A synthetic, structural and reactivity study of [(η4-C4R4)Co(η5-C5H4X)] complexes, R=Me or Et; X=CHO, CHCHFc, CHCH(η5-C5H4)Co(η4-C4Ph4), CHC(CN)2: Unexpected formation of [(η5-cyclopentadienyl)(η4-3,4,5,6-tetraethyl-α-pyrone)cobalt]
作者:Paul O’Donohue、Sarah A. Brusey、Corey M. Seward、Yannick Ortin、Bevin C. Molloy、Helge Müller-Bunz、Anthony R. Manning、Michael J. McGlinchey
DOI:10.1016/j.jorganchem.2009.04.004
日期:2009.7
attempted direct synthesis of 5 by reaction of Na[C5H5] and ethyl formate with [(η4-C4Et4)Co(CO)2I], 1, instead yielded [(η5-C5H5)Co(η4-3,4,5,6-tetraethyl-α-pyrone)], 18, and a mechanistic proposal is advanced. The X-ray crystal structures of 1, 7, 8, 11(Z), 15 and 18, and also the isocobaltocenium salts [(η4-C4Et4)Co(η6-C6H5Me)][PF6], 2, and [(η4-C4Et4)Co(η6-1,3,5-C6H3Me3)][PF6], 4, are reported.
的四乙基和四
甲基环丁二烯配合物[(η 4 -C 4 - [R 4)的Co(η 5 -C 5 H ^ 4 CHO)] R =的Et,5,R = Me中,7,和[(η 4 -C 4 [R 4)的Co(η 5 -C 5 H ^ 4 CO 2 Me)的R =的Et,6,R = Me中,8,可方便地通过相应的isocobaltocenium阳离子的光解[(η制备4 -C 4 - [R 4)有限公司(η 6 -C 6 H ^5 Me)] +在
乙腈中,然后用Na [C 5 H 4 CHO]或Na [C 5 H 4 CO 2 Me]处理。醛5和7经历与[FCCH和维悌希反应的Knoevenagel 2 PPH 3 ] I和CH 2(CN)2,以形成[(η 4 -C 4 - [R 4)的Co(η 5 -C 5 H ^ 4 CH = CHFC )]和[(η 4 -C 4 - [R 4)的Co(η 5 -C 5H