Refernces
10.1002/ejic.201000802
The study focuses on the synthesis and investigation of ruthenium complexes bearing N-H acidic pyrazole ligands and their application in catalytic hydrogenation reactions. The researchers treated chelate ligands containing pyrazole groups with various ruthenium precursors to form complexes with protic N-H groups near the catalytically active ruthenium center. These complexes were characterized by spectroscopic methods and DFT calculations, and their structure and reactivity were analyzed. The study aimed to understand the role of the acidic N-H groups in metal-ligand-bifunctional hydrogenation, where a hydrido ligand and a proton from a protic group are transferred simultaneously. The catalytic performance of these complexes was evaluated through the hydrogenation and transfer hydrogenation of acetophenone, and the results were connected to the ligand's electronic and structural properties. The research provides insights into the design of efficient catalysts for hydrogenation reactions by leveraging the acidic N-H groups in pyrazole ligands.
10.1071/CH16710
The study reports on the successful synthesis and characterization of two 28-membered, 2,2'-bipyridine-containing macrocycles in high yield. The first macrocycle was formed through a Williamson ether synthesis, and upon reduction with sodium borohydride, the second macrocycle was produced quantitatively. These macrocycles, which contain a 2,2'-bipyridine unit, are potentially useful components for creating a variety of interlocked architectures, including catenanes, rotaxanes, and molecular machines. The research builds upon previous work by Sauvage, Stoddart, and Feringa, who were awarded the 2016 Nobel Prize in Chemistry for their contributions to the design and synthesis of molecular machines, and it aims to improve upon the yield-limiting macrocyclisation reactions that have historically been a challenge in the field. The study also discusses the use of high-yielding synthetic strategies and the potential for future investigations into the metal-complexation properties of these ligands and their application in forming interlocked structures.
10.1016/S0040-4039(00)85034-0
The research aimed to synthesize and determine the structure of large ring 2-prenylcycloalkanones and 2,n-diprenylcyclic ketones. The purpose of this study was to create a series of novel 2,n-diphenylcycloalkanones for photochemical studies on large ring cycloalkanones. The researchers successfully prepared these compounds in good yield by treating the corresponding 2,n-dibromocycloalkanone with LiCuPh2, a lithium diphenylcuprate reagent. The study reported single-crystal X-ray structures for cis- and trans-2,12-diphenylcyclododecanone, indicating the successful synthesis and structural characterization of these compounds. The chemicals used in the process included 2,n-dibromocycloalkanones, lithium diphenylcuprate (LiCuPh2), anhydrous ether, hexane, methanol (MeOH) for quenching, and various solvents for extraction and purification steps. The study concluded that the method could be adapted for mono- and diphenylation of cycloalkanones, and the yields and structures of the products were reported in detail.
10.1016/0040-4039(96)00838-6
This research introduces a novel method for deblocking dithioacetals and oxathioacetals to their corresponding carbonyl compounds using periodic acid under mild nonaqueous conditions. The purpose of the study was to develop an efficient and mild deblocking method suitable for complex and acid-sensitive compounds, which is a significant challenge in organic synthesis. The researchers found that periodic acid in anhydrous solvents, such as ether and THF, effectively cleaved dithioacetals and oxathioacetals to yield aldehydes and ketones with high yields and chemoselectivity. Key chemicals used in the study included various dithioacetals, oxathioacetals, and periodic acid. The method's advantages include operational simplicity, short reaction times, and the absence of thiol odors post-reaction, making it particularly suitable for large-scale preparations. The study concluded that this nonaqueous periodic acid method is a significant addition to existing deblocking methodologies, offering versatility and ease of use for a wide range of substrates.
10.1039/c3dt51497h
The study focuses on the formation and structural characterization of a five-membered zirconacycloallenoid, a type of metallocene complex, through the reaction of a conjugated enyne with in situ generated zirconocene. The resulting compound was thoroughly analyzed using X-ray diffraction, revealing its unique structure and bonding characteristics. The research also explored the compound's reactivity, demonstrating its distinct behavior in reactions with additional zirconocene and acetonitrile, leading to the formation of different complexes. This work not only provides detailed insights into the structure and properties of metallacycloallenoid complexes but also uncovers new chemical reactions and potential applications in organometallic chemistry.
10.1021/jo301403v
The study focuses on the synthesis, characterization, and electrochemical investigation of TCNQF4 2? compounds, specifically (Pr4N)2TCNQF4 and Li2TCNQF4. Researchers controlled the reaction stoichiometry and conditions to synthesize both LiTCNQF4 and Li2TCNQF4, with the latter being a significant achievement as it represents the first large-scale chemical synthesis of Li2TCNQF4. The chemicals used in the study included LiI, TCNQF4, acetonitrile, Pr4NBr, and various solvents such as diethyl ether, methanol, and acetone. These chemicals served to react and form the desired TCNQF4 2? salts, which were then characterized using UV?vis, FT-IR, Raman, and NMR spectroscopy, as well as high-resolution electrospray ionization mass spectrometry and electrochemistry. The synthesized compounds are valuable precursors for the synthesis of derivatives of the dianions and can be used to create metal and organic-based materials with potential applications in electronics and materials science.
10.1055/s-1982-29739
The research aimed to improve the procedure for the preparation of t-alkyl aryl ethers, which are compounds for which synthesis methods in the literature are scarce and complex. The main challenge in synthesizing these compounds is the occurrence of side reactions, such as elimination reactions of the starting r-alkyl halide in basic media or rearrangements of the final product to C-alkylated phenols under acid conditions. The researchers reported a convenient modification of the existing procedure using nickel bisacetylacetonate as a catalyst and sodium hydrogen carbonate as a hydrogen chloride acceptor. This method was applied to various phenols and r-alkyl chlorides to produce t-alkyl aryl ethers with yields and conversions summarized in a table. The study concluded that the procedure was not effective for phenols with strong electron-withdrawing substituents and that ortho-substituted phenols reacted sluggishly, leading to variable amounts of rearranged products. The chemicals used in the process included phenols, r-alkyl chlorides, nickel acetylacetonate, sodium hydrogen carbonate, and diethyl ether, among others.
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