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1 Electronic Supplementary Information (ESI) Reactivity of terminal phosphinidene versus Li/Cl phosphinidenoid complexes in cycloaddition chemistry. A case study Rainer Streubel,* a José Manuel Villalba Franco, a Gregor Schnakenburg, a and Arturo Espinosa Ferao b a Institut für Anorganische Chemie der Reinischen Friedrich-Wilhelms-Universität Bonn, Gerhard- Domagk-Str.1, Bonn, Germany. Fax: ; Tel: ; r.streubel@uni-bonn.de. b Departamento de Química Orgánica, Universidad de Murcia,Campus de Espinardo, Murcia, Spain. Table of contents Experimental data. Computational details. Table SI 1: Quadratic difference in softness for the reaction between 3 and either 2b or 7b. Figure SI 1: Computed Gibbs free energy surface for the model conversion 7b+3 5b. Calculated structures: Cartesian coordinates and energies for all computed species S2 S5 S8 S8 S9 S1
2 Experimental data Molecular structure of azaphosphiridine tungsten complex 4 in the crystal (50% probability level, hydrogen atoms except at C(1), C(3), C(4), C(5), are omitted for clarity). Selected bond lengths [Å] and angles [ ]: W P (13), P C (5), P N 1.734(4), P C(7) 1.804(5), C(1) N 1.483(6), C(1) C(2) 1.481(7), P C(1) N 62.0(2), C(1) P-N 49.0(2), C(1)-N-P 68.9(2). X-ray crystallographic analysis of azaphosphiridine complex 4: colorless single crystals were obtained from concentrated n-pentane solutions at 4 C, C 18 H 26 NO 5 PSSi 2 W; crystal size mm, triclinic, P-1, a = (4) Å, b = (5) Å, c = (7) Å; α = (2), β = (3), γ = (3) ; V = (10) Å 3, Z = 2, d calc = mg/m 3, μ = mm -1, collected reflections (unique) / 5984 [R(int) = ], 290 refined parameters, 52 restraints, R 1 (for I > 2σ(I)) = , wr 2 (for all data) = max./min. largest diff. peak and hole and e Å -3 X-ray crystallographic analysis of azaphospholene complex 5: colorless single crystals were obtained from concentrated n-pentane solutions at 4 C, C 18 H 26 NO 5 PSSi 2 W; crystal size mm, triclinic, P-1, a = (3) Å, b = (4) Å, c = (5); α = (10), β = (10), γ = (10) ; V = (8) Å 3, Z = 2, d calc = mg/m 3, μ = mm -1, collected reflections (unique) / 5910, R int = , 269 refined parameters, 0 restraints, R 1 (for I > 2σ(I)) = , wr 2 (for all data) = , max./min. largest diff. peak and hole 0.743/ e Å -3. CCDC (4) and (5) contain the supplementary crystallographic data S2
3 for this paper. These data can be obtained free of charge from The Cambridge Crystallographic Data Centre via Preparative methods All reactions and manipulations were carried out under an atmosphere of dry argon, using Schlenk and vacuum line techniques. Argon was cleaned over a BTS catalyst; the drying of the Ar gas occurred via silica gel and P 2 O 5. Solvents were dried according to standard procedures and stored in brown glasses over sodium wire, and under inert gas atmosphere. Analytical methods Melting point