Search results for "Ethylene"

One-pot cross-enyne metathesis (CEYM)-Diels-Alder reaction of gem-difluoropropargylic alkynes.

2013

Propargylic difluorides 1 were used as starting substrates in a combination of cross-enyne metathesis and Diels–Alder reactions. Thus, the reaction of 1 with ethylene in the presence of 2nd generation Hoveyda–Grubbs catalyst generates a diene moiety which in situ reacts with a wide variety of dienophiles giving rise to a small family of new fluorinated carbo- and heterocyclic derivatives in moderate to good yields. This is a complementary protocol to the one previously described by our research group, which involved the use of 1,7-octadiene as an internal source of ethylene.

CCDC 294531: Experimental Crystal Structure Determination

2007

Related Article: C.J.Gomez-Garcia, E.Coronado, S.Curreli, C.Gimemez-Saiz, P.Deplano, M.L.Mercuri, L.Pilia, A.Serpe, C.Faulmann, E.Canadell|2006|Chem.Commun.||4931|doi:10.1039/b610408h

CCDC 1945945: Experimental Crystal Structure Determination

2019

Related Article: Suchithra Ashoka Sahadevan, Alexandre Abhervé, Noemi Monni, Pascale Auban-Senzier, Joan Cano, Francesc Lloret, Miguel Julve, Hengbo Cui, Reizo Kato, Enric Canadell, Maria Laura Mercuri, Narcis Avarvari|2019|Inorg.Chem.|58|15359|doi:10.1021/acs.inorgchem.9b02404

Remarkable effect of organoaluminum activator on catalytic performance of bis(phenoxy-imine) titanium complexes in ethylene polymerization

2009

Zsyntezowano i sprawdzono w polimeryzacji etylenu, po uprzedniej aktywacji zarówno MAO, jak i prostymi związkami glinoorganicznymi (Et3Al, Et2AlCl, EtAlCl2), trzy kompleksy tytanu z ligandami fenoksy-iminowymi: dichlorek bis[N-(3,5-di-tert-butylosalicylideno)anilino]tytanu(IV) (kompleks I), dichlorek bis[N-(3,5-di-tert-butylosalicylideno)-1-naftyloamino]tytanu(IV) (kompleks II) i dichlorek bis[N-(salicylideno)-1-naftyloamino]tytanu(IV) (kompleks III). Stwierdzono, że zarówno struktura ligandów, jak i rodzaj glinoorganicznego aktywatora mają wpływ na aktywność badanych kompleksów. Kompleks I, zawierający podstawnik fenylowy przy iminowym atomie azotu okazał się najaktywniejszy w połączeniu z…

Non-conventional synthesis and photophysical studies of platinum(ii) complexes with methylene bridged 2,2′-dipyridylamine derivatives

2019

Methylene bridged 2,2′-dipyridylamine (dpa) derivatives and their metal complexes possess outstanding properties due to their inherent structural flexibility. Synthesis of such complexes typically involves derivatization of dpa followed by coordination on metals, and may not always be very efficient. In this work, an alternative synthetic approach, involving the derivatization step after – rather than prior to – coordination of dpa on metal center, is proposed and applied to synthesis of a number of platinum(II) complexes with substituted benzyldi(2-pyridyl)amines. Comparison with the more conventional synthetic route reveals greater efficiency and versatility of the proposed approach. The …

Compatibilization of Polylactide/Poly(ethylene 2,5-furanoate) (PLA/PEF) Blends for Sustainable and Bioderived Packaging.

2022

Despite the advantages of polylactide (PLA), its inadequate UV-shielding and gas-barrier properties undermine its wide application as a flexible packaging film for perishable items. These issues are addressed in this work by investigating the properties of melt-mixed, fully bioderived blends of polylactide (PLA) and poly(ethylene furanoate) (PEF), as a function of the PEF weight fraction (1–30 wt %) and the amount of the commercial compatibilizer/chain extender Joncryl ADR 4468 (J, 0.25–1 phr). J mitigates the immiscibility of the two polymer phases by decreasing and homogenizing the PEF domain size; for the blend containing 10 wt % of PEF, the PEF domain size drops from 0.67 &p…

Sequestration of biogenic amines by alginic and fulvic acids.

2006

The interaction of natural (alginic and fulvic acids) and synthetic (polyacrylic acid 2.0 kDa) polyelectrolytes with some protonated polyamines [diamines: ethylendiamine, 1,4-diaminobutane (or putrescine), 1,5-diaminopentane (or cadaverine); triamines: N-(3-aminopropyl)-1,4diaminobutane (or spermidine), diethylenetriamine; tetramine: N.N'-bis(3-aminopropyl)-1,4-diaminobutane (or spermine); pentamine: tetraethylene-pentamine; hexamine: pentaethylenehexamine] was studied at T=25 degrees C by potentiometry and calorimetry. Measurements were performed without supporting electrolyte, in order to avoid interference, and results were reported at I=0 mol L(-1). For all the systems, the formation of…

Acid-Labile Surfactants Based on Poly(ethylene glycol), Carbon Dioxide and Propylene Oxide: Miniemulsion Polymerization and Degradation Studies

2017

Partially degradable, nonionic AB and ABA type di- and triblock copolymers based on poly(propylene carbonate) and poly(ethylene glycol) blocks were synthesized via immortal copolymerization of carbon dioxide and propylene oxide, using mPEG or PEG as a macroinitiator, and (R,R)-(salcy)-CoOBzF5 as a catalyst in a solvent-free one-pot procedure. The amphiphilic surfactants were prepared with molecular weights (Mn) between 2800 and 10,000 g·mol−1 with narrow molecular weight distributions (1.03–1.09). The copolymers were characterized using 1H-, 13C- and DOSY-NMR spectroscopy and size exclusion chromatography (SEC). Surface-active properties were determined by surface tension measurements (crit…

Many-scale molecular modeling of PET/PEN blends

2005

Pro-Degradant Activity of Naturally Occurring Compounds on Polyethylene in Accelerate Weathering Conditions

2019

In this work, naturally occurring compounds, such as Vitamin E (VE) and Ferulic Acid (FA), at high concentrations, have been considered as pro-degradant agents for Low Density Polyethylene (PE). However, all obtained results using the naturally occurring molecules as pro-oxidant agents for PE have been compared with the results achieved using a classical pro-oxidant agent, such as calcium stearate (Ca stearate) and with neat PE. The preliminary characterization, through rheological, mechanical and thermal analysis, of the PE-based systems highlights that the used naturally occurring molecules are able to exert a slight plasticizing action on PE and subsequently the PE rigidity and crystalli…