Michael Schwamborn

Chemical synthesis of polyaspartates: a biodegradable alternative to currently used polycar☐ylate homo- and copolymers

Abstract In order to improve the environmental acceptability of water-soluble sequestrants and dispersants that can end up in the surface water, new alternatives to the currently used polycar☐ylate homo- and copolymers are needed. One alternative might be polyaspartates, a group of acidic polyamides. These polymers, which are functional equivalents of existing products, are biodegradable. They can be used in many different applications such as home laundry detergents, automatic dishwasher detergents, water treatment chemicals, oil field treatment additives or dispersants for a variety of organic and inorganic solids and scales.

Stereochemie planarchiraler Verbindungen, 9. Mitt.

The two isomeric 1,6-methano[10]anulene carboxylicacid methylesters as well as 2,7-methano[10]azaanulene and several of its methyl, methoxycarbonyl and bromo derivatives have been separated into enantiomers by chromatography on triacetyl cellulose in ethanol; in seven from eleven cases baseline separation was achieved and thereby optically pure enantiomers obtained. The optical rotations and circular dichroism spectra of all anulenes were recorded. From chemical correlations and comparison of the CD spectra relative configurations were deduced; from chiroptical comparison with 2-methyl-1,6-methano[10]anulene of known absolute configuration and on the basis of the justmentioned correlations also absolute chiralities were tentatively proposed for the methano[10]azaanulenes.