Substituted anthracene derivatives. Part VIII. The conjugating powers of the substitution positions in 3 : 4-benzophenanthrene

Abstract

By G. M. BADGER and I. S. WALKER.

peri Interaction in Naphthalene Derivatives

“…This effect has been noted in other polynuclear aromatic systems. In addition to references made earlier to such systems, several other studies may be mentioned on phenanthrenes (14,46,310,431,443,476), benzo[cJphenanthrenes (49,76,303,446), and chrysenes (220,306). In 4,5-dimethylphenanthrene, for example, two groups of workers have independently reported (46,443) the loss of the fine structure in the long wavelength region, even though the essential characteristics of phenanthroid absorption persisted.…”

Photochemistry of stilbenes. VI. Steric effects on the photocyclizations of some m-substituted stilbenes

“…The product composition was shown by glc analysis to be 41 % 4-fluorophenanthrene (shorter retention time) and 59% 2-fluorophenanthrene (longer retention time). These two components were separated by chromatographyon alumina with petroleum ether (30)(31)(32)(33)(34)(35)(36)(37)(38)(39)(40) as eluent. The firsteluted material was recrystallized from methanol to give 4-fluorophenanthrene, mp 41.0-42.6°(lit.43 mp 47°).…”