Synthesis and self-assembly behavior of organic-inorganic macrocyclic molecular brushes composed of macrocyclic oligomeric silsesquioxane and poly(N-isopropylacrylamide)
The novel organic-inorganic molecular brush composed of macrocyclic oligomeric silsesquioxane (MOSS) and poly(N-isopropylacrylamide) (PNIPAAm) (denoted by PNIPAAm@MOSS) was synthesized via the atom transfer radical polymerization (ATRP) approach. In bulk, the organic-inorganic molecular brushes were microphase-separated; the spherical MOSS microdomains with the diameter of 10-50 nm were dispersed into a continuous PNIPAAm matrix. Depending on the lengths of PNIPAAm chains, the PNIPAAm@MOSS molecular brushes were capable of self-assembling into cylindrical or spherical nano-objects in aqueous solutions as evidenced by transmission election microscopy (TEM) and dynamic light scattering (DLS). Both micro-differential scanning calorimetry (Micro-DSC) and ultraviolet-visible spectroscopy showed that the MOSS backbones exerted significant restriction of coil-to-globule transition of PNIPAAm chains.
Metal-catalyzed radical polyaddition as a novel polymer synthetic route
A new class of polymerizations was developed via metal-catalyzed C-C bond forming radical polyaddition; the monomers were designed to have a reactive C-Cl bond, which can be activated by the metal catalysts to generate a carbon radical species, along with a C=C double bond, to which the carbon radical generated from another molecule adds to form a C-C backbone polymer with an inactive C-Cl pendant. The Royal Society of Chemistry.
Synthesis of bicyclo[2.2.1]hept-5-enyl methyl esters of haloacetic acids
Synthesis of norbornenyl methyl esters of a number of haloacetic acids via [4+2] cycloaddition of cyclopentadiene to allyl esters of these acids was examined. The yield and isomer composition of the synthesized compounds were examined in relation to the reaction conditions, and the best conditions for their preparation were found.
Kyazimova,Mamedbeili,Nagiev,Suleimanova,Khalilov
experimental part
p. 1803 - 1807
(2009/09/08)
Cyclization of allyl α-halocarboxylates in the presence of metallocomplex initiators
Allyl trichloroacetate and allyl 2,2-dichloropropionate, unlike allyl bromoacetate and allyl 2-bromopropionate, undergo cyclization into γ-lactones in the presence of a Fe(CO)5-amide system. All these esters undergo reductive dehalogenation under the action of the Bun3SnH-AlBN system.
Terent'ev,Vasil'eva,Kuz'mina,Mysov,Belokon
p. 764 - 766
(2007/10/03)
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