yields after careful layering with petroleum ether. The re- [a] Institut für Anorganische und Analytische Chemie der Unisulting zinc complexes belong to one of the three classes A,
(Pyrazolylborato)zinc−Aldehyde Complexes
✍ Scribed by Rainer Walz; Michael Ruf; Heinrich Vahrenkamp
- Publisher
- John Wiley and Sons
- Year
- 2001
- Tongue
- English
- Weight
- 274 KB
- Volume
- 2001
- Category
- Article
- ISSN
- 1434-1948
No coin nor oath required. For personal study only.
✦ Synopsis
The zinc hydroxide complex Tp Cum,Me Zn-OH [1, Tp Cum,Me = tris(3-cumenyl-5-methylpyrazolyl)borate] reacts with trichloroacetaldehyde and pentafluorobenzaldehyde to form the complexes Tp Cum,Me Zn-O(CHOH)R, containing the aldehyde ligands as the deprotonated aldehyde hydrates. 1 and 2-formylphenol, 2,6-diformylphenol and 2-formylthiophenol undergo condensation with the formation of the correspond-
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Zinc salts of low or zero water content were obtained from isolated and identified by crystal structure determinations. All contain octahedral zinc to which 2, 3, 4, 5, or 6 aldehyde the hexahydrates of zinc nitrate, zinc perchlorate, and zinc tetrafluoroborate by dehydration with triethoxymethane o
hyde in solution and on its removal by precipitation. How- [a] Institut für Anorganische und Analytische Chemie der Universiever, when the zinc halide and the aldehyde were dissolved tät Freiburg,
## Abstract The asymmetric alkynylation of aldehydes catalyzed by bifunctional Zn(salen) catalyst was realized. With a Kozlowski salen ligand (7e) bearing secondary basic 1‐piperidinylmethyl groups at C‐3 and C‐3′, the enhanced catalytic reactivity and stereoselectivity in comparison with that of n