10.1016/S0040-4020(01)00801-8
The study focuses on the synthesis of functionalized tetradentate ligands for use in Ru-sensitized solar cells, aiming to improve light absorption and prevent cis-isomerization. Key chemicals used include 6,6'-bis(1-H-benzimidazol-2-yl)-4,4'-bis(methoxycarbonyl)-2,2'-bipyridine and a series of new quaterpyridines as tetradentate ligands, along with various reagents such as peracetic acid, dimethyl sulfate, potassium cyanide, and o-phenylenediamine dihydrochloride. These chemicals serve to construct and modify the ligands through a series of reactions, with the goal of creating stable trans-complexes that enhance the efficiency of solar cells by shifting the lowest energy MLCT band and improving light absorption.
10.1016/S0040-4039(02)00632-9
The research investigates the stereoretentive C-C bond formations in aldol cyclisations of 1-(3-oxobutyryl) derivatives of L-4-oxaproline and L-proline isopropyl esters. The purpose of the study was to explore the possibility of simplifying the self-generation of stereocenters in the synthesis of β-C-substituted β-amino acids, a class of compounds with wide-ranging biological properties, by leveraging the chirality memory effects observed in enolate intermediates. The researchers concluded that the aldol cyclisations conducted on oxaproline and proline scaffolds demonstrated significant retention of configuration, extending the scope of stereoinductions attributable to axially chiral enolate intermediates. Key chemicals used in the process included L-serine, isopropyl esters, L-oxaproline, L-proline, diketene, triethylamine, and potassium cyanide, among others. The study's findings are significant as they provide insights into the role of axially chiral enolate intermediates in stereoselective synthesis and contribute to the development of more efficient methods for producing enantioenriched β-C-substituted β-amino acids embedded in heterocyclic frameworks.
10.1021/jo00357a027
The research focuses on the preparations and reactions of 10-(halomethy1ene)anthrones, which are derivatives of anthrones with potential synthetic applications. The study aims to explore the reactivity of these compounds with various nucleophiles and the mechanisms involved in their vinylic substitution reactions. The researchers synthesized (halomethy1ene)anthrones 3 and 4 from 10-methylene- and 10-benzylideneanthrones and investigated their reactions with nucleophiles such as azide, cyanide, methoxide, hydroxide, and aniline. The conclusions drawn from the study indicate that these reactions proceed via a nucleophilic addition-elimination route rather than an SN1 mechanism, as the reactions are influenced by the nature of the nucleophile and occur rapidly at ordinary temperatures. The study also found that the presence of a phenyl group on the bromine-bearing carbon in 4b reduces reactivity, suggesting that resonance and inductive electron-withdrawing effects play a role in stabilizing intermediate carbanions. Key chemicals used in the process include 10-methyleneanthrone, 10-benzylideneanthrone, sulfuryl chloride, sodium azide, potassium cyanide, sodium methoxide, sodium hydroxide, and aniline, among others. The research provides valuable insights into the reactivity and synthetic potential of 10-(halomethy1ene)anthrones.
10.1016/S0022-328X(99)00709-3
The study in the Journal of Organometallic Chemistry focuses on the direct nucleophilic displacement of halides (chlorine or iodine) in compounds with the formula (Me3Si)3CSiRRX, where R and R represent various organic groups. The researchers investigated the reactions of these compounds with nucleophiles such as KOCN, KSCN, KCN, or NaN3 in different solvents like CH3CN, MeOH, and DMSO, or CH3CN mixed with H2O. The study explores the influence of steric hindrance on the reactivity of silicon centers bearing the bulky trisyl group (Tsi). It was found that by reducing the steric hindrance or using linear nucleophiles, direct bimolecular displacement reactions occur without the observation of rearrangement. The study also successfully synthesized new compounds with different groups and examined their reactivity with the mentioned nucleophiles, providing insights into the ease of reactions on silicon centers bearing the bulky trisyl group.
10.1016/j.tet.2007.03.116
The research focuses on the novel synthesis of 2-aminopentanedinitriles from 2-(bromomethyl)aziridines and their subsequent transformation into 2-imino-5-methoxypyrrolidines and 5-methoxypyrrolidin-2-ones. The study explores an unprecedented reaction mechanism involving base-induced ring opening of intermediate 2-(cyanomethyl)aziridines into allylamines, followed by migration of the double bond towards aldimines via enamine intermediates. The synthesized aminopentanedinitriles serve as precursors for the preparation of glutamic acid derivatives, which are significant in the central nervous system as excitatory neurotransmitters. The experiments utilized reactants such as 1-arylmethyl-2-(bromomethyl)aziridines, potassium cyanide in DMSO, and sodium methoxide in methanol. The analyses included column chromatography for purification, and various spectroscopic techniques such as NMR, IR, and MS for structural characterization and confirmation of the synthesized compounds.
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