ISSN:
0887-624X
Schlagwort(e):
poly(diphenyl-o-tolylmethyl methacrylate)
;
one-handed helical conformation
;
propeller-propeller transition
;
Chemistry
;
Polymer and Materials Science
Quelle:
Wiley InterScience Backfile Collection 1832-2000
Thema:
Chemie und Pharmazie
Notizen:
Diphenyl-o-tolymethyl methacrylate (DPTMA) was synthesized and polymerized using initiators of organolithium complexes with (+)-(2S,3S)-dimethoxy-1,4-bis(dimethylamino) butane (DDB) and (-)-sparteine (Sp) as the chiral ligands. DDB was suitable for its complex effective to prepare optically active poly(diphenyl-o-tolylmethyl methacrylate) (PDPTMA) with one-handed helical conformation, whereas only low-molecular weight polymer was formed when Sp was used as ligand due to the repulsive hindrance between the triarylmethyl group and the ligand. A new mutarotation propeller-propeller transition, was observed for PDPTMA from the optical rotation curves and CD spectra in THF solution. The equivalent period of PDPTMA was estimated to be 14 Å based on the x-ray diffraction. © 1993 John Wiley & Sons, Inc.
Zusätzliches Material:
6 Ill.
Materialart:
Digitale Medien
URL:
http://dx.doi.org/10.1002/pola.1993.080311102
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