Stereoselective cyclopalladation of [{(N-methyl-N-aryl)amino}methyl]ferrocenes:Crystal structure of sigma-Pd[ClPPh_3(eta~5-C_5H_5)Fe(eta~5-C_5H_3CH_2N(CH_3)C_6H_4OCH_3-4)] centre dot H_2O

摘要

Stereoselective cyclopalladation of [(N-methyl-N-aryl)amino]methylferrocenes 1a-f (aryl=4-CH_3OC_6H_4(a),4-CH_3C_6H_4(b),C_6H_5(c),4-ClC_6H_4(d),3-ClC_6H_4(e),3-O_2NC_6H_4(f)) with sodium palladium tetrachloride and followed by treatment with triphenylphosphine resulted in the cyclopalladated complexes 3a-f (aryl=same as before) in the form of raceme.The structure of 3a was determined by X-ray single crystal diffraction.Complex 3a crystallizes in triclinic,space group P-1 with a=10.6685(14),b=10.7412(14),c=16.795(2) A,alpha=71.879(2),beta=85.798(2),gamma=64.523(2) deg.The possible mechanism for the formation of 3 was discussed.