Quinones
represent an important class of naturally occurring compounds that are present
in flowering plants, bacteria and fungi, primarily as essential components of
the electron-transport chains involved in photosynthesis and cellular
respiration.
There are various
kinds of biological activities such as antineoplastic, antimalarial, antitumor,
anticoagulant, herbicidal and antibiotic attributable to this group of
compounds including their derivatives.
Synthetic or
natural quinoid compounds such as 1, 4-benzoquinone and 1, 4-naphthoquinone
have been used as dyes. Some quinones are widely applied in the fields of
photochemistry, co-ordination chemistry and synthetic chemistry.
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