Synthesis of enantiomeric pure lithium and potassium benzamidinate complexes |
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Authors: | Paul Benndorf |
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Institution: | Institut für Anorganische Chemie, Karlsruher Institut für Technologie (KIT), Engesserstraße Geb. 30.45, 76131 Karlsruhe, Germany |
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Abstract: | A new synthesis leading to the chiral amidines (S,S)- and (R,R)-N,N-bis-(1-phenylethyl)benzamidine ((S)- and (R)-HPEBA) in good yields is presented. Further reaction of (S)-HPEBA with n-BuLi gave the chiral lithium salt (S)-LiPEBA. Treatment of KH with (S)-HPEBA in boiling THF afforded the corresponding potassium salt (S)-KPEBA. In contrast by performing the reaction in boiling toluene a fast racemization was observed. In the solid state racemic KPEBA formed a dimer, in which all four nitrogen atoms are in a plane. To each potassium atom a toluene molecule is η6-coordinated. |
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Keywords: | Amidinate Chelates Chirality Lithium Potassium X-ray structures |
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