The acetylido iron hydride trans-[FeH(C≡CH)(depe)2] reacts with an excess of CO2 at ambient pressure and temperature to form a five-membered metalalactone cis-[Fe(OC(═O)CHCH-κ2C,O)(depe)2]. The reaction appears to proceed by electrophilic addition of CO2 to the β-carbon of the coordinated acetylide and cyclization to form the metalalactone product. At low temperature, a second molecule of CO2 is incorporated to give a carboxy-substituted metalalactone cis-[Fe(OC(═O)C(C(═O)OH)CH-κ2C,O)(depe)2]. When the initial metal acetylido hydride is substituted at the β-acetylenic carbon, the addition of CO2 results in a metalalactone where the substituent is in the position adjacent to the carbonyl in the metalalactone ring.
ASJC Scopus subject areas
- Physical and Theoretical Chemistry
- Organic Chemistry
- Inorganic Chemistry