To develop more active catalysts for the rhodium‐catalyzed addition of carboxylic acids to terminalalkynes furnishing anti‐Markovnikov Z enol esters, a thorough study of the rhodium complexes involved was performed. A number of rhodium complexes were characterized by NMR, ESI‐MS, and X‐ray analysis and applied as catalysts for the title reaction. The systematic investigations revealed that the presence
Rhodium-Catalyzed Selective <i>anti</i>-Markovnikov Addition of Carboxylic Acids to Alkynes
作者:Alexandre Lumbroso、Nicolas R. Vautravers、Bernhard Breit
DOI:10.1021/ol102365e
日期:2010.12.3
The selective intermolecular anti-Markovnikov addition of carboxylic acids to terminal alkynes yielding valuable Z-enol esters has been achieved for the first time under rhodium-catalyzed conditions. The catalyst system is applicable to a broad substrate scope and displays a wide functional group tolerance.
A dinuclear ruthenium catalyst with a confined cavity: selectivity in the addition of aliphatic carboxylic acids to phenylacetylene
作者:Kwong-Chak Cheung、Wing-Leung Wong、Ming-Him So、Zhong-Yuan Zhou、Siu-Cheong Yan、Kwok-Yin Wong
DOI:10.1039/c2cc38454j
日期:——
A dinuclear ruthenium catalyst with a rigid anthracene spacer shows excellent regio- and stereo-selectivity in the atom-economic addition of aliphatic carboxylic acids to phenylacetylene, producing exclusively anti-Markovnikov enol-esters with high E/Z ratios of the isomers.
The present invention pertains to a method which uses a compound represented by general formula (1) as a fragrance precursor, wherein the compound represented by general formula (1) is irradiated with light to release an unsaturated aldehyde or ketone represented by general formula (2). (In formulae (1) and (2), R1-R8 and wavy lines are each as defined in the description. R1 and R2, R1 and R3, R1 and R4, R1 and R5, R3 and R4, or R3 and R5 may form a ring.)
Water-soluble and reusable copper catalyst for the allylic benzoyloxylation of olefins
作者:Jean Le Bras、Jacques Muzart
DOI:10.1016/s0040-4039(01)02170-0
日期:2002.1
Simple mixing of [(HOCH(2)CH(2)NHCOCH(2))(2)NCH(2)](2) with Cu(MeCN)(4)BF(4) in water led to an efficient and reusable catalytic system for the allylic oxidation of olefins by tert-butyl perbenzoate. (C) 2002 Elsevier Science Ltd. All rights reserved.