Association between dietary vitamin E intake and constipation: NHANES 2005-2010.

Background: This investigation aimed to analyze the association between dietary vitamin E intake and constipation prevalence among United States adults.

Methods: Utilizing data from the National Health and Nutrition Examination Survey (NHANES), this cross-sectional study assessed vitamin E intake through 24-h dietary recall and defined constipation based on the Bristol Stool Form Scale (BSFS). Logistic regression models were employed to evaluate the relationship between vitamin E intake and constipation, with results presented as odds ratios (ORs) and 95% confidence intervals (CIs).

Conversion of atmospheric CO catalyzed by thiolate-based ionic liquids under mild conditions: efficient synthesis of 2-oxazolidinones.

Thiolate-based ionic liquids, specifically the catalyst [TBP][2-Tp], have demonstrated their efficiency in catalyzing the reaction of CO with propargylic amine. This novel synthetic method can be used to synthesize various 2-oxazolidinone derivatives with high yields. The catalyst can be easily regenerated and reused without any decline in its catalytic activity.

Highly Efficient Thiolate-Based Ionic Liquid Catalysts for Reduction of CO: Selective N-Functionalization of Amines to Form N-Formamides and N-Methylamines.

Developing efficient catalysts to convert CO into value-added chemicals is valuable for reducing carbon emissions. Herein, a kind of novel thiolate-based ionic liquid with sulfur as the active site was designed and synthesized, which served as highly efficient catalyst for the reductive N-functionalization of CO by amines and hydrosilane. By adjusting the CO pressure, various N-formamides and N-methylamines were selectively obtained in high yields.

Synthesis of Asymmetric Urea Derivatives from COS and Amines: Substrate Selection, Scope Studies, and Mechanism Investigation.

A series of asymmetric ureas were synthesized by a one-pot reaction of amines and carbonyl sulfide (COS) under catalyst-free conditions. The highly selective synthesis of asymmetric urea was successfully achieved by the use of weakly nucleophilic aromatic amines and highly nucleophilic secondary aliphatic amines. Moreover, a reaction mechanism was proposed based on the detailed NMR and FTIR study.