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2. Crystal structure of n-{[(4''-hetexy-4-biphenylyl) carbonyl] oxy}-1-undecyne
The crystal structure of 11-{[(40-heptoxy-4-biphenylyl) carbonyl] oxy}-1-undecyne(A9EO7), an acetylene with a biphenyl mesogenic moiety, was studied bycombination of electron diffraction (ED), wide-angle X-ray diffraction (WAXD), and molecular simulation of ED pattern and molecular packing.
http://www.stageastar.comt//ss/jianxingeng/publicationsshow_13893.html
 
15. Phase transition behavior and structure of the thermotropic liquid crystal 6-{[(4''''-{[(undecyl)carbonyl]oxy}biphenyl-4yl)carbonyl]oxy}-1-hexyne
The phase transition behaviors and corresponding structures of 6-{[(4’-{[(undecyl)carbonyl]oxy}biphenyl-4yl)carbonyl]oxy}-1-hexyne (A4EE11) were investigated using differential scanning calorimetry (DSC), polarizing optical microscopy (POM) and wide angle X-ray diffraction (WAXD).
http://www.stageastar.comt//ss/jianxingeng/publicationsshow_13906.html
 
Anionic Copolymerization of Carbonyl Sulfide with Epoxides via Alkali Metal Alkoxides
Carbonyl sulfide (COS), an analogue of carbon dioxide (CO2), can be converted to CO2 via the carbonic anhydride enzymes widely existing in nature. COS is an ideal monomer for making poly(monothiocarbonate)s, which are difficult to synthesize by traditional methods. Herein, for the first time, we describe an anionic copolymerization of COS with epoxides using alkali metal alkoxides as the catalys...
http://www.stageastar.comt//ss/xhzhang/publicationsshow_14182.html
 
6. Structure and Liquid Crystalline Properties of 5-{[(4''''-Heptoxy-4-biphenylyl) carbonyl]oxy}-1-pentyne
The crystal structure and liquid crystalline properties of a biphenyl-containing acetylene, [5-[(4’-heptoxy-4-biphenylyl)carbonyloxy]-1-pentyne (A3EO7) were investigated by electron crystallography, X-ray diffraction, polarizing optical microscopy, differential scanning calorimetry, transmission electron microscopy, and atomic force microscopy.
http://www.stageastar.comt//ss/jianxingeng/publicationsshow_13897.html
 
Poly(monothiocarbonate)s from the Alternating and Regioselective Copolymerization of Carbonyl Sulfide with Epoxides
CONSPECTUS: Carbonyl sulfide (COS) is an air pollutant that causes acid rain, ozonosphere damage, and carbon dioxide (CO2) generation. It is a heterocumulene and structural analogue of CO2. Relevant to organic synthesis, it is a source of C=O or C=S groups and thus an ideal one-carbon (C1) building block for synthesizing sulfur-containing polymers through the simila...
http://www.stageastar.comt//ss/xhzhang/publicationsshow_9761.html
 
Synthesis of cyclic monothiocarbonates via the coupling reaction of carbonyl sulfide (COS) with epoxides
Two guanidine bases were used as organocatalysts for the synthesis of cyclic monothiocarbonates via the coupling reaction of carbonyl sulfide (COS) and epoxides. The systems proved to be efficient singlecomponent, metal-free catalysts for the reaction of simple (propylene oxide, 1,3-butene oxide) or activated epoxides (epichlorohydrin, glycidyl phenyl ether) with COS under solvent...
http://www.stageastar.comt//ss/xhzhang/publicationsshow_8990.html
 
Highly regioselective and alternating copolymerization of carbonyl sulfide with phenyl glycidyl ether
Abstract: Polymer structures containing sulfur atoms can provide enhancement of important polymer properties compared to their oxygen-containing counterparts. In this regard, the copolymerization of phenyl glycidyl ether and carbonyl sulfide has been very effectively achieved employing (salen)CrCl in the presence of an onium salt at ambient temperature. The resulting copolymer is ...
http://www.stageastar.comt//ss/xhzhang/publicationsshow_8743.html
 
An Examination of the Steric and Electronic Effects in the Copolymerization of Carbonyl Sulfide and Styrene Oxide
The completely alternating copolymerization of carbonyl sulfide (COS) and styrene oxide was found to occur under mild reaction conditions (0-30 °C and 1.5 MPa) in the presence of (salen)CrCl/onium salt catalyst systems to afford high molecular weight poly(monothiocarbonates) with narrow molecular weight distributions. Ring-opening of styrene oxide was shown to be 88% selective&nb...
http://www.stageastar.comt//ss/xhzhang/publicationsshow_8599.html
 
Regioselective and Alternating Copolymerization of Carbonyl Sulfide with Racemic Propylene Oxide
We report the first example of a regioregular and fully alternating poly (propylene monothiocarbonate) (PPMTC) from the well-controlled copolymerization of two asymmetric monomers, carbonyl sulfide and racemic propylene oxide, using (Salen)CrCl in conjunction with bis(triphenylphosphoranylidene)ammonium chloride. The maximum turnover of frequency of this catalyst system was 332 h-1 at 25 °C. Th...
http://www.stageastar.comt//ss/xhzhang/publicationsshow_5566.html
 
Effect of carbonyl group on sorption and transport properties of gases in polymeric membranes
关键字:Effect,carbonyl,group,sorption,transport,properties,gases,polymeric,membranes,
The object of this work was to search for the relationships between the carbonyl group density and gas transport properties in the membrane. The intrinsic gas transport properties: permeation, diffusion, and sorption in a series&n...
http://www.stageastar.com/research/dis_info7429
 
 
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aroxycarbonyltriazole        benzyloxycarbonylclass        ALKOXYCARBONYLclass        ALKOXYCARBONYL        OXYCARBONYL       
OXYCARBONYLclass        thiocarbonylthio        benzyloxycarbonyl        AZIDOCARBONYL        OXYCARBONYLclass=lfont5       
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