Chalcogeno Methylene Phosphoranes 2,4,6-tBu₃C₆H₂-P(=X)=C(Sime₃)₂, X = O, S, Se Crystal Structure, ³¹P CP Mas NMR and IGLO Calculations

V. Von Der Gönna Anorganisch-Chemisches Institut der Universität Bonn, Germany

M. Niegeri Anorganisch-Chemisches Institut der Universität Bonn, Germany

E. Niecke Anorganisch-Chemisches Institut der Universität Bonn, Germany

H. Beckmann Institut für Analytische Chemie, Technische Universitiät Dresden, Germany

K. Kruger Institut für Analytische Chemie, Technische Universitiät Dresden, Germany

G. Ohms Institut für Analytische Chemie, Technische Universitiät Dresden, Germany

G. Grossmann Institut für Analytische Chemie, Technische Universitiät Dresden, Germany

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Abstract

Chalcogeno methylene phosphoranes 2,4,6-tBu₃C₆H₂P(=X)=C(SiMe₃)₂ with X = O, S or Se were synthesized and their crystal structures characterized by means of X-ray structure analysis. ³¹P CP MAS NMR measurements and IGLO calculations of model compounds C₆H₅P(=X)(=CH₂) allow to study the influence of the chalcogeno substituent X on the principal values of the nuclear magnetic shielding tensor σ_ii.

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Chalcogeno Methylene Phosphoranes 2,4,6-tBu₃C₆H₂-P(=X)=C(Sime₃)₂, X = O, S, Se Crystal Structure, ³¹P CP Mas NMR and IGLO Calculations

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Chalcogeno Methylene Phosphoranes 2,4,6-tBu3C6H2-P(=X)=C(Sime3)2, X = O, S, Se Crystal Structure, 31P CP Mas NMR and IGLO Calculations

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Chalcogeno Methylene Phosphoranes 2,4,6-tBu₃C₆H₂-P(=X)=C(Sime₃)₂, X = O, S, Se Crystal Structure, ³¹P CP Mas NMR and IGLO Calculations