نتایج جستجو برای: glycols
تعداد نتایج: 14974 فیلتر نتایج به سال:
Environmentally friendly synthetic methods were developed for the selective preparation of new 2,3-dihydro-1,4-thiaselenine derivatives in high yields based on reactions 2-bromomethyl-1,3-thiaselenole with alcohols and water at room temperature. The reaction was accompanied by a rearrangement ring extension, leading to six-membered heterocyclic compounds, family 2-organyloxy-2,3-dihydro-1,4-thi...
Malaprade’ introduced periodic acid for the purpose of dissociating the carbon chain of polyhydric glycols. Criegee,2 a few years later, introduced lead tetraacetate-which generally acts similarly to periodic acid-as an oxidant, particularly for the purpose of recognizing the presence of two adjacent terminal hydroxyl groups in glycosides. Fleury and Lange,” at the same time, recognized that pe...
The compliance of 581 drug addicts attending six methadone substitution outpatient clinics was determined over a period of 18 months. Urine from these patients was labeled following oral administration of low molecular weight polyethylene glycols as marker substances. These substances were measured in approx. 5800 urine samples. A protocol for applying marker substances and ways to prevent subs...
This study evidences the adsorption of model nonionic polymers onto aluminogermanate imogolite nanotubes, attractive porous nanofillers with potential molecular loading and release applications. We resolve underlying mechanisms between nanotubes polyethylene glycols different weights by means nanoisothermal titration calorimetry. The analysis results provides a direct thermodynamic characteriza...
We have found that 1-alkyl-3-methylimidazolium chloride ionic liquids (ILs) can form immiscible liquid mixtures with some polyethylene glycols (PEGs). Binary mixtures of 1-ethyl-3-methylimidazolium chloride with PEG of molecular weight 1500, 2000, or 3400 g mol(-1), or of 1-butyl-3-methylimidazolium chloride with PEG of molecular weight 2000 or 3400 g mol(-1), have been found to give rise to en...
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