peri-Interactions in Naphthalenes, 12 [1]. The Significance of Linear and T-Shaped Arrangements in peri-Substituted Naphthalenes

Abstract

Nearly linear alignment and T-shaped arrangements of peri-substituents at the naphthalene and anthracene systems are common features which cannot serve to infer hypercoordinate bonding.

1,8,9-Substituted anthracenes, intramolecular phosphine donor stabilized metaphosphonate and phosphenium

“…In a rather vigorous debate, doubts were expressed by Schiemenz over such interpretation of these experimental results. 8 Peri-substituted naphthalenes and anthracenes were also used as a scaffold for multicenter interactions, such as 5c-6e, 9 4c-6e 10 and 3c-4e 11 bonds. Such interactions result in linear alignment of the atoms involved; structural observations in the crystal were further supported by electronic state calculations.…”

The Unique Role of Halogen Substituents in the Design of Modern Crop Protection Compounds

“…Furthermore, the stronger CaF bonds, compared with other C-halogen bonds such as the CaCl, are the actual thermodynamic driving force for ''Halex reactions'' towards the ''fluoroaromatics'' [57]. The Halex reaction is a nucleophilic aromatic substitution (S N Ar) in which chlorine atoms activated by an electronwithdrawing group are displaced by fluorine upon reaction with a metal fluoride under polar aprotic conditions [58].…”

“…Most important halogenated triazole fungicides(56)(57)(58)(59)(60)(61). Spray application; Erysiphe spp., Septoria and Puccinia spp.…”