254992-19-3Relevant academic research and scientific papers
Group 6 carbene complexes derived from lithiated azoles and the crystal structure of a molybdenum thiazolinylidene complex
Raubenheimer, Helgard G.,Stander, Yolanda,Marais, Eugene K.,Thompson, Catharine,Kruger, Gert J.,Cronje, Stephanie,Deetlefs, Maggel
, p. 158 - 168 (2007/10/03)
Fischer-type (alkoxy)azolyl carbene complexes and Oefele-Lappert-type azolylinylidene complexes were synthesised by reaction of 1-phenylpyrazol-3-yllithium, 4-methylthiazol-2-yllithium, benzothiazol-2-yllithium, 1-methylimidazol-2-yllithium with M(CO)5L (L=CO, THF or Cl-; M=Cr, Mo or W) and subsequent alkylation with CF3SO3CH3. The alkylation of Fischer-type carbene complexes containing an azolyl as the organic substituent proceeded via ring opening of tetrahydrofuran. When the alkylation is carried out in THF, the carbocation CH3O(CH2)4+ acts as an electrophile. Protonation rather than alkylation of coordinated imidazolyl furnished cyclic imine complexes. Changing the donor atom of a coordinated thiazole from N to C by deprotonation and alkylation afforded a carbene complex.
