Germany
| | - Rian D Dewhurst
- Institute for Inorganic Chemistry, Julius-Maximilians-Universität Würzburg, Am Hubland, Würzburg 97074, Germany. and Institute for Sustainable Chemistry & Catalysis with Boron, Julius-Maximilians-Universität Würzburg, Am Hubland, Würzburg 97074, Germany
| | - Holger Braunschweig
- Institute for Inorganic Chemistry, Julius-Maximilians-Universität Würzburg, Am Hubland, Würzburg 97074, Germany. and Institute for Sustainable Chemistry & Catalysis with Boron, Julius-Maximilians-Universität Würzburg, Am Hubland, Würzburg 97074, Germany
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Dey S, Sun W, Müller J. [n]Ferrocenophanes (n = 2, 3) with Nitrogen and Phosphorus in Bridging Positions. Inorg Chem 2016; 55:3630-9. [PMID: 26986956 DOI: 10.1021/acs.inorgchem.6b00170] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
The in situ prepared dilithio derivative of the known species 1-bromo-1'-(trimethylsilylamino)ferrocene (1) reacted with tBuPCl2 to form the first example of a [2]ferrocenophane ([2]FCP) bridged by nitrogen and phosphorus (2). Sulfurization of 2 followed by column chromatography on silica gel gave the expected [2]FCP with a tBu(S)PN(SiMe3) bridging moiety (3a) and its desilylated counterpart with a tBu(S)PNH bridging moiety (3b). The molecular structure of 3b was determined by single-crystal X-ray analysis (α = 18.40(11)°). Using a common synthetic methodology, two new 1-amino-1'-bromoferrocene derivatives were prepared, one species with a PhCH2 (6a) and another with a tBuCH2 group (6b) on nitrogen. Dilithiation of 6a followed by addition of tBuPCl2 gave a mixture of three constitutional isomers: the targeted [2]FCP (7a), the 1,1'-disubstituted ferrocene derivative (tBuPH)(PhCH═N)fc (8a), and the [3]FCP bridged by a (NH)(CHPh)PtBu moiety (9a). NMR spectroscopy revealed that 8a is the precursor for 9a. The salt-metathesis reaction of the dilithio derivative of 6b with tBuPCl2 exclusively gave the 1,1'-disubstituted ferrocene derivative (tBuPH)(tBuCH═N)fc (8b), which does not isomerize to the respective [3]FCP. DFT calculations at the M06/6-311+G(d,p) level were used to better rationalize these unexpected results.
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Affiliation(s)
- Subhayan Dey
- Department of Chemistry and ‡Saskatchewan Structural Sciences Centre, University of Saskatchewan , 110 Science Place, Saskatoon, Saskatchewan S7N 5C9, Canada
| | - Wei Sun
- Department of Chemistry and ‡Saskatchewan Structural Sciences Centre, University of Saskatchewan , 110 Science Place, Saskatoon, Saskatchewan S7N 5C9, Canada
| | - Jens Müller
- Department of Chemistry and ‡Saskatchewan Structural Sciences Centre, University of Saskatchewan , 110 Science Place, Saskatoon, Saskatchewan S7N 5C9, Canada
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Sanz X, Vogels CM, Decken A, Bo C, Westcott SA, Fernández E. Face to face activation of a phenylselenium borane with α,β-unsaturated carbonyl substrates: facile synthesis of C–Se bonds. Chem Commun (Camb) 2014; 50:8420-3. [DOI: 10.1039/c4cc02098g] [Citation(s) in RCA: 22] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/28/2022]
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Abstract
The ferrocenylboranes (BOhfip2)Fc and 1,1'-(BOhfip2)2Fc were prepared (Fc = ferrocenyl, Ohfip = (CF3)2CH-O); 1,1'-(BOhfip2)2Fc was further oxidized giving [1,1'-(BOhfip2)2Fc]+[Al(ORF)4]– by oxidation of 1,1'-(BOhfip2)2Fc with Ag+[Al(ORF)4]– (RF = C(CF3)3). Their X-ray crystal structures were determined and give further information on the Fe–B interaction through the dip angles α*. In [1,1'-(BOhfip2)2Fc]+[Al(ORF)4]–, this Fe–B interaction is enfeebled: the dip angles α* (0.3º and 5.4º) are significantly smaller than in (BOhfip2)Fc (7.8º) and 1,1'-(BOhfip2)2Fc (8.0º), and the hexafluoroisopropoxy moieties are twisted out of the Cp plane by up to 66.1º. NMR and vibrational spectra support the crystal structure assignments.
