1339960-36-9Relevant academic research and scientific papers
Reactivity of bis(pyrazol-1-yl)methanes functionalized by 2-hydroxyphenyl and 2-methoxyphenyl on the methine carbon atom with W(CO)5THF
Ding, Ke,Cheng, Cai-Hong,Yang, Yan-Xin,Song, Hai-Bin,Tang, Liang-Fu
, p. 3662 - 3667 (2011/11/29)
Reactions of 2-hydroxyphenyl and 2-methoxyphenylbis(pyrazol-1-yl)methanes as well as 2-hydroxyphenyl and 2-methoxyphenylbis(3,5-dimethylpyrazol-1-yl) methanes with W(CO)5THF have been carried out. Heating 2-hydroxyphenylbis(pyrazol-1-yl)methane (L1) with W(CO) 5THF in THF at reflux yielded complex (L1)W(CO) 4.L1, while similar reaction of 2-hydroxyphenylbis(3,5- dimethylpyrazol-1-yl)methane (L2) with W(CO)5THF resulted in the cleavage of a Csp3-N bond to generate 1,2-bis(2-hydroxyphenyl) -1,2-bis(3,5-dimethylpyrazol-1-yl)ethane (L) and pyrazole derivative W(CO) 5(3,5-Me2PzH) (Pz = pyrazol-1-yl). These two fragments were connected together through strong O...H-N and O-H...N hydrogen bonds to form complex L.[W(CO)5(3,5-Me2PzH)]2. The analogous results were observed in the treatment of 2-methoxyphenylbis(pyrazol- 1-yl)methane (L3) with W(CO)5THF, which gave product L′.[W(CO)5(PzH)]2 (L′ = 1,2-bis(2- methoxyphenyl)-1,2-bis(pyrazol-1-yl)ethane) as well as certain amount of complex (L3)W(CO)4. In addition, during the reaction of 2-methoxyphenylbis(3,5-dimethylpyrazol-1-yl)methane (L4) with W(CO)5THF, partial decomposition reactions took place to yield complexes (L4)W(CO)4 and W(CO)5(3,5-Me 2PzH), but no hydrogen bond was found between these two moieties.
