Work

Unusual Rearrangement of a 1,8-Naphthalene Derivative

Year: 2025

Type: article

Abstract: The steric strain between nitro and carboxylic acid groups in an 8-nitro-1-naphthoic acid derivative is able to unexpectedly disrupt the aromaticity of the naphthalene core under mild reaction conditions. The addition of H 2 O to the aromatic ring of a highly strained naphtho oxazinium intermediate induces the fragmentation of a Csp 2 –Csp 2 bond, with a concomitant rearrangement to yield a conjugated aldehyde. Key intermediates have been characterized, and the X-ray structure of the derivative has been obtained. Density functional theory (DFT) studies were performed to confirm the proposed mechanism.

Source: The Journal of Organic Chemistry

DOI: 10.1021/acs.joc.5c00021