MeLi Reactions with the Electrophile System of (η5-C5H5)Fe(CO)2I/P(OMe)3: The Roles of MeLi as Reductant, Nucleophile, and Base
摘要:
The three roles of MeLi-nucleophile, base and reductant-could be revealed by the electrophile system of (eta(5)-C5H5)Fe(CO)(2)I (1) and P(OMe)(3). The addition of MeLi dropwise without delay to the 1:1 mixture results in (eta(4)-exo-MeC5H5)Fe(CO)(2)P(OMe)(3) (3), where MeLi is a reductant at the first stage and then a nucleophile at the second stage. On the other hand, the addition of a catalytic amount of MeLi to the mixture of 1 and excess P(OMe)(3), followed by the MeLi/MeI sequence after a delay time, results in the formation of [eta(5)-C5H4-{P(O)(OMe)(2))}]-Fe(CO) {P(OMe)(3)}Me (7), where MeLi is a reductant at the initial stage and a base at the latter stage.