Molyneux,R.J.; Wong,R.Y.
Tetrahedron, 1977 , vol. 33, p. 1931 - 1934
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Bradley; Robinson; Schwarzenbach
Journal of the Chemical Society, 1930 , p. 796,811
in pyridine dissolving (CrCl2(H2O)4)Cl*2H2O in pyridine, addn. of H2O;; pptn. treating product mixt. with HCl-soln. to dissolve (Cr(OH)2(H2O)2(C5H5N)2)Cl, dissolving residue in concd. HNO3-soln., pouring soln. in H2O, recrystn. of ppt. from pyridine;;