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Competing Occurrence of Isomeric (Dialkyltartrato)zirconocene Dimers with Dimetallatricyclic and Ten‐Membered Dimetallamonocyclic Frameworks
Author(s) -
Erker Gerhard,
Rump Mathias,
Dehnicke Stefan,
Krüger Carl,
Werner Stefan,
Nolte Matthias
Publication year - 1991
Publication title -
angewandte chemie international edition in english
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 5.831
H-Index - 550
eISSN - 1521-3773
pISSN - 0570-0833
DOI - 10.1002/anie.199113491
Subject(s) - chemistry , stereochemistry , nuclear magnetic resonance spectroscopy , type (biology) , crystallography , simple (philosophy) , biology , philosophy , ecology , epistemology
Is the question of catalytically active species for Sharpless epoxidations again open? The results of NMR spectroscopy and X‐ray structural analysis on catalytically inactive (tartrato)zirconocene dimers show how complicated the situation can be. Simple stereochemical changes and variation of the substituents in the crystal and in solution result in these complexes forming either ten‐membered dimetallacycles (type A ) or dimetallatricycles (type B ). E = CO 2 CHMe 2 , CO 2 Me.