Preparation of a unique glucan with large intervals in molecular weight distribution. Controlled ring-opening polymerization of O-permethylcyclodextrin.
O-Permethylated cyclodextrins (MeCDs) were found to be polymerizable with the initiator-activator system of HI-I2 or HI-ZnX2, undergoing ring-cleavage to give linear 1-->4-glucan. Among several conditions investigated, HI-ZnCl2 in CH2Cl2 at 0 degree C proved most effective to control this cationic ring-opening polymerization (CROP). The MALDI-TOF-MS spectrum revealed that the molecular weight distribution of the glucan obtained from gamma-MeCD uniquely consisted of large, regular intervals, each of which were identical to the molecular weight of gamma-MeCD (1634).
Suzuki
Masato
M
Department of Organic and Polymeric Materials, Graduate School of Science and Engineering, Tokyo Institute of Technology, 2-12-1 O-okayama, Meguro-ku, Tokyo 152-8552, Japan. msuzuki@polymer.titech.ac.jp
Shimazaki
Tomofumi
T
D002412:Cations / Q000737:chemistry; D003505:Cyclodextrins / Q000737:chemistry*; D005936:Glucans / Q000138:chemical synthesis* / Q000737:chemistry; D007454:Iodides / Q000737:chemistry; D007455:Iodine / Q000737:chemistry; D008970:Molecular Weight; D011108:Polymers / Q000737:chemistry*; D019032:Spectrometry, Mass, Matrix-Assisted Laser Desorption-Ionization / Q000379:methods
D002412:Cations; D003505:Cyclodextrins; D005936:Glucans; D007454:Iodides; D011108:Polymers; D007455:Iodine