Urea, the white gold: The efficient synthesis of tertiary and secondary amines is achieved by heterogeneous gold-catalyzed direct amination of stoichiometric alcohols with urea in good to excellent yields. Via a hydrogen autotransfer pathway, the reactions of primary alcohols with urea give tertiary amines exclusively, while secondary alcohols selectively afford secondary amines.
Download full-text PDF |
Source |
|---|---|
| http://dx.doi.org/10.1002/cssc.201100581 | DOI Listing |
Publication Analysis
Top Keywords
Similar Publications
Effects of early propranolol administration on mortality from severe, traumatic brain injury: a retrospective propensity score-matched registry study.
Eur J Trauma Emerg Surg
January 2025
Department of Neurosurgery, Penn State Health Milton S. Hershey Medical Center, Hershey, PA, 17033, USA.
Background: The role of beta-blockers in severe, traumatic brain injury (TBI) management is debated. Severe TBI may elicit a surge of catecholamines, which has been associated with increased morbidity and mortality. We hypothesize administering propranolol, a non-selective beta-blocker, within 48 h of TBI will reduce patient mortality within 30 days of injury.
View Article and Find Full Text PDFEffects of epidural dexmedetomidine on patient-controlled epidural analgesia after total knee arthroplasty: a single-center, prospective, double-blind, randomized controlled study.
J Int Med Res
January 2025
Department of Anesthesiology and Pain Medicine, Saint Vincent's Hospital, College of Medicine, Catholic University of Korea, Suwon, Korea.
Objective: To evaluate the impact of adding epidural dexmedetomidine to low-concentration patient-controlled epidural analgesia (PCEA) on pain control and side effects in total knee arthroplasty (TKA).
Methods: In this double-blind study, American Society of Anesthesiologists I to II patients undergoing TKA were assigned to receive 0.125% bupivacaine + fentanyl 4 µg/mL (group R) or 0.
Determination of Cyazofamid and Its Metabolite in Rice Based on Magnetic Zirconia Nanoparticles Sample Cleanup and Its Application to a Dissipation and Residue Study.
J Agric Food Chem
January 2025
College of Plant Protection, Jilin Agricultural University, Changchun, Jilin 130118, China.
An analytical method was developed for the determination of cyazofamid (CZFM) and its metabolite CCIM in rice, employing magnetic zirconia nanoparticles (MZNPs) for sample cleanup. MZNPs were synthesized through a one-step hydrothermal process and characterized by multiple techniques. Samples of rice plant, rice hull, and brown rice were extracted using acetonitrile/water, followed by salting out.
View Article and Find Full Text PDFContinuous local infiltration analgesia is equal to femoral and sciatic nerve block for total knee arthroplasty.
Arch Orthop Trauma Surg
January 2025
Department of Anaesthesia, Main-Kinzig-Kliniken, Herzbachweg 14, 63571, Gelnhausen, Germany.
Background: Total knee arthroplasty (TKA) is associated with moderate to severe postoperative pain. Pain control is crucial for rapid mobilisation and reduces side effects as well as the length of hospital stay. In this context, a variety of multimodal pain control regimes show good pain relief, including several nerve blocks, iPACK and local infiltration analgesia (LIA).
View Article and Find Full Text PDFCatalyst-derived hierarchy in 2D imine-based covalent organic frameworks.
Nanoscale
January 2025
Dept. of Chemical and Biomolecular Engineering, Lehigh University, Bethlehem, PA 18015, USA.
Identifying facile strategies for hierarchically structuring crystalline porous materials is critical for realizing diffusion length scales suitable for broad applications. Here, we elucidate synthesis-structure-function relations governing how room temperature catalytic conditions can be exploited to tune covalent organic framework (COF) growth and thereby access unique hierarchical morphologies without the need to introduce secondary templates or structure directing molecules. Specifically, we demonstrate how scandium triflate, an efficient catalyst involved in the synthesis of imine-based COFs, can be exploited as an effective growth modifier capable of selectively titrating terminal amines on 2D COF layers to facilitate anisotropic crystal growth.
View Article and Find Full Text PDFWant AI Summaries of new PubMed Abstracts delivered to your In-box?
Enter search terms and have AI summaries delivered each week - change queries or unsubscribe any time!