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Synthesis of an ansa‐Zirconocene via a Novel S 4 ‐Symmetric Spirobis(silastannaindacene) Compound
Author(s) -
Hüttenhofer Mario,
Schaper Frank,
Brintzinger Hans H.
Publication year - 1998
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/(sici)1521-3773(19980904)37:16<2268::aid-anie2268>3.0.co;2-y
Subject(s) - stereoselectivity , ring (chemistry) , tin , derivative (finance) , chemistry , stereochemistry , silylation , cyclopentadienyl complex , medicinal chemistry , catalysis , organic chemistry , financial economics , economics
A stereoselective reaction of Sn(NMe 2 ) 4 with the silyl‐bridged bis(cyclopentadienyl) derivative 1 generates the novel spiro compound 2 , in which two C 2 ‐symmetric six‐membered rings of opposite configuration are joined at a tin center: One ring is R,R ‐, and the other S,S ‐configured. Subsequent reaction with two equivalents of ZrCl 4 affords, by stereoselective Sn/Zr exchange, exclusively the C 2 ‐symmetric isomer of the ansa‐zirconocene rac ‐ 3 .