Nickel catalyzed tellurium-zine exchange reactions. A new preparation of arylzinc reagents

✍ Scribed by Thomas Stüdemann; Vijay Gupta; Lars Engman; Paul Knochel

• Book ID: 104256227
• Publisher: Elsevier Science
• Year: 1997
• Tongue: French
• Weight: 276 KB
• Volume: 38
• Category: Article
• ISSN: 0040-4039
• DOI: 10.1016/s0040-4039(96)02482-3

✦ Synopsis

Diaryltellurides 2 and diarylditellurides 3 undergo a smooth tellurium-zinc exchange reaction in the presence of catalytic amounts of Ni(acac)2 (5-10 mmol %) leading to arylzinc derivatives 1. The reaction can be extended to the preparation of alkylzinc compounds and allows a stereoselective cyclization to a 2,4-disubstituted tetrahydrofuran by a radical ring closure of an unsaturated telluride.