Patent ID: 8703756

Claim:
A synthetic process for manufacturing cis-LPtCl 2 complex wherein L is a 4,4′-substituted-2,2′-bipyridine compound comprising 2,2′-bipyridines having a group R selected from the group consisting of alkoxy groups appended in both the 4,4′-positions of the bipyridine, wherein a first reagent selected from the group consisting of 4,4′-bis[RO]-2,2′-bipyridine, where, R=—(CH 2 ) n CH 3 , —(CH 2 ) n OCH 3 , and —(CH 2 ) n [O(CH 2 ) m ] y O(CH 2 ) z CH 3 and where n=1, 2, 3, 4, 5, 6, 7, 8, 9 or 10; and m, y and z are independently 0-10 is dissolved in a solution with a second reagent comprising an alkali or alkaline salt of tetrachloro platinum, and the solution is refluxed to produce a precipitate comprising (4,4′-bis[RO]-2,2′-bipyridine)PtCl 2 where, R=—(CH 2 ) n CH 3 , —(CH 2 ) n OCH 3 , and —(CH 2 ) n [O(CH 2 ) m ] y O(CH 2 ) z CH 3 and where n=2, 3, 4 or 5 and m, y and z are independently 0-10.