No abstract

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.

No abstract

Diquaternary salts of trans-l.2-di-(4-pyridyl)ethylene are reduced in aqueous solution by a one-electron transfer to give highly coloured radical cations which are more reactive than those derived from herbicidal bipyridylium salts. The salts of rrans-I .2-di-(4-pyridy1)ethylene are, for practical purposes, inactive a s herbicides.

No abstract