... to Low-valent Transition Metal Complexes Hisao URATA, Mariko TANAKA, and Takamasa FUCHIKAMI* Sagami Chemical Research Center, Nishi-Ohnuma 4-4-1, Sagamihara, Kanagawa 229 cis-Oxidative adducts are isolated by the reaction of Pd(O) complexes or Pt(CH2=CH2)(PPh3)2 with 1,3-dialkyl-5- ... Chem. Lett., 1984, 1595. 3) T. Fuchikami, A. Yamanouchi, and Y. Suzuki, Chem. Lett., 1984, 1573. ...