Analysis of the end groups of poly(methyl methacrylate)

Stepwise Two-Electron-Transfer Reduction of Cyclic Ethers and Lactones with Alkalide K-, K+(15-Crown-5)2

“…K , K + (15-crown-5) 2 , K , K + (18-crown-6) and Na , K + (18-crown-6), are known as powerful reducing agents of alkenes [1][2][3][4], alkynes [5], halides [6][7][8], ketones [9,10], esters [11][12][13][14][15] and ethers [15][16][17][18][19][20]. The reaction proceeds with the transfer of two valence electrons from the metal anion to acceptor molecules.…”

Electron-transfer reduction of selected alcohols with alkalide K−, K+(15-crown-5)2 via organometallic intermediates

“…They are known as two-electron-transfer species [5], used in the reactions with alkenes [6][7][8][9], alkines [10], alkyl halides [11,12], silyl halides [13], ketones [14,15], esters [16][17][18][19][20], and ethers [12,[20][21][22][23][24][25][26][27][28]. Organometallic compounds were intermediate products in those systems.…”

Novel concept of polymers preparation with high photoluminescent quantum yield

“…It was known from the literature [25,26] that in the anionic polymerization of monomers 1,2-butylene oxide, isopropyl glycidyl ether, allyl glycidyl ether, and phenyl glycidyl ether the chain transfer reaction to the monomer does not occur. However, in the case of polymerization of propylene oxide and styrene oxide, side reactions take place resulting in the formation of macromolecules with -OH end group (10-15 %) [23,27,28]. However, in the case of methyl methacrylate, another type of side reaction occurs during the initiation, i.e., acyl-oxygen bond cleavage (14 %) resulting in macromolecules with CH 3 Ostarting groups [29,30].…”

“…However, in the case of polymerization of propylene oxide and styrene oxide, side reactions take place resulting in the formation of macromolecules with -OH end group (10-15 %) [23,27,28]. However, in the case of methyl methacrylate, another type of side reaction occurs during the initiation, i.e., acyl-oxygen bond cleavage (14 %) resulting in macromolecules with CH 3 Ostarting groups [29,30]. The chemical structure of synthesized polymers was confirmed by 13 C NMR.…”