A Novel Use of the Anions of Fischer-type Carbene Complexes as Alkenyl Metallic Species

✍ Scribed by Kohei Fuchibe; Nobuharu Iwasawa

• Book ID: 104202632
• Publisher: Elsevier Science
• Year: 2000
• Tongue: French
• Weight: 175 KB
• Volume: 56
• Category: Article
• ISSN: 0040-4020
• DOI: 10.1016/s0040-4020(00)00205-2

✦ Synopsis

AbstractÐThe anions generated by deprotonation of Fischer-type carbene complexes or by 1,4-addition of lithium enolates to a,bunsaturated complexes are found to act as alkenyl metallic species on iodine oxidation. Various a-methoxy-a,b-unsaturated esters are formed by the treatment of such anions with iodine in the presence of methanol and silver tri¯uoromethanesulfonate. In addition, alkylcerium reagents are found to undergo 1,4-addition to a,b-unsaturated carbene complexes with high ef®ciency.