In der „klassischen”︁ Cyclopropanierung von Bicyclo[1.1.0]butan‐Derivaten und in der Carbenoid‐Cyclisierung von 1‐Lithio‐1‐halo‐3‐alkylidencyclobutanen, bei denen der Vierring Teil eines Bicyclo[3.1.1]heptan‐ oder Bicyclo[2.1.1]hexan‐Systems ist, wurden zwei effiziente Wege zu [1.1.1]Propellanen gefunden. Von zwei Modellen, 61 und 45, wurden die Röntgenstrukturen ermittelt.
The title compounds, e.g. (VIII)‐(XI), (XIV), (XVII), (XVIII), are accessible using two routes: 1. the "classical" cyclopropanation of bicyclobutane derivatives such as (I) gives rise to (VIIIa); (VIIIb), (IX), (X), and (XI) are synthesized by similar, partly modified procedures using appropriate precursors corresponding to (I) and (II).
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