Synthesis of Sterically Hindered Ortho-Substituted Tetraphenylethenes. Electronic Effects in the McMurry Olefination Reaction
作者:Mee-Kyung Chung、Guizhong Qi、Jeffrey M. Stryker
DOI:10.1021/ol060318h
日期:2006.3.1
[reaction: see text] Contrary to literature consensus, the McMurry olefination reaction can be extended to the direct synthesis of sterically encumbered tetrakis(2-substituted) tetraphenylethenes from the corresponding 2,2'-disubstitutedbenzophenones. The reaction exploits previously unrecognized substrate-based electronic effects that dominate over otherwise controlling steric considerations and
Selective Syntheses of Partially Etherified Derivatives of Tetrakis(2-hydroxyphenyl)ethene. An Alternative to the Calix[4]arene Ligand System
作者:Megumi Fujita、Guizhong Qi、Udo H. Verkerk、Trevor L. Dzwiniel、Robert McDonald、Jeffrey M. Stryker
DOI:10.1021/ol0491639
日期:2004.8.1
2'-benzophenone derivative and the latter by selective partial dealkylation of tetrakis(2-methoxyphenyl)ethene. Selective single demethylation has also been demonstrated in the 5-tert-butyl series. Thus, divalent and monovalent derivatives of the preorganized tetrakis(2-hydroxyphenyl)ethene ligand system are now available for use in coordination chemistry, analogous to corresponding calix[4]arene systems. [structure: