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Volumn 275, Issue 5296, 1997, Pages 60-61

A free cyclotrigermenium cation with a 2π-electron system

Author keywords

[No Author keywords available]

Indexed keywords

GERMANIUM DERIVATIVE;

EID: 0031014961     PISSN: 00368075     EISSN: None     Source Type: Journal    
DOI: 10.1126/science.275.5296.60     Document Type: Article
Times cited : (139)

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    • note
    • Crystals of 1 (20 mg, 0.02 mmol) and trityl tetraphenylborate (20 mg, 0.036 mmol) were put in a glass tube and degassed. Dry oxygen-free benzene was introduced by vacuum transfer and the solution was stirred at room temperature. The solution turned from dark red due to 1 to yellow within 1 min; and the dark brown viscous oil containing 2 separated from the solution. The oily substance was washed with benzene and subsequently with hexane in a glove box to afford air-and moisture-sensitive yellow powders of 2.
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    • note
    • 3C radical. However, the details of this reaction are not clear at this moment.
  • 42
    • 15644384115 scopus 로고    scopus 로고
    • note
    • max (wavelength, maximum of absorption) 276 nm, 350 nm.
  • 43
    • 15644374836 scopus 로고    scopus 로고
    • note
    • tBu groups are the main contributing factor to the relatively high R factors. Coordinates will be deposited in the Cambridge Crystallographic Database.
  • 44
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    • 3 (Mes = 2,4,6-trimethylphenyl), has recently been synthesized and shown to be a metallic ring system possessing aromatic character [X.-W. Li, W. T. Pennington, G. H. Robinson, J. Am. Chem. Soc. 117, 7578 (1995); Y. Xie, P. R. Schreiner, H. F. Schaefer III, X.-W. Li, G. H. Robinson, ibid. 118, 10635 (1996)].
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    • Li, X.-W.1    Pennington, W.T.2    Robinson, G.H.3
  • 45
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    • 3 (Mes = 2,4,6-trimethylphenyl), has recently been synthesized and shown to be a metallic ring system possessing aromatic character [X.-W. Li, W. T. Pennington, G. H. Robinson, J. Am. Chem. Soc. 117, 7578 (1995); Y. Xie, P. R. Schreiner, H. F. Schaefer III, X.-W. Li, G. H. Robinson, ibid. 118, 10635 (1996)].
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    • Xie, Y.1    Schreiner, P.R.2    Schaefer III, H.F.3    Li, X.-W.4    Robinson, G.H.5
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    • -1 (9)
    • -1 (9).
  • 47
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    • Electropositive substituents such as silyl groups generally lead to planar Ge=Ge double bonds rather than frans-bent structures (10). In addition, such electropositive substituents are predicted to reduce the strain within three-membered rings formed by group 14 elements considerably [S. Nagase, Pure Appl. Chem. 65, 675 (1993)].
    • (1993) Pure Appl. Chem. , vol.65 , pp. 675
    • Nagase, S.1
  • 48
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    • Supported by the Ministry of Education, Science, and Culture of Japan (number 07454159). We also thank ASAI Germanium Research Institute for supplying the tetrachlorogermane
    • Supported by the Ministry of Education, Science, and Culture of Japan (number 07454159). We also thank ASAI Germanium Research Institute for supplying the tetrachlorogermane.


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