Synthesis and characterization of a trianionic pincer supported Mo-alkylidene anion and alkyne insertion into a Mo(IV)-C bond to form metallocyclopropene(η2-vinyl) complexes

Synthesis and Characterization of a Molybdenum Alkylidyne Supported by a Trianionic OCO3– Pincer Ligand

“…10 Conspicuously absent from the diverse profile of reactions described above are trianionic pincer ligand supported molybdenum alkylidynes. 17 33−35 While the Schrock synthesis provides exclusive access to alkylidynes containing the neopentylidyne fragment, MoC t Bu, the reaction is not reliably scalable. 36 The low oxidation state protocol is scalable and generates Mo-alkylidynes containing aryl substituents on the alkylidyne.…”

Application of imidazolinium salts and N-heterocyclic olefins for the synthesis of anionic and neutral tungsten imido alkylidene complexes

“…With 227.04(16) pm and 240.05(16) pm the triflate-metal bonds are very dissimilar and weak. This is compounded by 19 F NMR, which displays a signal at À78.4 ppm, suggesting a weakly bound triflate in solution that is close in chemical shift to free triflate (see Table S2 for a comparison of (6), W(1)-Cl(2) 244.18 (6), N(1)-W(1)-C(19) 100.61(1), N(1)-W(1)-N(2) 93.24 (9), C(19)-W(1)-N(2) 104.16 (9), N(1)-W(1)-Cl(2) 98.3(2), C19(2)-W(1)-Cl(2) 97.01 (7), N(2)-W(1)-Cl(2) 155.30 (6), N(1)-W(1)-Cl(1) 150.37 (7), C(19)-W(1)-Cl(1) 109.02 (7), N(2)-W(1)-Cl(1) 79.51 (6), Cl(2)-W(1)-Cl(1) 81.68(2); co-solvent omitted for clarity. different alkylidene triflate complexes with regard to the chemical shift and bond length, ESI †).…”

“…While thwarting the attempts to introduce NHCs, this rather unexpected chlorotransfer offered access to anionic imido alkylidene complexes. Reports on such compounds are very rare and include only a limited number of examples, [9][10][11] 13 as described by Legzdins. So far, all these complexes have been solely used as intermediates for the synthesis of non-ionic compounds and no activity in olefin metathesis reactions of these complexes was reported.…”

Synthese von meta‐Terphenyl‐2,2′′‐diolen durch anodische C‐C‐Kreuzkupplungen

“…Besonders interessant sind OCO‐Pincerkomplexe, die strukturell auf meta ‐Terphenyl‐2,2′′‐diolen basieren. Als Metalle können Cr, Mo, W, Ti, Zr, Ta, Sm und Yb genutzt werden. Erfolgreiche Anwendungen der meta ‐Terphenyl‐2,2′′‐diole als Pincerliganden wurde bereits für Sauerstoff‐ und Stickstoffübertragungsreaktionen, Polymerisation von Acetylenen und Olefinen, Alkenisomerisation, Nitren‐ und Carbengruppenübertragungen, O 2 ‐ und C‐H‐Aktivierung, Disulfidreduktionen und aerobe Oxidationen nachgewiesen.…”