1428203-69-3Relevant academic research and scientific papers
Crystal structure of 3) and unequivocal assignments of C(2,5) and C(3,4) on the cyclopentadienyl ring of cynichrodene, tricarbonyl(5- cyclopentadienyl)methylmolybdenum, tricarbonyl(5- cyclopentadienyl)methyltungsten, ferrocene, and dicarbonyl(5- cyclopentadienyl)cobalt derivatives
Wang, Yu-Pin,Tang, Wei-Der,Cheng, Hsiu-Yao,Lin, Tso-Shen
, p. 68 - 80 (2013)
Schiff's bases (η5-formylcyclopentadienyl) tricarbonylmethylmolybdenum 2,4-dinitrophenylhydrazone (6), (η5- acetylcyclopentadienyl)tricarbonylmethylmolybdenum 2,4-dinitrophenylhydrazone (7), and (η5-acetylcyclopentadienyl)tricarbonylmethylmolybdenum azine (8) were obtained from condensation reaction of (CO)3(CH 3)Mo(C5H4CHO) (3) or (CO)3(CH 3)Mo(C5H4COCH3) (4) with each of substituted-cyclopentadienyl Cp(M) derivatives - (CO)2(NO) M[η5-(C5H4COOCH3)] (1 M = Cr, 2 M = Mo), (CO)3(CH3)Mo[η5-(C 5H4-sub)] (3-5, 6, 7, 8) - have been assigned using compared with the NMR data of other organometallic Cp(M) analogs, (CO) 2(NO)CrCp, (CO)3(CH3)WCp, Cp2Fe, and (CO)2CoCp. We observed that C(3,4) resonate at a lower field than C(2,5) in (CO)3(CH3)Mo[η5-(C 5H4CHO)] 3 and 4, whereas C(2,5) resonate at a lower field than C(3,4) in (CO)3(CH3)Mo[η5-(C 5H4COOCH3)] 5. The correlation between the magnitudes of nonplanarity of Cp-exocyclic carbon to π-acceptor substituents and the extent of deshielding on the C(3,4) of the Cp ring was discussed. The electron density distribution in the cyclopentadienyl ring was discussed on the basis of 13C NMR data and those of 4, 7, and 8 were compared with calculations using the density functional B3LYP exchange-correlation method.