measurements were determined with a Büchi (530) capillary apparatus. Elemental analyses were performed using an Elementar VarioEL analytical gas chromatograph. Mass spectrometry: Electron ionization (70eV) mass spectra were recorded on a Kratos MS 50 or on a MAT 95XL Finnigan spectrometer. NMR spectra were recorded on a Bruker AX 300 spectrometer ( 1 H: MHz, 13 C: 75.0 MHz and 31 P: MHz,) using CDCl 3 as solvent; shifts are given relative to external tetramethylsilane ( 1 H, 13 C,) and 85% H 3 PO 4 ( 31 P). UV/vis spectra were recorded on a Shimadzu UV 1650 PC spectrometer using dichloromethane as solvent and quartz glass cells. IR spectra were recorded with a Thermo Nicolet 380 spectrometer; solid as KBr pellets and liquids as film in a KBr cell. Single crystal structure analysis: Crystal structures were recorded on a Nonius Kappa CCD diffractometer and a Nonius MACH3 diffractometer. The structures were solved by Patterson methods or Direct Methods (SHELXS-97) and refined by full-matrix least squares on F2 (SHELXL-97). All non-hydrogens were refined anisotropically. Hydrogen atoms were included isotropically using the riding model on the bound atoms; in some (denoted) cases hydrogen atoms were located in the Fourier difference electron density. Absorption corrections were carried out analytically or semiempirically from equivalents. Additionally, some calculation of bond lengths and angles were obtained using the Ortep32 program. S3
4 Synthesis of complex 4: A solution of 2 g (3.2 mmol) of 2H-azaphosphirene complex 1 and 0.5 ml (5.0 mmol) of N-[(thiophen-3-yl)methylene]methanamine 3 in 32.0 ml of toluene was stirred for 3h at 75 C whereby the brown solution turned dark red. After removing all volatile components in vacuo (10-2 mbar) the product was subsequently purified by column chromatography thus obtaining a white powder (Al 2 O 3, h = 5 cm, ø = 3 cm, T = -30 C; eluent: petrolether 40/60). Yield: 420 mg (21%); Found C H 4.13, N 2.22, S 5.13, Calc(%): C 33.81, H 4.10, N 2.19, S 5.01, m.p. = C; 1 H-NMR (300.1 MHz, 30 C, CDCl 3 ): δ = 0.07 (s, 3H, Si(CH 3 ) 3 ), 0.41 (s, 3H, Si(CH 3 ) 3 ), 1.04 (d, 2 J P,H = 17.5 Hz, 1H, CH(Si(Me 3 ) 2 ), 2.76 (d, 3 J P,H = Hz, 3H, NCH 3 ), 3.22 (d, 2 J P,H = 6.6 Hz, 1H, P-H-N), 7.24 (d, 3 J H4,H3 = 4.9 Hz, 1H, H4), 7.36 (s, 1H, H5),7.44 (dd, 3 J H3,H4 = 4.9 Hz, 4 J P,H3 = 3.1 Hz, 1H, H3). 13 C{ 1 H}-NMR (75.5 MHz, 30 C, CDCl 3 ): δ = 0.02 (d, 3 J P,C = 3.9 Hz, Si(CH 3 ) 3 ), 0.79 (d, 3 J P,C = 3.5 Hz, Si(CH 3 ) 3 ), 17.4 (d, 1 J P,C = 26.8 Hz, CH(SiMe 3 ) 2 ), 40.9 (d, 1J P,C = 2.3 Hz, P-C-N), 51.7 (d, 2 J P,C = 2.26, N-CH 3 ), (d, 2 J P,C = 3.5 Hz, C3), (s, C5), (s, C4), (d, 2 J P,C = 4.5 Hz, C2), (dsat, 2 J P,C = 8.1 Hz, 1 J W,C = Hz, cis-co), (d, 2 J P,C = 28.4 Hz, trans-co). 