Miscellaneous quinones

Recent advances in 1,4-benzoquinone chemistry

“…They are widely distributed in the natural world, 2 being found in bacteria, plants and arthropods and hence quinones are ubiquitous to living systems. Quinones play pivotal role in biological functions including oxidative phosphorylation and electron transfer.…”

“…[14][15][16][17][18][19][20] Coordination chemistry of quinones is also quite rich from the perspective of designing magnetic materials 21 and understanding photophysical properties. 22 The studies of quinonoid compounds have focused on a broad spectrum of topics viz occurrence in nature, 2 syntheses, 23 cycloaddition reactions, 24 photochemistry and pulse radiolysis, 1,25,26 computational chemistry, etc. 27 The copiousness of articles describing the aforementioned multi-functional aspects serves as a grand testimonial to the contemporary interest in quinone chemistry.…”

“…The discoveries of antibiotic and antitumor properties of several naturally occurring quinones have raised interest among scientists to explore their use as pharmaceuticals. 30,31 For instance, streptonigrin (STN) 32 (2) is a natural quinone with antitumor and antibiotic activity.…”

The rhinoceros beetleCyphonistes tuberculifronsQuedenfeldt 1884 attracted by quinones (Coleoptera Scarabaeidae Dynastinae): primary olfactory attraction of a saprophagous beetle by its source of food?

“…Hence, quinones are frequently formed in rotting fruit fallen to the ground. Moreover, in fruit of some species of at least six families occurring in the study region, various quinones were found even before rotting (THOMSON 1987(THOMSON , 1997; among them, but in a lower proportion, were simple substituted 1 ,4-benzoquinones [(11), (15)]. …”

“…Quinones are present in the wood, heartwood or stem bark of some species belonging to at least 18 families (LEISTNER 1985;THOMSON 1987THOMSON , 1997 present in the study area (POILECOT 1991). The molecular structure of these quinones is mostly much more complex than those tested.…”