Thionitrosyl Complexes, Nit rosy 1 Chromium Complexes A nitromethane solution of NS+PFe-, obtained in situ from N3S3CI3 and AgPF6 (1:3), reacts with benzene tricarbonyl chromium in acetonitrile solution to give the thionitrosylcontaining salt [Cr(NS)(NC-Me)s](PF6)2 (1)In the presence of Zerf-butyl isocyanide and Zn powder, 1 is reduced to [Cr(NS)(CN-CMe3)s]PF6 (3), while subsequent oxidation of...

Diastereoselective Ugi reactions of DMAP-based aldehydes with α-amino acids and tert-butyl isocyanide were examined. The reactions of 4-(dimethylamino)-2-pyridinecarboxaldehyde with various α-amino acids afforded 2-substituted DMAP derivatives with low diastereoselectivity. On the contrary, reactions with 4-(dimethylamino)-3-pyridinecarboxaldehyde delivered 3-substituted DMAP derivatives with m...

The palladium(II) complexes trans-[PdCl(L)(PPh3)2]Cl, 5, and cis-[PdI2(L)PPh3], 7, (L = benzoxazol-2-ylidene) have been synthesized by treatment of the complexes trans-[PdX2(PPh3)2] (4: X = Cl, 6: X = I) with 2-(trimethylsiloxy)phenyl isocyanide 1, and subsequent hydrolysis of the Si-O bond. The crystal structures of 5 and 7∗CH2Cl2 were established by X-ray diffraction. NMR and IR studies indic...

The spirocyclic motif is present in natural products, chiral ligands, and compounds of pharmacological interest. Isothiocyanates as well isocyanides bearing electron-withdrawing groups the ?-position can be deprotonated react formal dipoles on account presence a nucleophilic carbanion an electrophilic atom isothiocyanate or isocyanide functional groups. In last years number procedures involving...

Equilibrium constants for the binding of ethyl (EIC), n-butyl (BIC), p-toluenesulphonylmethyl (TMIC) and 2,6-dimethylphenyl isocyanides (DIMPI) to an imidazole-haem complex in toluene and aqueous detergent micelle solutions were determined. In contrast to an earlier study, which indicated that the large affinities of myoglobin for binding DIMPI and 2,6-diethylphenylisocyanide (DEPI) relative to...