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PubMed2001

Zinc cyanamide, Zn(CN2).

Single crystals of the title compound have been grown by annealing microcrystalline zinc cyanamide at 843 K in silver crucibles. Zn(CN(2)) crystallizes as colourless prisms. The crystal structure is composed of corner-linked ZnN(4/2) tetrahedra. Carbon and nitrogen form (CN(2))(2-) dumb-bells with the C atom on a twofold axis. Nitrogen is approximately trigonally planar, coordinated by two Zn atoms and one C atom.

Journal Article↗
PubMed2002

Novel quinazoline ring synthesis by cycloaddition of N-arylketenimines with N,N-disubstituted cyanamides.

The reaction of N-aryl-substituted ketenimines with N,N-disubstituted cyanamides or (MeS)2C=N-CN under high pressure afforded 4-(N,N-disubstituted amino) or 4-(MeS)2C=N-substituted quinazoline derivatives, respectively. These products were formed by [4+2] cycloaddition between the aza-diene moieties of the N-arylsubstituted ketenimines and cyano groups. A 4-(unsubstituted amino)quinazoline derivative was synthesized by hydrolysis of the latter product.

Amides↗
PubMed1985

Models of molecular evolution. 2. Stereospecificity of dipeptide syntheses by means of cyanamides and carbodiimides.

Acetyl, benzyloxycarbonyl and tosyl protected DL-alanine, DL-leucine, DL-methionine, DL-phenylalanine, and DL-valine were condensed with DL-amino acid methyl esters. Cyanamide, diethylcyanamide, diisopropyl carbodiimide, dicyclohexyl carbodiimide, and N-cyclohexyl-N'-(2-morpholino ethyl) carbodiimide-N''-methotosylate served as condensing reagents. Water, methanol, and dimethylformamide were used as reaction media. The stereochemical course of these dipeptide syntheses was elucidated by means of 13C-n.m.r. spectroscopy. The formation of L-L and D-D bonds (isotactic sequences) was favoured in ca. 80% of all condensations. L-L/L-D (D-D/D-L) ratios of up to 6:1 were found.

Dipeptides↗