Bipyridyl compounds

During cyclization with acetylene, the chiral center is maintained. This reaction has recently been extended to the synthesis of bipyridyl compounds having optically active substituents (75PC1) and provides access to chiral ligands of potential interest in transition-metal-catalyzed asymmetric catalysis. 

Herbicides are chemicals used to destroy unwanted plants (terrestrial or aquatic) called weeds. Herbicides fall into two broad categories inorganic (e.g., copper sulfate, sodium chlorate, and sodium arsenite) and organic (e.g., chlorophenoxy compounds, dinitrophenols, bipyridyl compounds, carbamates, and amide herbicides). Historically, inorganic compounds were the first available and the first used. There has been over a long period a continuous effort to develop herbicide compounds that are more selective—that affect weeds, as opposed to desirable plants. 

Adams, C.J., Bowen, L.E., Humphrey, M.G., Morrall, J.P.L., Samoc, M., Yellowlees, L.J. Ruthenium bipyridyl compounds with two terminal alkynyl hgands. Dalton Trans. 4130-4138 (2004)... 

L. Kavan and M. Gratzel, Nafion modified Ti02 electrodes Photoresponse and sensitization by Ru(II)-bipyridyl compounds, Electrochim. Acta, 1989, 34, 1327— 1334. 

The C2-symmetric homochiral pyrrolidine 424 has been prepared in several steps from L-mannono-1,4-lactone via L-mannitoI (for the enantiomer of 424 see Vol.25, Chapter 14, ref. 108). Another interesting C2-symmetric ligand the bipyridyl compound 426 was prepared from diacetone-D-glucose through oxidation and then diastereoselective addition of 2-bromo-6-lithiopyridine to give 425 followed by nickel dichloride/Zn-catalysed coupling. ... 

Grammoxone is one of a family of herbicides based on quaternised bipyridyl compounds. 

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