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Braunschweig H, Kupfer T. [n]Borametalloarenophanes (n = 1, 2): Strained Systems with Uncommon Reactivity Patterns. Eur J Inorg Chem 2011. [DOI: 10.1002/ejic.201100609] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
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Synthesis of a distanna [2]ferrocenophane and reactivity of [2]ferrocenophanes towards elemental sulfur and selenium. J Organomet Chem 2010. [DOI: 10.1016/j.jorganchem.2010.08.028] [Citation(s) in RCA: 22] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/17/2022]
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Wrackmeyer B, Klimkina EV, Milius W. Synthesis, molecular structure and reactivity of the dimethyl sulfide adduct of a 1,3,2-diselenaborolane with an annelated dicarba-closo-dodecaborane(12) unit. Polyhedron 2010. [DOI: 10.1016/j.poly.2010.04.032] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
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11
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Appel A, Nöth H. Synthesis and Structures of New Borylferrocenes, and Structures of, 2-Chalcogeno-bis(aminoboryl)[3]ferrocenophanes and 1,1′-Tris(di-methylaminoboryl))][3]ferrocenophane [1, 2]. Z Anorg Allg Chem 2010. [DOI: 10.1002/zaac.201000167] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
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12
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Bera H, Braunschweig H, Dörfler R, Kupfer T, Radacki K, Seeler F. Half-Sandwich Tungsten Complexes with Metal- and η5-Cyclopentadienyl-Bound Functional Stannyl Groups and Their Transformation into Ansa Complexes. Organometallics 2010. [DOI: 10.1021/om100324m] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Holger Bera
- Institut für Anorganische Chemie, Universität Würzburg, Am Hubland, D-97074, Würzburg, Germany
| | - Holger Braunschweig
- Institut für Anorganische Chemie, Universität Würzburg, Am Hubland, D-97074, Würzburg, Germany
| | - Rainer Dörfler
- Institut für Anorganische Chemie, Universität Würzburg, Am Hubland, D-97074, Würzburg, Germany
| | - Thomas Kupfer
- Institut für Anorganische Chemie, Universität Würzburg, Am Hubland, D-97074, Würzburg, Germany
| | - Krzysztof Radacki
- Institut für Anorganische Chemie, Universität Würzburg, Am Hubland, D-97074, Würzburg, Germany
| | - Fabian Seeler
- Institut für Anorganische Chemie, Universität Würzburg, Am Hubland, D-97074, Würzburg, Germany
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Scheibitz M, Bolte M, Bats JW, Lerner HW, Nowik I, Herber RH, Krapp A, Lein M, Holthausen MC, Wagner M. C5H4?BR2 Bending in Ferrocenylboranes: A Delocalized Through-Space Interaction Between Iron and Boron. Chemistry 2005; 11:584-603. [PMID: 15580647 DOI: 10.1002/chem.200400690] [Citation(s) in RCA: 118] [Impact Index Per Article: 6.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
Abstract
A comparison of the molecular structures of mono-, di- and tetraborylated ferrocenes [Fc{B(R(1))(R(2))}] (R(1)/R(2)=Br/Br, Br/Fc, Br/Me, Me/Me, Me/OH, OMe/OMe), 1,1'-[fc{B(R(1))(R(2))}(2)] (R(1)/R(2)=Br/Br, Br/Me, OMe/OMe), and 1,1',3,3'-[Fe{C(5)H(3)(BMe(2))(2)}(2)] revealed the boryl substituent(s) to be bent out of the Cp ring plane towards the iron center. The corresponding dip angle alpha* decreases with decreasing Lewis acidity of the boron atom and with increasing degree of borylation at the ferrocene core. This trend is well reproduced by DFT calculations (including [FcBH(2)], not yet accessible experimentally). A Bader analysis of the electron density topology of [FcBH(2)] (alpha*=26.5 degrees ; BP86/TZVP) clearly showed that there is no direct iron-boron bonding in this compound. Instead, strongly delocalized orbital interactions have been identified that involve the boron p orbital, C(ipso) of the adjacent Cp ring, d orbitals at iron, and a through-space interaction with the second Cp ring. A second important factor is attractive electrostatic interactions, which are enhanced upon ligand bending. Cyclic voltammetric measurements on the series [FcBMe(2)], 1,1'-[fc(BMe(2))(2)], and 1,1',3,3'-[Fe{C(5)H(3)(BMe(2))(2)}(2)] indicate a substantial anodic shift in the oxidation potential of the central iron atom upon introduction of BMe(2) substituents. Addition of 4-dimethylaminopyridine (DMAP) does not just counterbalance this effect, but leads to a cathodic shift of the Fe(II)/Fe(III) redox transition far beyond the half-wave potential of parent ferrocene. In the Mossbauer spectra, a continuous decrease in the quadrupole splitting (QS) is observed upon going from parent ferrocene to [FcBMe(2)], to 1,1'-[fc(BMe(2))(2)], and to 1,1',3,3'-[Fe{C(5)H(3)(BMe(2))(2)}(2)]. In contrast, no significant differences are found between the QS values of ferrocene, [Fc(BMe(2)-DMAP)], and 1,1'-[fc(BMe(2)-DMAP)(2)].
