Abstract:
Sigma acceptor ligands play a crucial role in transition metal catalyzed lewis acid catalysis. The presence of such ligands around the transition metal center can significantly tune the nature of lewis acidity of the transition metal, leading to exceptional catalytic activity. There are some handful reports on group 14 elements for such ligands. In our work, we have utilized peri- substituted acenaphthene framework to prepare these ligands using group 15 element i.e. bismuth. Herein we have synthesized bismuth based neutral complexes (1, 5, 7) by employing one, two and three equivalents of 6-diphenylphosphinoacenaphth-5-yl and 6- diisopropylphosphinoacenaphth-5-yl ligands. Exploring the nature of these neutral complexes, chlorine atom abstraction from the bismuth center have been performed, resulting in generation of compounds 2, 3 and 6. These compounds have been investigated throughly using single crystal X-ray diffraction and NMR analysis. We have performed the reactions using these ligands and transition metal complexes and reported the possible formation of cu complex (4) of bismuth monocationic compound (3).
