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Zinc Pyrazolylborate Complexes with Phenoxide and Alkoxide Ligands
Author(s) -
Walz Rainer,
Weis Karl,
Ruf Michael,
Vahrenkamp Heinrich
Publication year - 1997
Publication title -
chemische berichte
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.667
H-Index - 136
eISSN - 1099-0682
pISSN - 0009-2940
DOI - 10.1002/cber.19971300727
Subject(s) - chemistry , alkoxide , zinc , phenols , medicinal chemistry , hydroxymethyl , alcohol , benzyl alcohol , crystal structure , zinc hydroxide , stereochemistry , organic chemistry , catalysis
The zinc hydroxide complexes Tp*Zn‐OH of highly substituted pyrazolylborate ligands react with phenols, and alcohols, of sufficient acidity, in a condensation reaction with release of H 2 O. Starting with phenols the following were attached:phenolate, p ‐nitropehnolate, o ‐vanillinate, o ‐hydroxymethylphenolate, o , o ‐bis(hydroxymethyl) ‐ p ‐methylphenolate. Whilst aliphatic alcohols and benzyl alcohol did not react, their derivatives, with highly electronegative substituents could be incorporated. Thus, the arylmethoxides OCH 2 C 6 F 5 and OCH 2 C 6 H 4 NO 2 ‐ p , as well as the alkoxides OCH 2 CF 3 and OCH 2 CCl 3 , were attached. 2‐Mercaptoethanol was bound via its thiolate function. The crystal structures of Tp Cum,Me ZN‐OC 6 H 4 NO 2 ‐ p ,Tp Cum,Me ZN‐OCH 2 ‐C 6 F 5 , Tp Cum,Me ZN‐OCH 2 CF 3 , Tp Cum,Me ZN‐OCH 2 CCl 3 and Tp Cum,Me Zn‐SCH 2 CH 2 OH were determined.