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Formation of a Unique ansa ‐Metallocene Framework by Intramolecular Photochemical [2+2] Cycloaddition of Bis(2‐alkenylindenyl)zirconium Complexes
Author(s) -
Nie WanLi,
Erker Gerhard,
Kehr Gerald,
Fröhlich Roland
Publication year - 2004
Publication title -
angewandte chemie international edition
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 5.831
H-Index - 550
eISSN - 1521-3773
pISSN - 1433-7851
DOI - 10.1002/anie.200351886
Subject(s) - intramolecular force , cycloaddition , metallocene , chemistry , zirconium , phenylene , photodissociation , bent molecular geometry , ligand (biochemistry) , photochemistry , polymer chemistry , stereochemistry , organic chemistry , polymerization , catalysis , polymer , biochemistry , receptor
Complexes with backbone : Upon photolysis the title complexes undergo intramolecular [2+2] cycloaddition to yield unique cyclobutylene‐bridged ansa ‐zirconocenes. The annelated phenylene rings of the indenyl ligand lie directly above and below the σ ligands of the bent metallocene wedge (see picture). Ligands that are introduced inside the resulting “phenylene π‐electron box” display special chemical and spectroscopic features.