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Remote Rotamer Control: The Effect of a 4‐ tert ‐Butyl Group on the Coordination Chemistry of Tp R Ligands
Author(s) -
Rheingold Arnold L.,
LiableSands Louise M.,
Golan James A.,
Trofimenko Swiatoslaw
Publication year - 2003
Publication title -
european journal of inorganic chemistry
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.667
H-Index - 136
eISSN - 1099-0682
pISSN - 1434-1948
DOI - 10.1002/ejic.200300005
Subject(s) - chemistry , ligand (biochemistry) , coordination complex , boron , stereochemistry , medicinal chemistry , receptor , metal , organic chemistry , biochemistry
Abstract Three novel homoscorpionate ligands containing a tert ‐butyl group in the 4‐position have been synthesized: hydrotris(4‐ tert ‐butylpyrazol‐1‐yl)borate (Tp 4 t Bu ), hydrotris(4‐ tert ‐butyl‐3‐ p ‐tolylpyrazol‐1‐yl)borate (Tp Tol,4 t Bu ), and hydrotris(4‐ tert ‐butyl‐3‐isopropylpyrazol‐1‐yl)borate (Tp i Pr,4 t Bu ). The 4‐ tert ‐butyl group does not alter the coordination chemistry of the first two ligands, relative to their 4‐H analogues, however, the coordination chemistry of the third ligand is dramatically changed, making it a “tetrahedral enforcer”. The complexes Co[Tp 4 t Bu ][Tp Np ] ( 1 ), Tl[Tp Tol,4 t Bu ] ( 2 ), Rh[Tp Tol,4 t Bu ](CO) 2 ( 3 ), Co[Tp i Pr,4 t Bu ]Cl ( 4 ), Co[Tp i Pr,4 t Bu ]N 3 ( 5 ) and Co[Tp i Pr,4 t Bu ]NCS ( 6 ) have been structurally characterized. (© Wiley‐VCH Verlag GmbH & Co. KGaA, 69451 Weinheim, Germany, 2003)