Reactions of Complex Ligands. Part 107 Densely Substituted Hydroquinoid Phenanthrene and Triphenylene Cr(CO)<sub>3</sub>Complexes: Chromium-Templated Synthesis and Molecular Structure
作者:Karl Heinz Dötz、Joachim Stendel、Martin Nieger
DOI:10.1002/zaac.200800399
日期:2009.2
(Fischer route). The benzannulation of the aryl carbene complexes (either with 3-hexyne / (t-butyl)dimethylsilyl chloride or with (t-butyl)dimethylsilylethyne) allowed the regiospecific synthesis of the oligocyclic hydroquinoid arene tricarbonyl chromium complexes 10–22 in 44–94 % yield thus providing a two-step synthesis with overall yields of 18 - 80 %. Under the kinetic reaction conditions used the
Diastereoselective Synthesis of Three-, Five-, Six-, and Seven-Membered Rings from Fischer Carbene Complexes and 4-Unsubstituted 1-Amino-1,3-Dienes
作者:Fernando Aznar、Martín Fañanás-Mastral、Jorge Alonso、Francisco J. Fañanás
DOI:10.1002/chem.200701109
日期:2008.1
Fischer carbene complexes react with 4-unsubstituted 1-amino-1,3-dienes to give different carbocyclization products depending on the nature of the carbene complex and on the substitution pattern of the aminodiene. Thus, the reaction of arylcarbene chromium complexes and 1-aminodienes diastereoselectively affords cyclopropane derivatives by means of a formal [2+1] carbocyclization reaction. In particular
yield bearing the chromium fragment coordinated to the terminal unsubstituted phenanthrene ring. The rearrangements have been monitored by IR and NMR spectroscopy. Kinetic NMR experiments in noncoordinating solvents such as hexafluorobenzene reveal first-order kinetics in line with an intramolecular metal shift along the extended π-system. The metal migration can be tuned by the P-based coligand as
Synthesis, Resolution, and Determination of Absolute Configuration of a Vaulted 2,2‘-Binaphthol and a Vaulted 3,3‘-Biphenanthrol (VAPOL)
作者:Jianming Bao、William D. Wulff、James B. Dominy、Michael J. Fumo、Eugene B. Grant、Alexander C. Rob、Mark C. Whitcomb、Siu-Man Yeung、Robert L. Ostrander、Arnold L. Rheingold
DOI:10.1021/ja952018t
日期:1996.1.1
thermolysis of phenylacetyl chloride in the presence of phenylacetylene or from the benzannulation of the pentacarbonyl(phenylmethoxymethylene)chromium(0) (15) with phenylacetylene which upon an acetylative workup gives O-acetyl-4-methoxy-2-phenyl-1-naphthol (16). The reductive cleavage of the acetoxy group in 16 was unexpectedly affected by aluminum chloride and ethanethiol which were used to cleave the methyl