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Chemical constitution and activity of bipyridylium herbicides: IV. —Diquaternary salts of methyl substituted 1,10‐phenanthrolines
Author(s) -
Dickeson J. E.,
Summers L. A.
Publication year - 1969
Publication title -
journal of the science of food and agriculture
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.782
H-Index - 142
eISSN - 1097-0010
pISSN - 0022-5142
DOI - 10.1002/jsfa.2740200203
Subject(s) - chemistry , aqueous solution , acre , medicinal chemistry , organic chemistry , inorganic chemistry , agronomy , biology
Eight bridged diquaternary salts of methyl substituted 1,10‐phenanthrolines have been prepared. They are reduced in aqueous solution to radical cations at about the same potential as diquat by a one electron transfer which is largely reversed by air. in herbicidal tests they showed slight activity at a rate equivalent to 8 lb/acre. Their relatively poor phytotoxic properties are considered to be due to their large size which hinders their reaching the site of biological action of the bipyridylium herbicides.