0.06 e A-' vs. 0.04 e A-' in general positions). The density maxima of the tetrahedral bonds are located 0.37 A outwards from the bond axis. Therefore these bonds are bent by 26". The tetrahedrane bond is thus one of the most strongly bent C-C bonds.151 Theoretical calculations[61 give bends of the same order of magnitude. An arc over the density maximum between two tetrahedrane C-atoms is 1.7 A long, whereas the distance between the atoms is 1.497 A. The density maxima of the bonds between the tetrahedrane C-atoms and the quarternary C-atoms of the tert-butyl groups (Fig. 2) lie exactly on the connecting lines between the atoms. This is also the case for the Cquar,-Cmethyl bonds of the tert-butyl groups. German version: Angew. Chem. 99 (1987) 356 Fig. I . Packing diagram of the argon inclusion crystal of 1 (projection along c); argon atoms marked by circles.
Es besteht nach wie vor grol3es Interesse an C3-Bausteinen fur Synthesen funktionalisierter Cyclopentane durch (3 + 21-Cycloaddition. Neben ionischen C3-Komponenten['I werden dazu neuerdings metallorganische C3-Bausteine rnit 1,3-dipolPquivalenten Eigen~chaften[*.~] eingesetzt. Wir beschrieben kiirzlich die Darstellung von Cyclopentanen durch [3 + 1 + I]-Cycloaddition von Vinyl~arben-'~] C-5), 12.99 (9, CH,). -IR (KBr): J(C=O)-1690 cm-'. -MS (70 ev): m/z 260 (Me, I W o ) , 259 (16, 144' -H), 245 (16. Me-CH,), 231 (16,259-CO), I**] Organische Synthesen mit Ubergangsmetall-Komplexen, 22. Mitteilung. 217 160. M@-C,H.Ol 216 (30). 215 (441. 202 (40). 115 170, [' I Prof. Dr. R. Aumann, Ing. (grad.) J. Uphoff Organisch-chemisches lnstitut der Universitst Orleans-Ring 23, D-4400 Miinster -~ ,. . ,, . I . ,. 231 -b3H3(C6Hs)) Diese Arbeit wurde vom Fonds der Chemischen lndustrie gefdrdert. -21. Mitteilung: [4]. Angew. Chem. 99 (1987) Nr. 4 0 VCH Verlagsgesellsehajl mbH. D-6940 Wernheim. 1987 0044-8249/87/0404-0361 S 02.50/0 lnstitut fiir Organische Chemie der Universitat Martin-Luther-King-Platz 6, D-2000 Hamburg 13 vom Fonds der Chemischen lndustrie gefOrdert. [**I Diese Arbeit wurde von der Deutschen Forschungsgemeinschaft und 362 0 VCH Verlagsge.wllschaft mbH. 0-6940 Weinheim. I987
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