
TY  - JOUR
A1  - Schmalzl, K 
A1  - Summers, L 
T1  - Chemical Constitution and Activity of Bipyridylium Herbicides. XII. Diquaternary Salts of 6-Methyl-2,2'-bipyridyl and 2-Methyl-4,4'-bipyridyl
JF  - Australian Journal of Chemistry
JO  - Aust. J. Chem.
Y1  - 1977
VL  - 30
IS  - 3
SP  - 657
EP  - 662
KW  - 
UR  - https://doi.org/10.1071/CH9770657 
N2  - 6-Methyl- and 6-ethyl-2,2?-bipyridyl and 2-methyl-4,4?-bipyridyl have been prepared by reaction of the appropriate alkyllithiums with 2,2?- and 4,4?-bipyridyl. The alkylbipyridyls have been converted into diquaternary salts related to the herbicides diquat and paraquat. Two of the salts, 4-methyl-6,7-dihydrodipyrido[1,2-a:2?,1?-c]pyrazinediium dibromide and 1,1?,2-trimethyl-4,4?-bipyridinediiumdibromide, are about as active as post-emergent herbicides as diquat and paraquat. 
ER  -

