Abstract
AbstractThe peri interaction of 1‐functionalized naphthalenes equipped with a triarylmethyl cation at the 8‐position has been studied because of the reversibility of the ring‐closing reaction, which was monitored closely by NMR spectroscopy in the case of the cyclic ammonium salt 5b. Carbocycle 4a and N‐heterocycle 5b did not exhibit any tendency for ring cleavage under various conditions, whereas the naphtho‐annulated furan 4c underwent reversible ring cleavage under strongly acidic conditions.(© Wiley‐VCH Verlag GmbH & Co. KGaA, 69451 Weinheim, Germany, 2008)
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