Um bis zu 36° weichen die Ebenen aus den endständigen B-Gerüstatomen und ihren Nachbarn (ipso-C-Atomen) bei den Tetraaryl-1,3-diborataallenen in den Kontaktionentripeln 1 von der für Allene charakteristischen Orthogonalität ab. Die sterische Hinderung zwischen ortho-Methylgruppen, die durch Wechselwirkungen zwischen den Lithium-Gegenionen und den π-Elektronen der Arylringe induziert wird, und die leichte Verdrillbarkeit des Grundgerüsts sind die Ursachen der ungewöhnlichen Geometrien. Ar=2,3,5,6-Tetramethylphenyl u. a.

Dilithium

Allene

10.1002/1521-3757(20010716)113:14<2725::aid-ange2725>3.0.co;2-h

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Citations (7)

CCDC 1996271: Experimental Crystal Structure Determination

The Cambridge Structural Database (2020)

Carsten Präsang Armin Berndt Gertraud Geiseler Werner Massa

10.5517/ccdc.csd.cc2508vb

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Citations (0)

CCDC 1980463: Experimental Crystal Structure Determination

The Cambridge Structural Database (2020)

Carsten Präsang Gertraud Geiseler Achim Berndt Werner Massa

10.5517/ccdc.csd.cc24gtxc

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CCDC 1983186: Experimental Crystal Structure Determination

The Cambridge Structural Database (2020)

Wahid Mesbah Armin Berndt Gertraud Geiseler Werner Massa

10.5517/ccdc.csd.cc24knr4

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CCDC 1992022: Experimental Crystal Structure Determination

The Cambridge Structural Database (2020)

Anna Młodzianowska Armin Berndt Gertraud Geiseler Werner Massa

10.5517/ccdc.csd.cc24vvsn

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A Diboracyclopropane with a Planar‐Tetracoordinate Carbon Atom and a Triborabicyclobutane

Angewandte Chemie International Edition (2003)

Yüksel Şahin Carsten Präsang Matthias Hofmann Govindan Subramanian Gertraud Geiseler

Four-coordinate in a three-membered ring and thereby planar: The chemical shift of the skeletal carbon atom of 1, which was generated and spectroscopically characterized at −90 °C, agrees very well with that computed for the model 2, but differs by 70 ppm from that of the similarly substituted, but distorted-tetrahedral carbon atom in 3. R=SiMe3, Dur=2,3,5,6-tetramethylphenyl.

Tetracoordinate

Carbon atom

Tetrahedron

Carbon fibers

10.1002/anie.200390185

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Citations (30)

CCDC 111362: Experimental Crystal Structure Determination

The Cambridge Structural Database (2001)

J. Grebe Sabine Schlecht F. Weller Κ. Harms Gertraud Geiseler

An entry from the Cambridge Structural Database, the world’s repository for small molecule crystal structures. The entry contains experimental data from a crystal diffraction study. The deposited dataset for this entry is freely available from the CCDC and typically includes 3D coordinates, cell parameters, space group, experimental conditions and quality measures.

10.5517/cc3qwb0

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