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Overlong CC Single Bonds by Prof. Dr. Gerd Kaupp; Dipl.-Chem. Jürgen Boy is a Chemistry article available to read on EtoBox.

What is Overlong CC Single Bonds about?

Covalent C-C single bonds are typically 1.54 A long. This fact has been confirmed over and over again by X-ray crystal structure analyses (Cambridge Database, Ian Castleden) and other techniques. Larger deviations from the standard value are observed only in structures having exceptional ring strain, steric congestion, or electronic peculiarities. Numerous efforts have been directed at finding very long C-C single bonds. Thus, semiempirical calculations of the polycycle 1['1 predicted a particularly long diphenyl-substituted bond (PM3 1.642 8,; MNDO 1.652 A); however, it did not appear worthwhile to conduct an X-ray structure analysis, as much longer C-C single bonds had already been described. A presumed world record was the length of the central bonds in the photoisomer 2 of [2.2]tetrabenzoparacyclophane 3, which was determined by an X-ray analysis and reported by Ehrenberg as 1.77 8,.['] However, in this study no evident means of avoiding the thermal reaction leading to the golden yellow isomer 3 were taken.[Ib. 'I 2 3 Ar,C-CAr, 4

Who reads Overlong CC Single Bonds?

Author

Prof. Dr. Gerd Kaupp; Dipl.-Chem. Jürgen Boy

Publisher

John Wiley and Sons; Wiley (John Wiley & Sons); John Wiley & Sons Ltd.; Wiley; Research Square (ISSN 0044-8249)

Published

1997

Language

EN

Field

Chemistry (Physical Sciences)