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Preparation of SNS CobaltII Pincer Model Complexes of Liver Alcohol Dehydrogenase
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核友性T形 (LXL) Au (I) -Pincer复合物:质子化和化

George Kleinhans1, Max M Hansmann2, Gregorio Guisado-Barrios3

  • 1Chemistry Department, University of Pretoria , Private Bag X20, Hatfield 0028, Pretoria, South Africa.

Journal of the American Chemical Society
|December 15, 2016
PubMed
概括

研究人员用碳素和半离子碳联体合成了新型T形金. 这些复合物与电友具有独特的反应性,形成一种不寻常的阴阳性黄金化物.

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Ketones with α protons are deprotonated by strong bases like lithium diisopropylamide (LDA) to form enolate ions. The anion is stabilized by resonance, and its hybrid structure exhibits negative charges on the carbonyl oxygen and the α carbon. This ambident nucleophile can attack an electrophile via two possible sites: the carbonyl oxygen, known as O-attack, or the α carbon, known as C-attack. The nucleophilic attack via the carbanionic site is preferred. This is due to the...
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Introduction
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The acidic strength of hydrocarbons follows the order: Alkynes > Alkenes > Alkanes. The strength of an acid is commonly expressed in units of pKa — the lower the pKa, the stronger the acid. Among the hydrocarbons, terminal alkynes have lower pKa values and are, therefore, more acidic. For example, the pKa values for ethane, ethene, and acetylene are 51, 44, and 25, respectively, as shown here.
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