Synthesis of cationic molybdenum and cobalt diene complexes from neutral allyl compounds by ligand exchange in a strong protic acid

Conclusions The allyl ligand in neutral molybdenum and cobalt complexes is readily exchanged by dienes in the presence of a strong protic acid with the formation of cationic complexes. This exchange is facilitated by an increase in the basicity of the starting compounds.Translated from Izvestiya Akademii Nauk SSSR, Seriya Khimicheskaya, No. 7, pp. 1655–1657, July, 1987.     

Synthesis and spectral study of chelate alkenylarenedicarbonyl complexes of Cr,Mo and W

Irradiation of alkenylarene tricarbonyl-chromium, -molybdenum, and -tungsten compounds in which the double bond is separated from the arene moiety by a two- or three-atom bridge results in intramolecular cyclization to give stable chelate alkenylarenedicarbonylmetal complexes. Chelate complexes containing four-atom bridges have low stabilities, and those with monoatomic bridges were not formed at all. Irradiation of styrenetricarbonyl-chromium and -molybdenum leads to dinuclear tricarbonylmetal—dicarbonylmetal complexes. The chelate complexes obtained have been studied by IR, proton NMR, and ¹³C NMR spectroscopy. The electron density distributions and the stereochemistry of the complexes are discussed. With nonsymmetric arenes, diastereoisomers are formed; the predominant isomers have been isolated in the pure form. According to the proton NMR data the double bond in alkenylarenechromium chelates is parallel of nearly parallel to the arene ring plane.     

Nucleophilic substitution reactions in chromium arene phosphite dicarbonyl chelate complexes

Conclusions An F atom and PhO group on a coordinated P atom in chromium arene phosphite dicarbonyl chelate complexes undergo nucleophilic substitution when treated with PhLi without ring opening to give the corresponding arene diphenylphosphinite chelates.Translated from Izvestiya Akademii Nauk SSSR, Seriya Khimicheskaya, No. 8, pp. 1900–1902, August, 1981.     

Protonation of Os3(μ-H)(CO)9(μ3-σ,η2-C≡C-R) clusters (R=CMe2OH,C(Me)=CH2)

Protonation of triosmium clusters Os₃(-H)(CO)₉(₃-,²-CC-R) (R=CMe₂OH, C(Me)=CH₂) affords a cationic complex containing a six-electron propargyl ligand which has been detected for the first time.Translated fromIzvestiya Akademii Nauk. Seriya Khimicheskaya, No. 6, pp. 1144–1145, June, 1993.     

Synthesis and some properties of a cationic manganese cyclopentadienylallyldicarbonyl complex

Conclusions A single-step synthesis was carried out for a cationic manganese cyclopentadienylallyldicarbonyl complex and the reactions of this complex with nucleophilic reagents were studied.Translated from Izvestiya Akademii Nauk SSSR, Seriya Khimicheskaya, No. 3, pp. 644–648, March, 1983.The authors express their gratitude to P. V. Petrovskii for taking the¹³C NMR spectrum and to A. S. Peregudov for taking the PMR spectra.     

Electrochemical substitution of a carbonyl group by a phosphorus ligand in arenechromium tricarbonyl complexes

Electrochemical oxidation of (η-1,3,5-Me₃C₆H₃)Cr(CO)₃ in the presence of P(OEt)₃ with subsequent electrochemical reduction results in the formation of a (η-1,3,5-Me₃C₆H₃)Cr(CO)₂[P(OEt)₃] and (η-1,3,5-Me₃C₆H₃)Cr(CO)[P(OEt)₃]₂ mixture. Under similar conditions (η⁶-arene)Cr(CO)₃, where arene = 3,5-Me₂C₆H₃(CH₂)₂OPR₂ (R = OEt,OPh,F), yields the corresponding arenephosphite chelate complexes.     

Triphenylphosphine complexes of benzyl- and vinylgold

Conclusions Triphenylphosphine complexes of benzyl- and vinylgold were obtained.Translated from Izvestiya Akademii Nauk SSSR, Seriya Khimicheskaya, No. 3, pp. 653–654, March, 1972.The authors thank A. A. Borisenko for obtaining the PMR spectra.