高等学校化学学报

高等学校化学学报 ›› 1998, Vol. 19 ›› Issue (S1): 321.

• Organometallic Chemistry • 上一篇    下一篇

Study on Reactivity of Five-co-ordinate Bicycloazastannoxides. Ⅲ. Bromination with Bromine

Yang Xiao Ping1, Wang Ji Tao2   

  1. 1. Department of Chemistry, Liaoning Normal University, Dalian 116029;
    2. Deparment of Chemistry, Nankai University, Tianjin 300071
  • 出版日期:1998-12-31 发布日期:1998-12-31
  • 基金资助:
    This work was supported by the National Key Lab of the Elemento Organic Chemistry in China

Study on Reactivity of Five-co-ordinate Bicycloazastannoxides. Ⅲ. Bromination with Bromine

Yang Xiao Ping1, Wang Ji Tao2   

  1. 1. Department of Chemistry, Liaoning Normal University, Dalian 116029;
    2. Deparment of Chemistry, Nankai University, Tianjin 300071
  • Online:1998-12-31 Published:1998-12-31
  • Supported by:
    This work was supported by the National Key Lab of the Elemento Organic Chemistry in China

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摘要： In earlier our studies, we have determined that the structure of pentacoordinate bicycloazastannoxides with Schifibase derived from amino acids is similar to that of the metal vitamin B6 chelates by X-ray method[l-3]. Recently we investigated the condensation of pentacoordinate bicycloazastannoxides with aldehydes[4] and first determined the thermodynamic α-CH acidity (pKa value) of pentacoordinate bicycloazastannoxides by the accurate spectrophotometeric method for relative equilibrium acidities of weak carbon acids in dimethyl sulfoxide[5]. It was found that the effect of the effect of α-CH acidity and stability of α-carbanions on condensation is important. The bulkiness of the amino acid moieties affects the α-CH acidity directly, and the effect of the bulkiness of amino acid moieties on.their α-CH acidities was interpreted by the Taft equation.

Abstract: In earlier our studies, we have determined that the structure of pentacoordinate bicycloazastannoxides with Schifibase derived from amino acids is similar to that of the metal vitamin B6 chelates by X-ray method[l-3]. Recently we investigated the condensation of pentacoordinate bicycloazastannoxides with aldehydes[4] and first determined the thermodynamic α-CH acidity (pKa value) of pentacoordinate bicycloazastannoxides by the accurate spectrophotometeric method for relative equilibrium acidities of weak carbon acids in dimethyl sulfoxide[5]. It was found that the effect of the effect of α-CH acidity and stability of α-carbanions on condensation is important. The bulkiness of the amino acid moieties affects the α-CH acidity directly, and the effect of the bulkiness of amino acid moieties on.their α-CH acidities was interpreted by the Taft equation.

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