Metallkomplexe funktioneller Isocyanide, XVI¹⁾ 1,3‐Dipolare Cycloadditionen von Heteroallenen an die metallorganischen Nitrilylide [(OC)₅MCNCHR]⁻ (M = Cr, W; R = CO₂Et)

N-heterocyclic carbene complexes of Group 6 metals

“…M(0) carbonyl complexes containing homoleptic or heteroleptic substituted imidazol-2-ylidene ligands [73][74][75][76][77][78][79][80][81][82][83][84][85] or backbone functionalized imidazole based NHC ligands [86][87][88][89][90][91] have been studied extensively.…”

“…This type of M(0) NHC complexes is classified according to the heterocyclic backbones in the carbene ligands, such as imidazole [73][74][75][76][77][78][79][80][81][82][83][84][85][86][87][88][89][90][91], benzimidazole [80,[92][93][94][95][96][97][98][99] and other heterocyclic compounds based-NHC ligands [94,[100][101][102][103][104][105][106][107][108]. M a n u s c r i p t…”

X‐ray Structure of the Isodiazomethane Complex Cr(CO)5C≡N‐NH2and [3+2]‐Cycloadditions to the Metallo‐Nitrile‐Imine [Cr(CO)5C≡N‐NH]–[1]

“…Towards dimethyl acetylenedicarboxylate the deprotonated 1a reveals its chromio nitrile imine/1,3‐dipole nature B for the first time. The resulting beige C‐pyrazolato complex 8 presumably forms by a two step‐mechanism as postulated for metallo nitrile ylid chemistry 26, 27. In the same way further [3+2]‐cycloadditions have been carried out with trifluoroacetonitrile, carbon disulfide and phenyl isocyanate.…”

Fixation of Metallo Nitrile Ylides and Metallo Nitrile Imines as Ligands in Transition Metal Complexes [1]

“…General Remarks: All experiments were performed under argon in dried argon‐saturated solvents. [W(CO) 5 CNCH 2 PPh 3 ]PF 6 12, W(CO) 5 CNCH 2 SO 2 ‐ p ‐tolyl 9b, Cr(CO) 5 CNCH 2 Ph 9b, Cr(CO) 5 CNCH 2 CO 2 Et 25, W(CO) 5 CNCH 2 CO 2 Et 25, Cr(CO) 5 CNNH 2 [13, 48], [Re(CO) 6 ]PF 6 49, [FeCp(CO) 2 CS]PF 6 [50, 51], [FeCp(CO)(CNPh) 2 ]PF 6 51, and [FeCp(CNPh) 3 ]Cl [51, 52] were prepared according to literature procedures.…”