Substituted 5-aryl-1,3-oxazolidin-2-ones can be efficiently prepared from arylethylene oxides and tert-butyl alkylcarbamates in the presence of catalytic amount of potassium tert-butoxide as a base. Their further hydrolysis under basic conditions provides aryl substituted aminoethanols in high yields.

Overall heterozygosity was high in all roach populations, and so was gene flow between them. However, genetic diversity was greater in the fast-flowing and more diverse French Upper Rhone than in the uniformly lentic River Saone. Rhone backwaters may be considered as ecotones and reservoirs of genetic diversity, but such is not the case in the Saone owing to the uniformity of the environment.