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A simple isolation method for quaternary ammonium cations via ion-pair extraction using tetracyanocyclopentadienide (TCCP) was established. Separation of tetraethylammonium and carbachol cations was achieved by the selective extraction of tetraethylammonium with ethoxycarbonyl TCCP, which was moderately lipophilic. The ion-pair extraction with TCCPs was applied to the synthesis of complex quaternary ammonium salts, including a spiro vinylammonium that is a precursor of the novel 3-aza-Cope-Mannich cascade.
This article was published in the following journal.
Name: Organic letters
The compounds with a quaternary α-aryl aldehyde skeleton are important units in organic chemistry. Previously, the aryl group and carbonyl group are introduced in a stepwise manner. Herein, a novel r...
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The randomized clinical trial will aim to analyze the influence of binary and quaternary rhythm through a protocol on motor symptoms, sleep, fatigue and quality of life in individuals with...
Fifteen patients were selected, each presenting at least two jaw front teeth indicated for extraction: in the Test Group (TG), post-extraction sockets was filled by synthetic bone substitu...
A prospective randomized parallel trial will be carried out on 100 patients who have extraction of single molar tooth. Teeth extractions will be done under local anesthesia. The patients w...
This study will compare the on-eye fitting characteristics of three types of contact lenses. Each lens pair will be worn for 30 to 45 minutes before assessment and the results will be comp...
The aim of the present study is to evaluate the effectiveness of different alveolar preservation procedures performed at the time of extraction of the first or second upper molar in avoidi...
Use of various chemical separation and extraction methods, such as SOLID PHASE EXTRACTION; CHROMATOGRAPHY; and SUPERCRITICAL FLUID EXTRACTION; to prepare samples for analytical measurement of components.
The science and application of techniques for the extraction of raw materials, provision of services, manufacture of goods, cultivation of crops, and raising of livestock.
The selective extraction of deciduous teeth during the stage of mixed dentition in accordance with the shedding and eruption of the teeth. It is done over an extended period to allow autonomous adjustment to relieve crowding of the dental arches during the eruption of the lateral incisors, canines, and premolars, eventually involving the extraction of the first premolar teeth. (Dorland, 28th ed)
Extraction of the fetus by means of obstetrical instruments.
An extraction method that separates analytes using a solid phase and a liquid phase. It is used for preparative sample cleanup before analysis by CHROMATOGRAPHY and other analytical methods.