نتایج جستجو برای: phosphazene

تعداد نتایج: 170  

Journal: :Chemical communications 2006
Masahiro Ueno Andrew E H Wheatley Yoshinori Kondo

The use of catalytic t-Bu-P4 base dramatically improved the performance of halogen-zinc exchange of aryl iodides, and the arylzinc derivatives were functionalized under copper-free reaction conditions.

Journal: :Chemical Communications 2021

The isoselective organocatalyzed ring-opening polymerization of rac-lactide is triggered by a chiral binary organocatalytic system, achieving highly semi-crystalline and metal-free polylactides.

Journal: :Molecules 2013
Bente Mathiessen Fedor Zhuravlev

The polymer supported phosphazene bases PS-P₂(tBu) and the novel PS-P₂(PEG) allowed for efficient extraction of [¹⁸F]F⁻ from proton irradiated [¹⁸O]H₂O and subsequent radiofluorination of a broad range of substrates directly on the resin. The highest radiochemical yields were obtained with aliphatic sulfonates (69%) and bromides (42%); the total radiosynthesis time was 35-45 min. The multivaria...

2016
George S. Pappas Stefania Ferrari Xiaobin Huang Rohit Bhagat David M. Haddleton Chaoying Wan

Long cycle performance is a crucial requirement in energy storage devices. New formulations and/or improvement of "conventional" materials have been investigated in order to achieve this target. Here we explore the performance of a novel type of carbon nanospheres (CNSs) with three heteroatom co-doped (nitrogen, phosphorous and sulfur) and high specific surface area as anode materials for lithi...

Journal: :Dalton transactions 2016
Sheila Martínez-Arranz David Presa-Soto Gabino A Carriedo Alejandro Presa Soto Ana C Albéniz

A random phosphazene copolymer {[N = P((CH2)7-Br)Ph]0.5[N = PMePh]0.5}n (2) and a block copolyphosphazene {[N = P((CH2)7-Br)Ph]0.5[N = PMePh]0.5}45-b-[N = P(O2C12H8)]55 (5), having a branch with two randomly distributed units, have been synthesized and used as precursors for the stannyl derivatives {[N = P((CH2)7-SnBu2An)Ph]0.5[N = PMePh]0.5}n (3) and {[N = P((CH2)7-SnBu2An)Ph]0.5[N = PMePh]0.5...

Journal: :Journal of polymer science 2022

Aliphatic polycarbonates have attracted attention as degradable and sustainable materials contributing to the circular plastic economy. Their chemical recycling has not been sufficiently studied. In this study, efficacy of organocatalysts for depolymerization poly(trimethylene carbonate) (PTMC), a representative aliphatic polycarbonate, is investigated using several organic acids bases. The hyd...

2014
Sunita Awate Nelson F. Eng Volker Gerdts Lorne A. Babiuk George Mutwiri

The potent adjuvant activity of the novel adjuvant, poly[di(sodiumcarboxylatoethylphenoxy)phosphazene] (PCEP), with various antigens has been reported previously. However, very little is known about its mechanisms of action. We have recently reported that intramuscular injection of PCEP induces NLRP3, an inflammasome receptor gene, and inflammatory cytokines, including IL-1β and IL-18, in mouse...

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