in press. (11) Huffman, J. C., private communication. (12) Isomerization of an azametallocyclopentene ring by a titanium metal atom mediated hydrogen shift between nitrogen and carbon has been reported; see: Cohen, S. A., Bercaw, J. E. Organometallics 1985E. Organometallics , 4, 1006 The comparable stability and interconvertability of cisand irans-butadiene ligands bound to Cp2Zr units has been well documented; see:
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