Enantiomeric impurities in chiral catalysts, auxiliaries, and synthons used in enantioselective syntheses. Part 5.

The enantiomeric excess of chiral starting materials is one of the important factors determining the enantiopurity of products in asymmetric synthesis. Fifty-one commercially available chiral reagents used as building blocks, catalysts, and auxiliaries in various enantioselective syntheses were assayed for their enantiomeric purity. The test results were classified within five impurities level (ie, <0.

Variation of anionic moieties of dicationic ionic liquid GC stationary phases: Effect on stability and selectivity.

Dicationic ionic liquids (DILs) are more and more accepted as a new class of high temperature and polar stationary phases for gas chromatography (GC). This study deals with the effect of seven different fluorosulfonyl derivatized anions associated with two dications: 1,3-di(3-methylimidazolium)-2-methylpropane [2mC(mim)], and 1,3-di(3-methylimidazolium)-isobutene [i-eneC(mim)]. Thermophysical properties of the 14 synthesized DILs were evaluated in terms of melting point, viscosity, and thermal stability.

Gas chromatography selectivity of new phosphonium-based dicationic ionic liquid stationary phases.

Three phosphonium-based dicationic ionic liquids were synthesized as bis(trifluoromethylsulfonyl) imide salts. The three dications had a nonyl spacer between two identical phosphonium-substituted groups. The three phosphonium moieties were dipropyl(phenyl), diphenyl(propyl), and diphenyl(toluyl).

Correction to: Branched-chain dicationic ionic liquids for fatty acid methyl ester assessment by gas chromatography.

The authors would like to call the reader's attention to the fact that the original publication included some corrections needed to be addressed.

Dicationic ionic liquid thermal decomposition pathways.

The rapid expansion in the study and use of ionic liquids (ILs) is a result of their unique properties including negligible volatility, high thermal stability, and ability to dissolve disparate compounds. However, because ILs have infinitely variable structures (often referred to as "tunability"), these properties can differ considerably. Herein, we focus on the thermal stability of 15 bis-/dicationic ionic liquids.

Branched-chain dicationic ionic liquids for fatty acid methyl ester assessment by gas chromatography.

Twelve bis- or dicationic ionic liquids (ILs) including eight based on imidazolium, a single one based on phosphonium, and three based on pyrrolidinium cationic units were prepared with the bis(trifluoromethyl sulfonyl) imide anion. The two identical cationic moieties were attached by different alkyl spacers having three or five carbons and differing alkyl substituents attached to the spacer. The SLB-IL111 column, as the most polar commercial stationary phase known, was included in the study for comparison.

Duloxetine Hydrochloride-Induced Oral Lichenoid Reaction: A Case Report.

Objective: To report the first case of duloxetine hydrochloride (DH)-induced oral lichenoid drug reaction (OLDR).

Clinical Presentation And Intervention: A 57-year-old male patient presented with painful ulcerative lesions on the bilateral buccal mucosa of 2-year duration. The patient was on multiple drug therapy for his systemic ailments.