28-02-2013 | Yuta Muraki, Tomonori Taguri, Masanobu Yamamoto, Paulo H. G. Zarbin, Tetsu Ando, European Journal of Organic Chemistry, 2013

Abstract The stink bug Pallantia macunaima (Heteroptera: Pentatomidae) is a soybean pest in southern Brazil, and the males produce 6,10,13‐trimethyltetradecan‐2‐one to communicate with females. All four stereoisomers of the sex pheromone were synthesized by coupling two chiral building ...

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13-02-2013 | Xu Yan, Shuo Zhou, Yuanqiang Wang, Zemei Ge, Tieming Cheng, Runtao Li, ChemInform, 2013

Abstract Title compounds (III) and (V) are synthesized by the present new reaction of different acylhydrazines (I) and (IV) with carbon disulfide (II) promoted by propylene oxide.

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05-02-2013 | Monica A. Fuchs; Thomas Zevaco; Erika Ember; Olaf Walter; Ingmar Held; Eckhard Dinjus; Manfred Doering, Dalton Transactions, 2013

We report the successful utilization of monometallic iron(II)- and iron(III)-N2O2-ligand-systems as highly active homogeneous catalysts for the conversion of CO2 with different epoxides to cyclic carbonates. The catalytic tests were performed using propylene oxide (PO) and a range of nine ...

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05-02-2013 | Jie Liu; Wei-Min Ren; Ye Liu; Xiao-Bing Lu, Macromolecules, 2013

Trivalent cobalt complexes of salicylaldimine in the presence of an inter- or intramolecular nucleophilic cocatalyst have proven to be excellent catalysts for the copolymerization of CO2 and epoxides to selectively afford the corresponding polycarbonates in perfectly alternating nature. ...

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01-02-2013 | Tian‐Bin Ren, Chang‐Jin Liu, Wei Wu, Kuan Ye, Wei‐Zhong Yuan, Polymer International, 2013

Abstract Novel, well‐defined A4BA4 nonlinear block copolymers [poly(ϵ‐caprolactone)]4‐block‐poly(propylene oxide)‐block‐[poly(ϵ‐caprolactone)]4 (PCL4‐b‐PPO‐b‐PCL4) with eight arms were synthesized by ring‐opening polymerization. An investigation of melting and crystallization demonstrated ...

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30-01-2013 | Monireh Aminian, Abdorreza Mohammadi Nafchi, Marzieh Bolandi, Abd Karim Alias, Starch - Stärke, 2013

Abstract The effects of etherification on properties of sago starch were investigated. Hydroxypropylated sago starch (HPSS) was prepared in basic medium in ratios ranging from 0 to 70% v/w propylene oxide to sago starch. The physicochemical, thermal, and rheological properties of HPSS ...

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19-01-2013 | Elfi Kraka, Marek Freindorf, Dieter Cremer, Chirality, 2013

ABSTRACT Chiral discrimination of homochiral and heterochiral H‐bonded complexes is a challenge for both experimentalists and computational chemists. It is demonstrated that a two‐pronged approach based on far‐infrared vibrational spectroscopy and the calculation of local mode frequencies ...

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11-01-2013 | Eneko Larrañeta; José Ramón Isasi, Langmuir, 2013

The phase behavior of two types of poly(ethylene oxide)/poly(propylene oxide) (PEO/PPO) copolymers in aqueous solutions was studied by light scattering, viscometry, and infrared spectroscopy. Both the reverse poloxamer (Pluronic 10R5) and the star type poloxamine (Tetronic 90R4) have ...

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09-01-2013 | Jeannette Geschwind, Frederik Wurm, Holger Frey, Macromolecular Chemistry and Physics, 2013

Abstract Copolymerization of CO2 and epoxides is employed to generate functional polycarbonates. The introduction of reactive double bonds at a poly(propylene carbonate) (PPC) backbone is realized by the copolymerization of aliphatic alkene epoxides with propylene oxide (PO) and carbon ...

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07-12-2012 | Marina González-Pérez; Rafael Gómez-Bombarelli; Jorge Arenas-Valgañón; M. Teresa Pérez-Prior; M. Pilar García-Santos ..., Chemical Research in Toxicology, 2012

The chemical reactivity of the mutagenic epoxides (EP) propylene oxide (PO), 1,2-epoxybutane (1,2-EB), and cis- and trans-2,3-epoxybutane (cis- and trans-2,3-EB) with 4-(p-nitrobenzyl)pyridine (NBP), a bionucleophile model for SN2 alkylating agents with high affinity for the guanine-N7 ...

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