Ruthenium(<scp>ii</scp>)-catalyzed C–H functionalizations on benzoic acids with aryl, alkenyl and alkynyl halides by weak-O-coordination
作者:Ruhuai Mei、Cuiju Zhu、Lutz Ackermann
DOI:10.1039/c6cc07773k
日期:——
C-H arylations of weakly coordinating benzoic acids were achieved by versatile ruthenium(II) catalysis with ample substrate scope. Thus, user-friendly ruthenium(II) biscarboxylate complexes modified with tricyclohexylphosphine enabled C-H functionalizations with aryl...
Tandem Aryne Sequence Route to the Synthesis of Substituted Fluorenones
作者:Perumal Rajakumar、Venghatraghavan Murali
DOI:10.1080/00397919508015488
日期:1995.11
Abstract Substituted m-terphenyl carboxylic acids of the type 1a–e were prepared by the tandem aryne sequence from substituted dihaloiodobenzenes with arylmagnesium bromide followed by quenching with CO2. The carboxylic acids 1a–e were converted into fluorenones 2a–e using either H2SO4 in CH3OH or PPA.
Carboxylate-Based Molybdenum Alkylidene Catalysts: Synthesis, Characterization, and Use as Initiators for 1,6-Heptadiyne Cyclopolymerizations
作者:Richard R. Schrock、Zachary J. Tonzetich、Alejandro G. Lichtscheidl、Peter Müller、Florian J. Schattenmann
DOI:10.1021/om800314y
日期:2008.8.1
The carboxylate species Mo(NR)(CHCMe2R')(O2CCPh3)2 (R = various aryl groups or 1-adamantyl; R' = Ph or Me) have been synthesized by salt metathesis between Mo(NR)(CHCMe2R')(OTf)2(DME) (OTf = trifluoromethanesulfonate; DME = 1,2-dimethoxyethane) and sodium triphenylacetate. Other carboxylate compounds that have been prepared by this route include Mo(NAr)(CHCMe2Ph)(O2CR")2 (Ar = 2,6-i-Pr2C6H3; R" = CPh2Me, Si(SiMe3)3) and Na[Mo(NAd)(CHCMe2Ph)(02CAr')31 (Ar' = 2,6Me2C6H3). Terpheny1carboxylate species Mo(NR)(CHCMe2Ph)(02CTer)2 (Ter = 2,6-diphenyl-4-methylphenyl or 2,6-diphenyl-4-methoxyphenyl) were prepared through protonolysis of Mo(NR)(CHCMe2R')(Me2Pyr)2 with TerC02H, and one of them was characterized through X-ray crystallography. Trimethylphosphine adducts of selected triphenylacetate complexes have been isolated, and the X-ray crystal structure of Mo(NAr")(CH-t-BU)(02CCPh3)2(PMe3) (Ar" = 2-t-BUC61-14) was obtained. Several of the triphenylacetate complexes are active initiators for the regioselective polymerization of diethyl dipropargy1malonate (DEPDM).
Chen, Chao-Tsen; Siegel, Jay S., Journal of the American Chemical Society, 1994, vol. 116, # 13, p. 5959 - 5960