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1,3,5,7‐Tetra‐ tert ‐butyl‐4‐aza‐ and 1,3,5,7‐Tetra‐ tert ‐butyl‐4‐phospha‐ s ‐indacene
Author(s) -
Schardt Stefan,
Hafner Klaus,
Balaban Teodor Silviu,
Sturm Volker
Publication year - 1995
Publication title -
angewandte chemie international edition in english
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 5.831
H-Index - 550
eISSN - 1521-3773
pISSN - 0570-0833
DOI - 10.1002/anie.199503301
Subject(s) - tetra , antiaromaticity , electron delocalization , delocalized electron , chemistry , computational chemistry , medicinal chemistry , organic chemistry , molecule , aromaticity
s ‐Indacenes reveal the limits of the Hückel rules : These 12π systems are formally antiaromatic, but the results of more recent quantum mechanical calculations indicate π‐electron delocalization. The synthesis and spectroscopic investigation of the non‐electronically stabilized 4‐hetero‐ s ‐indacenes 1 and 2 have now been achieved for the first time.