Abstract
ADMET was evaluated as a method for preparing organometallic polymers with metal–metal bonds in the main chain. The Cp2Mo2CO4(Ph2P(CH2)6CH=CH2)2 complex was synthesized, and the X-ray crystal structure is reported. The molecule did not undergo ADMET polymerization with Grubbs’ or Schrock’s catalysts. In a control experiment to test if the Ph2P(CH2)6CH=CH2 ligand was interfering with the ADMET reaction, the phosphine was reacted with Grubbs’ 2nd generation catalyst. The dimerized metathesis product Ph2P(CH2)6CH=CH(CH2)6PPh2 was obtained with no observed degradation or deactivation of the catalyst. To test the inherent ADMET reactivity of the Ph2P(CH2)6CH=CH2 ligand when it is bonded to a metal center, the mononuclear cis-Mo(CO)4(Ph2P(CH2)6CH=CH2)2 complex was synthesized and polymerized using Grubbs’ 2nd generation catalyst. These control experiments suggest that the inability of Cp2Mo2CO4(Ph2P(CH2)6CH=CH2)2 to polymerize is not due to electronic effects pertaining to the C=C unit of the Ph2P(CH2)6CH=CH2 ligand. Accordingly, steric effects are implicated in the inability of the Cp2Mo2CO4(Ph2P(CH2)6CH=CH2)2 to polymerize by ADMET.
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