31 P-NMR (121.5 MHz, 30 C, CDCl 3 ): δ = (tdsat, 1 J W,P = Hz, 3 J P,H = Hz, 2 J P,H7 = 17.4 Hz, 2 J P,H1 = 6.6 Hz). MS (EI, 184 W): m/z (%):639.0 ([M]+,19), ([M-3CO]+, 10), ([M-COArCHNMe]+, 100), (M-4CO-ArCHNMe]+, 28), ([M-5CO- C 6 H 7 NSCH 3 H]+, 45), 73.1 ([SiMe 3 ]+, 79). IR (KBr): ~ ν = (b, ν-ch), 2072 (s, ν-co), 1947 (s, ν-co), 1462 (s, ν-co/ar) cm 1. UV/Vis (CH 2 Cl 2 ): λ max (abs.) = (1.55), (0.30). X-ray crystallographic analysis (colorless single crystals were obtained from concentrated n-pentane solutions at 4 C): C 18 H 26 NO 5 PSSi 2 W; crystal size mm, monoclinic, P-1, a = (4) Å, b = (5) Å, c = (7) Å; β = (3), V = (10) Å 3, Z = 2, d calc = mg/m 3, μ = mm -1, collected reflections (unique) / 5984 [R(int) = ], 290 refined parameters, 52 restraints, R 1 (for I > 2σ(I)) = , wr 2 (for all data) = max./min. largest diff. peak and hole and e Å -3. Synthesis of complex 5a: To a solution of 380 mg (0.65 mmol) of dichlorophosphane complex 1 and 0.1 ml (0.65 mmol) of 12-crown-4 in 30 ml of THF 0.49 ml (0.78 mmol) of tert-butyl lithium (1.5 M in n-hexane) were slowly S4
5 added at -78 C. After 15 min ml (1.3 mmol) of N-[(thienyl-3- yl)methylene]methanamine were slowly added. The color of the solution changed to orange. After warming to room temperature all volatile components were removed in vacuo (~10-2 mbar). Complex 6 was purified by crystallization from n-pentane at - 50 ºC and obtained as pale yellow solid. Yield: 226 mg (55%); Found: C H 4.14, N 2.19, S 4.90, Calc(%): C 33.81, H 4.10, N 2.19, S 5.01, m.p. = C; 1 H-NMR (300.1 MHz, 30 C, CDCl 3 ): δ = 0.21 (s, 3H, Si(CH 3 ) 3 ), 0.29 (s, 3H, Si(CH 3 ) 3 ), 1.61 (d, 2 JP,H = 9.7 Hz, 1H, CH(Si(Me 3 ) 2 ), 2.64 (d, 3 J P,H = Hz, 3H, NCH 3 ), 5.29 (ft, 3 J P,H = 3.6 Hz, 4 JH1,H5 = 3.6 Hz 1H, P-H-S), 5.84 (dd, 4 J H5,H3 = 3,47 Hz, 3 J P,H5 = H, H5), 6.06 (d, 3 J H3,H2 = 5.82 Hz 1H, H3), 6.21 (dd, 3J H2,H3 = 5.82 Hz, 4 J P,H2 = 3.45 Hz, 1H, H2). 13 C{ 1 H}-NMR (75.5 MHz, 30 C, CDCl 3 ): δ = 2.89 (d, 3 J P,C = 1.1 Hz, Si(CH 3 ) 3 ), 3.15 (d, 3 J P,C = 4.2 Hz, Si(CH 3 ) 3 ), 27.2 (d, 1 J P,C = 3.1 Hz, CH(SiMe 3 ) 2 ), 42.4 (d, 1 J P,C = 3.6 Hz, N-CH 3 ), 62.7 (d, 1 J P,C = 25.9 Hz, S-C-P), (d, 2 J P,C = 6.1 Hz, C3), (s, C4), (d, 3 J P,C = 3.2 Hz, C2), (d, 2 J P,C = 7.4 Hz, C5), (d Sat, 2 J P,C = 6.9 Hz, 1 J W,C = Hz, cis-co), (d, 2 J P,C = 26.1 Hz, trans-co). 31 P-NMR (121.5 MHz, 30 C, CDCl 3 ): δ = (d sat, 1 J W,P = Hz, 2 J P,H = 9.7 Hz). MS (EI, 184 W): m/z (%): (14) ([M]+), (5) ([M-3CO]+), (20) ([M-5CO]+), (44) ([M-CO-ArCHNMe]+), (45) ([M-5CO-C 6 H 7 NS- CH 3 ]+), 73.1 (100) ([SiMe 3 ]+). IR (KBr): ~ ν = 2924 (b, νch), 2853 (s, νch), 2067 (s, νco), 1987 (s, νco), 1937 (s, shoulder, νco), 1461 (s, νc-c/ar) cm -1. UV/Vis (CH 2 Cl 2 ): λ max /nm 235 (ε/dm 3 mol 1 cm ), X-ray crystallographic analysis (colorless single crystals were obtained from concentrated n-pentane solutions at 4 C): C 18 H 26 NO 5 PSSi 2 W; crystal size mm, triclinic, P-1, a = (3) Å, b = (4) Å, c = (5); β = (10), V = (8) Å 3, Z = 2, d calc = mg/m 3, μ = mm -1, collected reflections (unique) / 5910, R int = , 269 refined parameters, 0 restraints, R 1 (for I > 2σ(I)) = , wr 2 (for all data) = , max./min. largest diff. peak and hole 0.743/ e Å -3. S5
