947261-37-2Relevant academic research and scientific papers
Reactivity of the four-membered heterometallacycles CH(3,5-Me 2Pz)2(CO)3WSnAr3 (Pz = Pyrazol-1-yl) with P(OR)3: Unexpected P-O/C exchange reactions in phosphite
Zhang, Xiao-Yan,Hong, Juan,Song, Hai-Bin,Tang, Liang-Fu
, p. 4038 - 4041 (2007)
Reactions of CH(3,5-Me2Pz)2(CO)3WSnAr 3 (Pz = pyrazol-1-yl; Ar = phenyl, p-tolyl) with P(OR)3 (R = methyl, isopropyl) under solvent-free conditions give the decarbonylated complexes CH(3,5-Me2Pz)2-(CO)2(P(OR) 3)WSnAr3. However, treatment of CH(3,5-Me2 2Pz)2(CO)3WSnAr3 with P(OMe) 3 at elevated temperature results in unexpected P-O/C exchange reactions with the cleavage of the W-C bond to give the novel reductive elimination product (MeO)2PCH(3,5-Me2Pz) 2W(CO)3. Furthermore, even at low temperature, the reaction of CH(3,5-Me2Pz)2(CO)3WSnAr 3 with P(OAr)3 only yields the similar reductive elimination products (ArO)2PCH(3,5-Me2Pz) 2W(CO)2. In these novel tungsten(0) complexes, the newly formed diaryl or dialkyl bis(3,5-dimethylpyrazol-1-yl)methylphosphonite acts as a neutral tridentate κ3-[N,N,P] chelating ligand.
