Convenient Synthesis of Polymers Containing Labile Bonds in the Main Chain by Radical Alternating Copolymerization of Alkyl Sorbates with Oxygen

2000 ◽  
Vol 33 (5) ◽  
pp. 1651-1655 ◽  
Author(s):  
Akikazu Matsumoto ◽  
Hidenobu Higashi
Keyword(s):  
Main Chain ◽  
Convenient Synthesis ◽  
Alternating Copolymerization

Benzyne as a Monomer for Polymerization:  Alternating Copolymerization of Benzyne and Pyridine To Give Novel Polymers witho-Phenylene and 2,3-Dihydropyridine Units in the Main Chain

2005 ◽  
Vol 38 (6) ◽  
pp. 2167-2172 ◽  
Author(s):  
Eiji Ihara ◽  
Atsushi Kurokawa ◽  
Takeshi Koda ◽  
Takahito Muraki ◽  
Tomomichi Itoh ◽  
...  
Keyword(s):  
Main Chain ◽  
Alternating Copolymerization

Main chain dendronized hyperbranched polymers: convenient synthesis and good second-order nonlinear optical performance

2015 ◽  
Vol 6 (24) ◽  
pp. 4396-4403 ◽  
Author(s):  
Wenbo Wu ◽  
Zhipeng Wang ◽  
Rui Xiao ◽  
Zhen Xu ◽  
Zhen Li
Keyword(s):  
Nonlinear Optical ◽  
Main Chain ◽  
Hyperbranched Polymers ◽  
Second Order ◽  
Optical Performance ◽  
One Pot ◽  
Convenient Synthesis

By using low generation dendrimers as macromonomers, two main chain dendronized hyperbranched polymers, with good comprehensive nonlinear optical performance, were prepared conveniently with satisfying yields through a one-pot “A3 + B2” approach.

scholarly journals Asymmetric catalytic synthesis of polyketones and polycarbonates

2004 ◽  
Vol 76 (3) ◽  
pp. 541-546 ◽  
Author(s):  
K. Nozaki
Keyword(s):  
Main Chain ◽  
Active Species ◽  
Nitrile Group ◽  
Optically Active ◽  
Side Chain ◽  
Optically Active Polymers ◽  
Theoretical Studies ◽  
Cyclohexene Oxide ◽  
Asymmetric Catalytic ◽  
Alternating Copolymerization

Two examples are presented for the synthesis of optically active polymers with main-chain chirality from achiral monomers using chiral metal-complexes as catalysts. Asymmetric alternating copolymerization of α-olefins with carbon monoxide provided optically active polyketones when catalyzed by an (R,S)-BINAPHOS-Pd complex. From propene and CO, highly isotactic polyketone with high enantioselectivity (>97 % like diad and >95 % ee). Spectroscopic and theoretical studies revealed that the olefin insertion is the key step for the enantiofacial selection and that this step takes place at cis to the phosphine part of (R,S)-BINAPHOS. The catalyst is applicable not only to propene/CO but also to styrene/CO, which enabled the first asymmetric terpolymerization of propene/styrene/CO. The catalyst tolerates funational groups such as fluorocarbons and a nitrile group so that they can be incorporated in the side chain. Optically active polycarbonate was also synthesized by the alternating copolymerization of cyclohexene oxide with carbon dioxide via the desymmetrization of the meso-epoxide. Dinuclei zinc species prepared from diethylzinc, ethanol, and α,α'-diphenylprolinol, was revealed to be the real active species.

Convenient Synthesis of (Z)-7- and (E)-9-dodecene-1-yl Acetate, Components of Some Lepidoptera Insect Sex Pheromone

2017 ◽  
Vol 68 (1) ◽  
pp. 180-185
Author(s):  
Adriana Maria Andreica ◽  
Lucia Gansca ◽  
Irina Ciotlaus ◽  
Ioan Oprean
Keyword(s):  
Sex Pheromone ◽  
Coupling Reaction ◽  
Coupling Scheme ◽  
Lithium Aluminium Hydride ◽  
Terminal Alkyne ◽  
Mercury Derivative ◽  
Lithium Aluminium ◽  
Convenient Synthesis ◽  
Practical Synthesis ◽  
Insect Sex

Were developed new and practical synthesis of (Z)-7-dodecene-1-yl acetate and (E)-9-dodecene-1-yl acetate. The routes involve, as the key step, the use of the mercury derivative of the terminal-alkyne w-functionalised as intermediate. The synthesis of (Z)-7-dodecene-1-yl acetate was based on a C6+C2=C8 and C8+C4=C12 coupling scheme, starting from 1,6-hexane-diol. The first coupling reaction took place between 1-tert-butoxy-6-bromo-hexane and lithium acetylide-ethylendiamine complex obtaining 1-tert-butoxy-oct-7-yne, which is transformed in di[tert-butoxy-oct-7-yne]mercury. The mercury derivative was directly lithiated and then alkylated with 1-bromobutane obtaining 1-tert-butoxy-dodec-7-yne. After acetylation and reduction with lithium aluminium hydride of 7-dodecyne-1-yl acetate gave (Z)-7-dodecene-1-yl acetate with 96 % purity. The synthesis of (E)-9-dodecene-1-yl acetate was based on a C8+C2=C10 and C10+C2=C12 coupling scheme, starting from 1,8-octane-diol. The first coupling reaction took place between 1-tert-butoxy-8-bromo-octane and lithium acetylide-ethylendiamine complex obtaining 1-tert-butoxy-dec-9-yne, which is transformed in di[tert-butoxy-dec-9-yne]mercury. The mercury derivative was directly lithiated and then alkylated with 1-bromoethane obtaining 1-tert-butoxy-dodec-9-yne. After reduction with lithium aluminium hydride of 1-tert-butoxy-(E)-9-dodecene and acetylation was obtained (E)-9-dodecene-1-yl acetate with 97 % purity.

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