Electrochemical study of methylfulvalene and methylcyclopentadiene molybdenum complexes
摘要:
The product of the synthesis of (eta(5):eta(5)-(C5H3Me)(2))Mo-2(CO)(6) (1) is reported as a mixture of six stereoisomers, the ratio of which has been unambigously assigned using homonuclear two dimensional correlation spectroscopy (COSY and NOESY). The reaction of Li-2[(eta(5):eta(5)-(C5H3Me)(2))Mo-2(CO)(6)] (2) with IMe yields (eta(5):eta(5)-(C5H3Me)(2))Mo-2(CO)(6)Me-2 (3) and that of 1 with I-2 yields (eta(5):eta(5)-(C5H3Me)(2))Mo-2(CO)(6)I-2 (4). The electrochemical behaviour of 1, 3, and 4 is reported and compared with analogous complexes where other substituents are present on the fulvalene rings. Electronic communication through the fulvalene ligand seems to take place in 4. The related compounds [(eta(5)-C5H4R)Mo(CO)(3)](2) (R = Me (5), H (9)), (eta(5)-C5H4R)Mo(CO)(3)Me (R = Me (7), H (10)) and (eta(5)-C5H4R)Mo(CO)(3)I (R = Me (8), H (11)) have been synthesized in order to compare their electrochemical behaviour with the fulvalene analogous. (C) 1998 Elsevier Science S.A. All rights reserved.