Polymer ester von sären des phosphors, 7. Polymerisation des 1-oxo-2,6,7-trioxa-1-phosphabicyclo[2.2.1]heptans
✍ Scribed by Gehrmann, Thomas ;Vogt, Walter
- Publisher
- Wiley (John Wiley & Sons)
- Year
- 1981
- Weight
- 393 KB
- Volume
- 182
- Category
- Article
- ISSN
- 0025-116X
No coin nor oath required. For personal study only.
✦ Synopsis
Abstract
1‐Oxo‐2,6,7‐trioxa‐1‐phosphabicyclo[2.2.1]heptane is transformed in situ (prepared from trimethyl phosphite and glycerol) at −78°C in the presence of a trace of water into a crosslinked polymer containing constitutional repeating units with 5‐ and 6‐membered rings. The reaction with reagents containing hydroxyl groups (water, acetic acid, alcohol) leads to the degradation of the network with the formation of soluble fragments with P~n~ = 35–50. This reactivity and the possibility to obtain other derivatives from the fragments make this polymer a carrier for pharmacologically active polymers with the advantage of decomposing only into the innocuous components phosphoric acid and glycerol.
📜 SIMILAR VOLUMES
2-Athoxy-2-oxo-1,3.2-dioxaphospholan ( I ) wird durch verschicdenc Alkoholate sehr schnell und in hohcr Ausbeutc zu Poly[oxy(iithoxyphosphoryl)oxyathylen] (3) polymerisiert. Die Produkte sind hochviskos und farblos. Sie losen sich in Wasser. Alkoholcn. Tetrahydrofuran, Dioxan, Methylenchlorid, Chlor
## Abstract Die ringöffnende Polymerisation des 2‐Äthoxy‐2‐oxo‐4,5‐dihydro‐1,3,2‐dioxaphosphorins (**1**) mit Alkoholaten als Initiatoren, ist durch folgende Merkmale gekennzeichnet: (a) Zur Polymerisation sind Temperaturen von über 100°C und Reaktionszeiten von vielen Tagen erforderlich. (b) Es st
## Abstract 2‐Phenoxy‐1,3,2‐dioxaphospholane (**14**) was polymerized by benzyl halogenides at temperatures between 120 and 200°C. It was found that the main chain consists predominantly of unexpected ethylene 1,2‐ethanediphosphonate units **7**; only about 10% of the monomer was incorporated as th