نتایج جستجو برای: polyethers
تعداد نتایج: 219 فیلتر نتایج به سال:
The structural features of polycyclic polyether natural products can, in some cases, be traced to their biosynthetic origin. However in case that are less well understood, only biosynthetic pathways that feature dramatic, yet speculative, epoxide-opening cascades are proposed. We summarize how such epoxide-opening cascade reactions have been used in the synthesis of polycyclic polyethers (see s...
Exhaustive studies on the degradation of plastics have been carried out in order to overcome the environmental problems associated with synthetic plastic waste. Recent work has included studies of the distribution of synthetic polymer-degrading microorganisms in the environment, the isolation of new microorganisms for biodegradation, the discovery of new degradation enzymes, and the cloning of ...
The Cosmetic Ingredient Review Expert Panel (Panel) reviewed the safety of methyl glucose polyethers and esters which function in cosmetics as skin/hair-conditioning agents, surfactants, or viscosity increasing agents. The esters included in this assessment are mono-, di-, or tricarboxyester substituted methyl glucosides, and the polyethers are mixtures of various chain lengths. The Panel revie...
• The discovery of the first crown ether is described. Forty-seven other aromatic and saturated polyethers were synthesized and their properties determined. Many form stable crystalline complexes with alkali and alkaline earth salts. Some saturated crown ethers solubilize potassium hydroxide and permanganate in aromatic hydrocarbons, EThe SC!5 indicates that this paper has been cited in over 1,...
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