6 Computational details Quantum chemical calculations were performed with the ORCA electronic structure program package. 1 Unless otherwise stated all geometry optimizations were run in redundant internal coordinates with tight convergence criteria, 2 in the gas-phase and using the BP86 3 functional together with the def2-tzvp basis set. 4 In the case of intermediates 8a and 9a Grimme s semiempirical dispersion forces correction 5 (denoted as D after the functional s name) was also included (i.e. BP86-D functional) and accounting for solvent effects (THF) via the COSMO solvation model. 6 Additionally, for checking purposes a second refinement for compound 8b was also performed with the B3LYP functional 7 and dispersion correction (i.e. B3LYP-D functional) and COSMO salvation. For W atoms the [SD(60,MWB)] effective core potential 8 (ECP) was used. Harmonic frequency calculations verified the nature of ground states or transition states (TS) having all positive frequencies or only one imaginary frequency, respectively. For the later, the correct nature of the TS was checked by intrinsic reaction coordinate (IRC) calculations. The electron density at bond critical points, ρ(r c ), derived from the topological analysis within the context of Bader s atoms-in-molecules (AIM) methodology, 9 was computed using the AIM2000 software 10 and wavefunctions 1 ORCA an ab initio, density functional and semiempirical program package. Written by F. Neese. Version 2.8.0, Universität Bonn, Web page: 2 Energy change hartree; maximum gradient hartree/a 0 ; RMS gradient hartree/a 0 ; maximum displacement a 0 ; RMS displacement a 0. 3 (a) Becke, A. D. Phys. Rev. A., 1988, 38, ; (b) Perdew, J. P. Phys. Rev. B. 1986, 33, Weigend, F.; Ahlrichs, R. Phys. Chem. Chem. Phys., 2005, 7, a) Grimme, S. J. Comput. Chem., 2004, 25, b) Grimme, S. J. Comput. Chem., 2006, 27, Klamt, A.; Schüürmann, G. J. Chem. Soc. Perkin Trans , 220, Klamt, A. J. Phys. Chem. 1995, 99, Becke, A. D. J. Chem. Phys., 1993, 98, Lee, C. T.; Yang, W. T.; Parr, R. G. Phys. Rev. B, 1988, 37, Andrae, D.; Haeussermann, U.; Dolg, M.; Stoll, H.; Preuss, H. Theor. Chim. Acta, 1990, 77, ECP basis sets for W [SD(60,MWB)] have been obtained from Turbomole basis set library at ftp://ftp.chemie.uni-karlsruhe.de/pub/basen/. 9 Bader, R. F. W. in Atoms in Molecules: A Quantum Theory, Oxford University Press, Oxford, (a) AIM2000 v. 2.0, designed by Biegler-König, F. and Schönbohm, J Home page Biegler-König, F.; Schönbohm, J.; Bayles, D. J. Comp. Chem. 2001, 22, (b) Biegler-König, F.; Schönbohm, J. J. Comp. Chem. 2002, 23, S6
