Spectroscopy of unstable complexes of organometallic compounds with small molecules at low temperatures
作者:B.V. Lokshin、I.I. Greenwald
DOI:10.1016/0022-2860(90)80003-3
日期:1990.5
Abstract Using IR spectroscopy, evidence has been obtained that organometalliccompounds of transition metals (metallocenes, arenemetaltricarbonyls) and of non-transition elements (alkyl derivatives of II–V group elements) are capable of forming unstable complexes with small molecules (N 2 , O 2 , H 2 , CH 4 ), which can be stabilized at low temperatures. The structure determination of the complexes
Benzylic functionalization of (η6-alkylarene)chromium tricarbonyl complexes
作者:Valery N. Kalinin、Il'ya A. Cherepanov、Sergey K. Moiseev
DOI:10.1016/s0022-328x(96)06781-2
日期:1997.5
(η6-alkylarene)chromiumtricarbonylcomplexes on the action of lithium amides in THF under very mild conditions has been developed. Transmetallation reactions of the lithium derivatives thus obtained produce the corresponding benzylic organotin, zinc and copper chromiumtricarbonylcomplexes. Methods for the preparative benzylic functionalization of (η6-alkylarene)chromiumtricarbonylcomplexes have been
Synthesis of Polyarylated Methanes through Cross-Coupling of Tricarbonylchromium-Activated Benzyllithiums
作者:Genette I. McGrew、Jesada Temaismithi、Patrick J. Carroll、Patrick J. Walsh
DOI:10.1002/anie.201000957
日期:——
Coordinated to the tricarbonylchromium fragment, a typically unstable benzylic organolithium can participate directly in cross‐coupling reactions with aryl bromides to form polyarylated methane derivatives (see scheme). Cr(CO)3 assistance leads to reactivity with a variety of coordinated substrates and—given multiple benzylicsites—can effect up to six coupling events per arene.
The complexation of a Cr(CO)3 unit to an aromatic hydrocarbon enhances the benzylic position towerds attack by base and the resulting carbanion reacts with carbonyl compounds to produce a complexed alcohol; this reaction may be used to functionalize the benzylic position of an aromatic hydrocarbon.
Palladium-Catalyzed Allylic Substitution with (η<sup>6</sup>-Arene–CH<sub>2</sub>Z)Cr(CO)<sub>3</sub>-Based Nucleophiles
作者:Jiadi Zhang、Corneliu Stanciu、Beibei Wang、Mahmud M. Hussain、Chao-Shan Da、Patrick J. Carroll、Spencer D. Dreher、Patrick J. Walsh
DOI:10.1021/ja208935u
日期:2011.12.21
Although the palladium-catalyzed Tsuji-Trost allylic substitution reaction has been intensively studied, there is a lack of general methods to employ simple benzylic nucleophiles. Such a method would facilitate access to "α-2-propenyl benzyl" motifs, which are common structural motifs in bioactive compounds and natural products. We report herein the palladium-catalyzedallylationreaction of toluene-derived