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Overlong CC Single Bonds

1997; Wiley; Volume: 36; Issue: 1-2 Linguagem: Inglês

10.1002/anie.199700481

1521-3773

Gerd Kaupp, Jürgen Boy,

Crystallography and molecular interactions

What is the maximum length of a single bond between carbon atoms? Certainly, this question cannot be answered by quantum mechanical calculations alone—reliably interpreted physical measurements on real molecules are crucial. The longest unequivocally determined CC single bonds (1.72 Å) have recently been found in tetraphenyldihydrocyclobutarenes 1 and 2.