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Volumn 27, Issue 3, 2008, Pages 320-323

Synthesis, structure, and facile ring flipping of a bicyclo[1.1.0] tetrasilane

Author keywords

[No Author keywords available]

Indexed keywords

ISOMERIZATION; SYNTHESIS (CHEMICAL);

EID: 39649090980     PISSN: 02767333     EISSN: None     Source Type: Journal    
DOI: 10.1021/om7011375     Document Type: Article
Times cited : (32)

References (51)
  • 1
    • 39649123093 scopus 로고    scopus 로고
    • For reviews on bicyclo[1.1.0]butanes, see: (a) wiberg, K. B. Adv. Alicycl. Chem. 1968, 2, 185.
    • For reviews on bicyclo[1.1.0]butanes, see: (a) wiberg, K. B. Adv. Alicycl. Chem. 1968, 2, 185.
  • 9
    • 4243940423 scopus 로고
    • For reviews on bond stretch isomerism, see: a
    • For reviews on bond stretch isomerism, see: (a) Parkin, G. Chem. Rev. 1993, 93, 887.
    • (1993) Chem. Rev , vol.93 , pp. 887
    • Parkin, G.1
  • 12
    • 39649093708 scopus 로고
    • For concepts of bond stretch isomerism, see: a
    • For concepts of bond stretch isomerism, see: (a) Stohrer, W.-D.; Hoffmann, R. J. Am. Chem. Soc. 1972, 94, 119.
    • (1972) J. Am. Chem. Soc , vol.94 , pp. 119
    • Stohrer, W.-D.1    Hoffmann, R.2
  • 30
    • 0030994283 scopus 로고    scopus 로고
    • 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.
    • 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.
  • 37
    • 39649105950 scopus 로고    scopus 로고
    • 14 with lithium followed by 1,2-dibromoethane. Details of the preparation of 3 and 6 are shown in the Supporting Information.
    • 14 with lithium followed by 1,2-dibromoethane. Details of the preparation of 3 and 6 are shown in the Supporting Information.
  • 39
    • 39649091024 scopus 로고    scopus 로고
    • 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
    • 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).
  • 40
    • 39649112228 scopus 로고    scopus 로고
    • 3, R1 = 7.2%, wR2 = 13.5%, GOF = 1.32.
    • 3, R1 = 7.2%, wR2 = 13.5%, GOF = 1.32.
  • 41
    • 39649107393 scopus 로고    scopus 로고
    • 5
    • 5
  • 45
    • 39649115467 scopus 로고    scopus 로고
    • 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
    • 5h,i
  • 46
    • 39649106720 scopus 로고    scopus 로고
    • 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.
    • 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.
  • 47
    • 39649090353 scopus 로고    scopus 로고
    • For the Eyring plot, see the Supporting Information
    • For the Eyring plot, see the Supporting Information.
  • 48
    • 33845281819 scopus 로고    scopus 로고
    • 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
    • 5h
  • 49
    • 0037040584 scopus 로고    scopus 로고
    • 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.
    • 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.


* 이 정보는 Elsevier사의 SCOPUS DB에서 KISTI가 분석하여 추출한 것입니다.