Sowohl die cyclischen Chlor-und Quecksilberverbindlingen 6 und 9 als auch die offenkettige Chlorverbindung 7 liefern bei der Umsetzung mit Lithiumpulver in Diethylether die reine etherfreie Cyclopropylmethyllithitim-Verbindung 10. Nur bei -60°C lassen sich ausgehend von 7 noch 8% der entsprechenden offenkettigen Lithiurnverbindung 11 neben 10 nachweisen. Die Rontgenstrukturanalyse von 10 ergab hexamere Cluster, in denen die Lithiumatome ein trigonales Antiprisma bilden, dessen obere und untere Dreiecksflache unbesetzt ist, wahrend iiber jcder der sechs seitlichen Dreiecksflachen ein 2,2,3,3-Tetramethylcyclopropylmethyl-Rest koordiniert ist.
Synthesis and Crystal Structure of 3-(Lithiomethyl)-l,l,2,2-tetramethyIcyclopropane, a Stable Cyclopropylmethyllithium CompoundThe cyclic chlorine and mercuiy compounds 6 and 9 as well as the open-chain chloro compound 7 react with lithium powder in diethyl ether to afford the pure cyclopropylmethyllithium compound 10 completely free of diethyl ether. Only at -6 0°C starting with 7 besides 10 8% of the corresponding open-chain organolithium compound 11 was detected. X-ray analysis of 10 showed solvent-free hexameric clusters with the lithium atoms forming a trigonal antiprism with unoccupied triangular faces on the top and at the bottom while each of the six laterally triangular faces is coordinated to a 2,2,3,3-tetramethylcyclopropylmethyl ligand.
~~~~~ ~Chem. Ber.
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