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Affiliation(s)
- Matthias Scheibitz
- Institut für Anorganische Chemie, J.W. Goethe-Universität Frankfurt, Marie-Curie-Strasse 11, 60439 Frankfurt/Main, Germany
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Wrackmeyer B, Klimkina EV, Maisel HE, Milius W, Herberhold M. The first 1,3,2-diazabora-[3]ferrocenophanes – molecular structures and dynamic behaviour in solution. Inorganica Chim Acta 2004. [DOI: 10.1016/j.ica.2003.09.039] [Citation(s) in RCA: 23] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
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Amii H, Vranicar L, Gornitzka H, Bourissou D, Bertrand G. Radical-Type Reactivity of the 1,3-Dibora-2,4-Diphosphoniocyclobutane-1,3-diyl. J Am Chem Soc 2004; 126:1344-5. [PMID: 14759184 DOI: 10.1021/ja039920i] [Citation(s) in RCA: 79] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
Despite through-space and through-bond B-B interactions, the stable 1,3-bora-2,4-diphosphoniocyclobutane-1,3-diyl displays some radical-type behavior, as illustrated by the spontaneous formation of the trans 1,3-adduct with trimethyltin hydride and a B-spiro derivative with bromotrichloromethane.
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Affiliation(s)
- Hideki Amii
- Laboratoire Hétérochimie Fondamentale et Appliquée, UMR CNRS 5069, Université Paul Sabatier, 118, route de Narbonne, F-31062 Toulouse Cedex 04, France
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Ma K, Lerner HW, Scholz S, Bats JW, Bolte M, Wagner M. Stepwise assembly and structural characterization of oligonuclear ferrocene aggregates with boron–nitrogen backbone. J Organomet Chem 2002. [DOI: 10.1016/s0022-328x(02)01968-x] [Citation(s) in RCA: 14] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/27/2022]
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Ma K, Fabrizi de Biani F, Bolte M, Zanello P, Wagner M. Electronic Communication in a Series of Novel Multistep Redox Systems. Organometallics 2002. [DOI: 10.1021/om020284r] [Citation(s) in RCA: 20] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Kuangbiao Ma
- Institut für Anorganische Chemie, J.W. Goethe-Universität Frankfurt, Marie-Curie-Strasse 11, D-60439 Frankfurt (Main), Germany, Dipartimento di Chimica dell'Università, Via Aldo Moro, I-53100 Siena, Italy, and Institut für Organische Chemie, J.W. Goethe-Universität Frankfurt, Marie-Curie-Strasse 11, D-60439 Frankfurt (Main), Germany
| | - Fabrizia Fabrizi de Biani
- Institut für Anorganische Chemie, J.W. Goethe-Universität Frankfurt, Marie-Curie-Strasse 11, D-60439 Frankfurt (Main), Germany, Dipartimento di Chimica dell'Università, Via Aldo Moro, I-53100 Siena, Italy, and Institut für Organische Chemie, J.W. Goethe-Universität Frankfurt, Marie-Curie-Strasse 11, D-60439 Frankfurt (Main), Germany
| | - Michael Bolte
- Institut für Anorganische Chemie, J.W. Goethe-Universität Frankfurt, Marie-Curie-Strasse 11, D-60439 Frankfurt (Main), Germany, Dipartimento di Chimica dell'Università, Via Aldo Moro, I-53100 Siena, Italy, and Institut für Organische Chemie, J.W. Goethe-Universität Frankfurt, Marie-Curie-Strasse 11, D-60439 Frankfurt (Main), Germany
| | - Piero Zanello
- Institut für Anorganische Chemie, J.W. Goethe-Universität Frankfurt, Marie-Curie-Strasse 11, D-60439 Frankfurt (Main), Germany, Dipartimento di Chimica dell'Università, Via Aldo Moro, I-53100 Siena, Italy, and Institut für Organische Chemie, J.W. Goethe-Universität Frankfurt, Marie-Curie-Strasse 11, D-60439 Frankfurt (Main), Germany
| | - Matthias Wagner
- Institut für Anorganische Chemie, J.W. Goethe-Universität Frankfurt, Marie-Curie-Strasse 11, D-60439 Frankfurt (Main), Germany, Dipartimento di Chimica dell'Università, Via Aldo Moro, I-53100 Siena, Italy, and Institut für Organische Chemie, J.W. Goethe-Universität Frankfurt, Marie-Curie-Strasse 11, D-60439 Frankfurt (Main), Germany
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Herberhold M, Dörfler U, Wrackmeyer B. The first 1,2-dibora-[2]ferrocenophane and its dynamic behaviour in solution. J Organomet Chem 1997. [DOI: 10.1016/s0022-328x(96)06470-4] [Citation(s) in RCA: 38] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/18/2022]
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21
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Herberhold M, Steffl U, Milius W, Wrackmeyer B. 1,2-Distanna[2]- und 1,2,3-Tristanna[3]ferrocenophane. Angew Chem Int Ed Engl 1996. [DOI: 10.1002/ange.19961081608] [Citation(s) in RCA: 15] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
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22
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Jäkle F, Polborn K, Wagner M. Novel Ferrocene-Based Mono- and Bifunctional Tri-1-pyrazolylborate Ligands. ACTA ACUST UNITED AC 1996. [DOI: 10.1002/cber.19961290603] [Citation(s) in RCA: 73] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
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23
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Jäkle F, Mattner M, Priermeier T, Wagner M. Donor-acceptor substituted ferrocenes. Novel structural motifs by intramolecular acid-base pairing. J Organomet Chem 1995. [DOI: 10.1016/0022-328x(95)05753-c] [Citation(s) in RCA: 31] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
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