Biuret And Related Compounds

Coordinatively and Electronically Unsaturated Pentamethylcyclopentadienyliridium(III) Complexes with the Dianions of Biuret, of the Diamide of Malonic Acid and of anN-Acetyldipeptide Ester

“…CCDC-180880 (1) and CCDC-181126 (3) contain the supplementary crystallographic data for this paper. These data can be obtained free of charge at www.ccdc.cam.ac.uk/conts/retrieving.html [or (1)ϪN (2) 80.0(2) Ir(1)ϪN (2) 198. 3(2) C(1)ϪN (1)ϪIr (1) 115.7(4) N(1)ϪC (1) 146.…”

“…The long and interesting history of biuret was reviewed by Kurzer in 1956. [2] The copper(II) complex of biuret was one of the first complexes of all, [3] and the biuret reaction, the formation of a red-violet copper compound with peptides was discovered even earlier in 1833.…”

“…[2] The copper(II) complex of biuret was one of the first complexes of all, [3] and the biuret reaction, the formation of a red-violet copper compound with peptides was discovered even earlier in 1833. [4] Schiff [5] found later that the diamides of malonic acid and of oxalic acid form similar copper(II) complexes as with biuret, and the pioneers in coordination chemistry Tschugaeff [6] and Pfeiffer [7] proposed correct formulas for the biuret copper(II) chelate and analogous complexes, the structures of which were later confirmed by the X-ray diffraction studies of Freeman et al [8] Other chelate complexes with the dianion of biuret, including Cu III and Ni III complexes, have also been reported.…”

Study of Dehydrocoupling Reactions of Diorganotin Dihydrides R1R2SnH2 with Biuret

“…Tetramethyltin, tetraethyltin, tetrabutyltin, phenyltin trichloride, trimethyltin chloride and butyltin trichloride (Aldrich) were used as such. Phenylmethyltin dichloride, phenylethyltin dichloride, phenylbutyltin dichloride, butylmethyltin dichloride 15 and biuret 16 were prepared as reported in literature. Phenylmethyltin dihydride (PhMeSnH 2 ), phenylethyltin dihydride (PhEtSnH 2 ), phenylbutyltin dihydride (PhBuSnH 2 ) and butylmethyltin dihydride (BuMeSnH 2 ) were prepared from the corresponding chlorides by reaction with LiAlH 4 in accordance with the literature method.…”

Iron(II) and iron(III) complexes of 2,4-dithiobiuret

“…2,4-Dithiobiuret (H2NCSNHCSNH2)(Dtb), a higher homologue of thiourea, is the parent of a large and interesting class of organic compounds (1).…”