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39649093708
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For stable compounds including the silabicyclo[1.1.0]tetrasilane moiety, see: (a) Ando, W.; Shiba, T.; Hidaka, T.; Morihashi, K.; Kikuchi, O. J. Am. Chem. Soc. 1997, 119, 3629.
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For stable compounds including the silabicyclo[1.1.0]tetrasilane moiety, see: (a) Ando, W.; Shiba, T.; Hidaka, T.; Morihashi, K.; Kikuchi, O. J. Am. Chem. Soc. 1997, 119, 3629.
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(a) Kira, M.; Iwamoto, T.; Kabuto, C. J. Am. Chem. Soc. 1996, 118, 10303.
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Iwamoto, T.1
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14 with lithium followed by 1,2-dibromoethane. Details of the preparation of 3 and 6 are shown in the Supporting Information.
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14 with lithium followed by 1,2-dibromoethane. Details of the preparation of 3 and 6 are shown in the Supporting Information.
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Kira, M.; Iwamoto, T.; Maruyama, T.; Kuzuguchi, T.; Yin, D.; Kabuto, C.; Sakurai, H. Dalton Trans. 2002, 1539.
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Kira, M.1
Iwamoto, T.2
Maruyama, T.3
Kuzuguchi, T.4
Yin, D.5
Kabuto, C.6
Sakurai, H.7
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39
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39649091024
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3: air-sensitive yellow crystals; mp <0 °C dec; 1H NMR (400 MHz, toluene-d8, 243 K, δ) 0.44 (s, 12H, Si-Me, 0.46 (s, 24H, Si-Me, 1.20 (s, 54H, t-Bu, 1H NMR (400 MHz, toluene-d8, 208 K, δ) 0.44 (s, 12H, Si-Me, 0.48 (s, 12H, Si-Me, 0.50 (s, 12H, Si-Me, 1.23 (s, 54H, t-Bu, 13C NMR (100 MHz, THF-d8, 208 K, δ, 0.9, 3.4 (br, 17.9 (br, 19.8 (br, 20.5, 27.6, 28.8, 30.1; 29Si NMR (79.5 MHz, toluene-d8, 208 K, δ, 145.1 (S(SiMe2-t-Bu, 90.6 (Si(SiMe2-t-Bu) 2, 3.7 (br, Si(AMe2-Z-Bu)2, 8.1 (br, Si(SiMe2-t-Bu)2, 8.7 (Si(SiMe2-t-Bu, UV-vis (3-methylpentane, 230 K) λmax (ε/103) 299 (16.6, 390 (2.6, 459 1.3, Anal. Calcd for C36H 90Si10: C, 53.78; H, 11.28. Found: C, 53.68; H, 11.19. The UV-vis spectra of
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10: C, 53.78; H, 11.28. Found: C, 53.68; H, 11.19. The UV-vis spectra of 3 are remarkably temperature dependent between 110 and 230 K, with an isosbestic point at 395 nm (see Figure S1 in the Supporting Information).
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40
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3, R1 = 7.2%, wR2 = 13.5%, GOF = 1.32.
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3, R1 = 7.2%, wR2 = 13.5%, GOF = 1.32.
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(c) Inagaki, S.; Kakefu, T.; Yamamoto, T.; Wasada, H. J. Phys. Chem. 1996, 100, 9615.
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Inagaki, S.1
Kakefu, T.2
Yamamoto, T.3
Wasada, H.4
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45
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Although in previous several theoretical papers5a-h both LB and SB structures have been located as local minima for 7, recent calculations for 7 at higher theoretical levels show no energy minimum at the SB structure.5h,i
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5h,i
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46
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39649106720
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1H NMR spectra of 3 was performed using the gNMR program package: Peter, H. M.; gNMR V4.1.0; Cherwell Scientific: Oxford, U.K., 1999.
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1H NMR spectra of 3 was performed using the gNMR program package: Peter, H. M.; gNMR V4.1.0; Cherwell Scientific: Oxford, U.K., 1999.
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47
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For the Eyring plot, see the Supporting Information
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For the Eyring plot, see the Supporting Information.
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48
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33845281819
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Collins, S, Durler, R, Rauk, A. J. Am. Chem. Soc. 1987, 109, 2564; 1987, 109, 6217, correction, While Collins et al. have estimated the energy difference between the short-bond structure and planar transition state as the ring-flipping barrier, Gordon et al. have found a ring-flipping pathway connecting short-bond and long-bond isomers of 1,3-disubstituted bicyclotetrasilanes (1,3-R2H4Si 4 (R, H, Me, t-Bu, The energy difference between the short-bond isomer and the transition state of the ring flipping is dependent on the level of theory: 7.9 kcal mol-1 at the GVB/6-31G(d)//GVB/3-21G* level and 17.5 kcal mo-l at the MP2/6-31G(d)//GVB/3-21G* level for the parent bicyclotetrasilane (7).5h
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22 See also for related main-group-element analogues of planar cyclobutane-1,3-diyl: Scheschkewitz, D.; Amii, H.; Gornitzka, H.; Schoeller, W. W.; Bourissou, D.; Bertrand, G. Science 2002, 295, 1880.
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22 See also for related main-group-element analogues of planar cyclobutane-1,3-diyl: Scheschkewitz, D.; Amii, H.; Gornitzka, H.; Schoeller, W. W.; Bourissou, D.; Bertrand, G. Science 2002, 295, 1880.
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0042531956
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Schoeller, W. W.; Rozhenko, A.; Bourissou, D.; Bertrand, G. Chem. Eur. J. 2003, 9, 3611.
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Schoeller, W.W.1
Rozhenko, A.2
Bourissou, D.3
Bertrand, G.4
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