7 (B3LYP/def2-TZVP) generated with the Gaussian 09 software. 11 From these optimized geometries all other reported data were obtained by means of single-point (SP) calculations using the more polarized def2-tzvpp 12 basis set. Reported energies were corrected for the zero-point vibrational term at the optimization level and computed at the RI-SCS-MP2 level of theory. 13 Mulliken charges were obtained using the B3LYP functional. The concept of softness 14 has been found to be intimately related to fundamental variables of DFT. Softness and philicity parameters were computed using Mulliken charges. Quadratic differences in philicity, Δ(ω 2 ) kl, were obtained from group philicities. 15 These group quantities were obtained via the Fukui functions 16 adapted for reflecting changes in group charges, that were in turn computed from the atomic charge of the atom involved in the bond under consideration, after adding the charges of all directly adjacent atoms. Every path was computed as the sum of the contributions of two nucleophilic attacks of the imine N atom to phosphorus and from the later to either the thiazole C2 ([4+1] path) or the imine C atom ([2+1] path). 11 Gaussian 09, Revision A.02, Frisch, M. J.; Trucks, G. W.; Schlegel, H. B.; Scuseria, G. E.; Robb, M. A.; Cheeseman, J. R.; Scalmani, G.; Barone, V.; Mennucci, B.; Petersson, G. A.; Nakatsuji, H.; Caricato, M.; Li, X.; Hratchian, H. P.; Izmaylov, A. F.; Bloino, J.; Zheng, G.; Sonnenberg, J. L.; Hada, M.; Ehara, M.; Toyota, K.; Fukuda, R.; Hasegawa, J.; Ishida, M.; Nakajima, T.; Honda, Y.; Kitao, O.; Nakai, H.; Vreven, T.; Montgomery, Jr., J. A.; Peralta, J. E.; Ogliaro, F.; Bearpark, M.; Heyd, J. J.; Brothers, E.; Kudin, K. N.; Staroverov, V. N.; Kobayashi, R.; Normand, J.; Raghavachari, K.; Rendell, A.; Burant, J. C.; Iyengar, S. S.; Tomasi, J.; Cossi, M.; Rega, N.; Millam, N. J.; Klene, M.; Knox, J. E.; Cross, J. B.; Bakken, V.; Adamo, C.; Jaramillo, J.; Gomperts, R.; Stratmann, R. E.; Yazyev, O.; Austin, A. J.; Cammi, R.; Pomelli, C.; Ochterski, J. W.; Martin, R. L.; Morokuma, K.; Zakrzewski, V. G.; Voth, G. A.; Salvador, P.; Dannenberg, J. J.; Dapprich, S.; Daniels, A. D.; Farkas, Ö.; Foresman, J. B.; Ortiz, J. V.; Cioslowski, J.; Fox, D. J. Gaussian, Inc., Wallingford CT, Bergner, A.; Dolg, M.; Kuchle, W.; Stoll, H.; Preuss, H. Mol. Phys. 1993, 80, Obtained from the EMSL Basis Set Library at D. Feller, J. Comp. Chem., 1996, 17, Gerenkamp, M; Grimme, S. Chem. Phys Lett, 2004, 392, Grimme, S. J. Chem. Phys., 2003, 118, Yang, W.; Parr, R. G. Proc. Natl. Acad. Sci. U.S.A., 1985, 82, R. Parthasarathi, J. Padmanabhan, M. Elango, V. Subramanian and P. K. Chattaraj, Chem. Phys. Lett., 2004, 394, Parr, R. G.; Yang, W. J. Am. Chem. Soc. 1984, 106, S7
