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Scheldt et al.bridging carbonyl ligands is observed. This aspect is being investigated further.It is anticipated that the study of "A-frame" complexes and their chemistries with small unsaturated molecules will, in addition to yielding a great deal of interesting and varied chemistry, be of tremendous value in furthering the understanding of catalytic processes involving multicentered metal catalysts.

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CH2CMe3)CI3 is treated with 2 mol of LICH2CMe3 in pentane at -78 °C: 5(CHCMe3) 232 (Jch = 76 ± 2 Hz), r (CHCMe3) 6.25, r (CHAHBCMe3) 9.08, (CHAhfeCMe3) 9.25 (Jhahb = 14 Hz), (b) Ta(7js-C5Me5XCHPhXCH2Ph)CI is formed when Ta(CH2Ph)3CI2 is treated with LiC5Me5 in THF for 1 day: 6 (CHPh) 222 (JCh = 85 ± 2 Hz), r (CHPh) 6.71, (CHAHBPh) 7.66, (CHAhfePh) 7.82 (^aHb = 11 Hz). Ta(7/5-C5Me4EtXCHPh)(CH2Ph)CI forms similarly and has been analyzed.