PHOTOINDUCED REACTIONS OF CR(CO)3-COORDINATED 1,3,5-CYCLOHEPTATRIENE - (6+2) CYCLOADDITION WITH AN ALKYNE AND CATALYTIC 1,6-HYDROGENATION


FISCHLER I., GREVELS F., LEITICH J., OZKAR S.

CHEMISCHE BERICHTE-RECUEIL, cilt.124, ss.2857-2861, 1991 (SCI İndekslerine Giren Dergi) identifier identifier

  • Cilt numarası: 124 Konu: 12
  • Basım Tarihi: 1991
  • Doi Numarası: 10.1002/cber.19911241229
  • Dergi Adı: CHEMISCHE BERICHTE-RECUEIL
  • Sayfa Sayıları: ss.2857-2861

Özet

Irradiation of Cr(CO)3(eta(6)-1,3,5-cycloheptatriene) (1) in the presence of bis(trimethylsilyl)ethyne results in [6 + 2] cycloaddition of the alkyne to the cycloheptatriene ligand, yielding Cr(CO)3{eta(4:2)-7,8-bis(trimethylsilyl)bicyclo[4.2.1]nona-2,4,7-triene} (2, 60% yield, PHI = 0.08), which upon oxidative decomposition with Ce(IV) releases the organic cycloadduct, 7,8-bis-(trimethylsilyl)bicyclo[4.2.1]-nona-2,4,7-triene (3). Photocatalytic hydrogenation of 1,3,5-cycloheptatriene in the presence of complex 1 affords 1,3-cycloheptadiene. This process involves 1,6-addition of hydrogen, as demonstrated by using D2.