8 Table SI 1: Calculated (B3LYP/def2-TZVPPecp//BP86/def2-TZVPecp) quadratic difference in softness, a) Δ(s 2 ) kl, for the reaction of 3 with either 2b or 7b. [4+1] path [2+1] path 3 + 2b b (without 12-crown-4) b a) Computed at the group level using Mulliken charges. Figure SI 1: Calculated COSMO(THF)/RI-SCS-MP2/def2-TZVPP(ecp)] Gibbs free energy profile for the model conversion 7b+3 5b (12C4 = 12-crown-4). S8
9 Calculated structures. Cartesian coordinates (in Å) and energies for all computed species.- 2b: E = au (BP86/def2-TZVP) W C C C C C O O O O O C H H H : E = au (BP86/def2-TZVP) ZPE= au E = au (COSMO THF /SCS-MP2/def2-TZVPP) C C C C S H H H C H N C H H H b [(12-crown-4)LiCl]: E = au (BP86/def2-TZVP) ZPE= au E = au (COSMO THF /SCS-MP2/def2-TZVPP) S9
10 N C H C C C C S H H H C H H H W C C C C C O O O O O C H H H Cl Li O C H H C H H O C H H C H H O C H H C H H O C H H C H H b without 12-crown-4: E = au (BP86/def2-TZVP) ZPE= au W C C C C C O O O O O C H H H Li Cl b: E = au (BP86/def2-TZVP) ZPE= au E = au (COSMO THF /SCS-MP2/def2-TZVPP) W C C C C C O O O O O C H H H S10
11 Cl Li O C H H C H H O C H H C H H O C H H C H H O C H H C H H b 3: E = au (BP86/def2-TZVP) ZPE= au E = au (COSMO THF /SCS-MP2/def2-TZVPP) N C H C C C C S H H H C H H H W C C C C C O O O O O C H H H Cl Li O C H S11
12 H C H H O C H H C H H O C H H C H H O C H H C H H TS1(7b 3 8b): E = au (BP86/def2-TZVP) ZPE= au E = au (COSMO THF /SCS-MP2/def2-TZVPP) N C H C C C C S H H H C H H H W C C C C C O O O O O C H H H Cl Li O C H H C H H O C H H C H H O C H H C H H O C H H C H H a: E = au (COSMO THF /BP86-D/def2-TZVP) N C H C C C C S H H H S12
13 C H H H W C C C C C O O O O O Cl Li O C H H C H H O C H H C H H O C H H C H H O C H H C H H H C Si H H C C C H Si H H H H H H C C C H H H H H H H H H b: E = au (BP86/def2-TZVP) ZPE= au E = au (COSMO THF /SCS-MP2/def2-TZVPP) S13
14 N C H C C C C S H H H C H H H W C C C C C O O O O O C H H H Cl Li O C H H C H H O C H H C H H O C H H C H H O C H H C H H b COSMO THF /B3LYP-D: E = au (COSMO THF /B3LYPD/def2-TZVP) N C H C C C C S H H H C H H H W C C C C C O O O O O C H H H Cl Li O C H H C H H O C H H C H H O C H H C H H O C H H S14
15 C H H TS2(8b 9b): E = au (BP86/def2-TZVP) ZPE= au E = au (COSMO THF /SCS-MP2/def2-TZVPP) N C H C C C C S H H H C H H H W C C C C C O O O O O C H H H Cl Li O C H H C H H O C H H C H H O C H H C H H O C H H C H H a: E = au (COSMO THF /BP86-D/def2-TZVP) N C H C C C C S H H H C H H H W C C C C C O O O O O Cl Li O C H H C S15
16 H H O C H H C H H O C H H C H H O C H H C H H C Si H H H C C C H Si H H H H H H C C C H H H H H H H H H b: E = au (BP86/def2-TZVP) ZPE= au E = au (COSMO THF /SCS-MP2/def2-TZVPP) N C H C C C C S H H H C H H H W C C C C C O O O O O C H H S16
17 H Cl Li O C H H C H H O C H H C H H O C H H C H H O C H H C H H TS3(9b 5b): E = au (BP86/def2-TZVP) ZPE= au E = au (COSMO THF /SCS-MP2/def2-TZVPP) N C H C C C C S H H H C H H H W C C C C C O O O O O C H H H Cl Li O C H H C H H O C H H C H H O C H H C H H O C H H C H H S17
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