Synthesis and chemistry of 2-oxacyclocarbene and 2-cyclovinyl ether ligands supported by the [{MeC(CH2PPh2)3}Re(CO)2]+ auxiliary

The rhenium(I) cyclovinyl ether complexes [(triphos)Re(CO)2{CCHCH2(CH2)nO}]BF4 [triphos=MeC(CH2PPh2)3; n=1, 2] have been synthesized through the reversible and regioselective deprotonation of the corresponding 2-oxacyclocarbene complexes [(triphos)Re(CO)2{CCH2CH2(CH2)nCH2O}]BF4 (n=1, 2). The structure of the octahedral 2-oxacyclohexylidene complex [(triphos)Re(CO)2(CCH2CH2CH2CH2O)]BF4 has been determined by a single-crystal X-ray diffraction analysis.