STUDIES ON COÖRDINATION COMPOUNDS. XIX. FORMATION CONSTANTS OF SOME METAL DERIVATIVES OF β,δ-TRIKETONES1,2

1960 ◽  
Vol 64 (12) ◽  
pp. 1927-1927 ◽  
Author(s):  
Hidehiko Kido ◽  
W. Conard Fernelius
2012 ◽  
Vol 65 (10) ◽  
pp. 1750-1764 ◽  
Author(s):  
Tarlok S. Lobana ◽  
Poonam Kumari ◽  
Ishveen Kaur ◽  
Nirandeep Kaur ◽  
Ginni Garg ◽  
...  

1972 ◽  
Vol 38 (1) ◽  
pp. 121-124 ◽  
Author(s):  
R.B. King ◽  
A. Efraty ◽  
W.C. Zipperer

1997 ◽  
Vol 75 (5) ◽  
pp. 499-506 ◽  
Author(s):  
E.H. De Oliveira ◽  
G.E.A. Medeiros ◽  
C. Peppe ◽  
Martyn A. Brown ◽  
Dennis G. Tuck

The electrochemical oxidation of a sacrificial metal anode (M = Zn, Cd, Cu) in an acetonitrile solution of 2-hydroxy-3-(3-methyl-2-butenyl)-1,4-naphthoquinone, lapachol, C15H14O3 (=HL) gives ML2. The results are in keeping with earlier work on direct electrochemical synthesis in related systems. Adducts with 2,2′-bipyridine (bpy) and N,N,N′,N′-tetramethylethanediamine (tmen) have also been prepared. The structure of the 2,2′-bipyridine adduct of Cu(lapacholate)2 has been established by X-ray crystallography. The parameters are triclinic, space group [Formula: see text], a = 12.748(59) Å, b = 13.859(49) Å, c = 11.770(59) Å, α = 108.30(4)°, β = 108.08(3)°, γ = 68.94(3)°, Z = 2, R = 0.059 for 2256 unique reflections. The copper atom is in a distorted CuN2O2O2′ environment. The mechanism of the formation of this Cu(lapacholate)2 is discussed. Keywords: electrochemical synthesis, lapachol, X-ray crystallography, copper(II) complex.


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