Mechanistic studies into the ring-opening polymerisation
The synthesis and ring opening polymerisation of functionalised chiral O carboxyanhydrides and cyclic carbonates
... 114 showed the complete loss of the epoxide signals from the 1 H NMR spectrum, presumably as a result of the acid-sensitivity of the epoxide functionality. The monomer was finally successfully dried under a static vacuum ...
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The synthesis and ring opening polymerisation of novel cyclic esters from malic acid
... 3.2.4 Ring-Opening Polymerisation studies of L -malOCA – catalyst variation These observations, in addition to the long reaction times of pyridine led to the investigation of further variation ...
280
Monomeric Ti(IV) homopiperazine complexes and their exploitation for the ring opening polymerisation of rac-lactide
... controlled polymerisation of rac -lactide can lead to either atactic, heterotactic or iso- tactic PLA the later possessing a significantly higher melt- ing ...the polymerisation of rac- lactide is shown in ...
9
Towards sequence controlled functional polyesters : advances in the ring opening (co)polymerisation of large ring and Σ subsituted lactones
... phosgene-based ring-closure of the ester functionalities, producing a carbonate monomer with a pendent five-membered ketal ...Post- polymerisation deprotection of the ketal is possible and introduces two ...
205
Catalyst and monomer design : targeting polymer properties via organic catalysed ring opening polymerisation
... quantitative polymerisation of LA (DP70) within 50 ...slower polymerisation rates, but transesterification is also suppressed due to this lower active NHC ...
222
Fluorous Catalyst Recycling Utilising Highly Fluorinated Zinc Compounds: Ring Opening Polymerisation of e Caprolactone
... “RfO-M” moiety, which would selectively partition into a fluorinated solvent and could be separated from the reaction mixture and polymer. The addition of further aliquots of monomer to the recovered catalyst should be ...
20
Vanadium(v) phenolate complexes for ring opening homo- and co-polymerisation of ε-caprolactone, L-lactide and rac-lactide
... in polymerisation catalysis is ...comparative studies the tri-phenol (L 3 H 3 ) (see Scheme 1) for the ROP of both L -lactide and 3-caprolactone and the co-polymerisation thereof, and report the ...
11
The preparation and testing of novel biodegradable surfactants using poly(lactic acid) as the backbone, by a one step ring opening polymerisation reaction
... 5.3.2 Initiation with -Hydroxyacids Some polymerisation results were obtained using sodium GHB as an initiator. These polymers were amber in colour and showed varying degrees of transesterification. In most cases ...
238
Mechanistic Studies of Donor-Acceptor Cyclopropanes
... higher ring strain energy due to the distortion of the bond angles away from the ideal 109° angle of the ...higher ring strain energy of cyclic compounds when the carbon-carbon bond angles in cyclopropane ...
138
Applications and Extensions of Living Ring Opening Metathesis Polymerization
... represents a significant chemical challenge, as most methods used to make nanoparticles rely on self-assembly techniques that yield almost exclusively symmetrical particles. Several protocols for the synthesis of Janus ...
218
Cellulose Reinforced Thermoplastic Composites By In-Situ Ring-Opening Polymerization
... to 243.9 kJ/mol in the 2wt% CNC composite. For the nanocomposite samples of 0.6 and 1wt% of CNC, the activation energies are respectively 176.5 and 202.7 kJ/mol. It is interesting to note that in a number of reported ...
362
Preparation and ring opening reactions ofN diphenylphosphinyl vinyl aziridines
... optimization studies, the (E)- N-diphenylphosphinyl-3-[2′-methoxycarbonyl)ethenyl]-2- phenylaziridine (6) could only be delivered in mediocre yield (though with excellent ...
8
Mechanistic Studies of Cholesterol Lipotoxicity Pertinent to NASH
... pore opening causes mitochondrial swelling, unfolding of mitochondrial respiratory chain proteins with release of cytochrome c into intermembranous space; subsequent rupture of outer membranes releases cytochrome ...
296
Mechanistic studies of some chemical and biochemical reactions
... Scheme 2.141-butyl-4-methyl pyridinium tetrafluoroborate (left) and 1-butyl-3-methyl imidazolium tertrafluroroborate (right). The medical industries are always on the search for new non-toxic, broad spectrum, safe ...
227
Ring opening metathesis polymerisation of a new bio-derived monomer from itaconic anhydride and furfuryl alcohol
... Presently it is not known whether the esterification reaction precedes the Diels–Alder cycloaddition, yielding intermediate 3b , or whether the Diels–Alder cycloaddition occurs first, giving intermediate 4 , followed by ...
5
STUDIES ON SYNTHETIC AND MECHANISTIC ASPECT OF NOVEL HETERO-RING FUSED PYRIDINES AND THEIR BIOLOGICAL ACTIVITY
... Piritrexim ( PTX ), a pyrido[2,3-d]pyrimidine is used as potent non-classical DHFR inhibitor. The aza-indole or pyrrolopyridine ring systems form the basic skeleton in many of the biologically active alkaloids and ...
10
Electrochemical studies of interfacial polymerisation processes
... 81 polymerisation takes place in a water-only solvent system it will be more useful for mechanistic studies to electrochemically monitor epoxide dissolution in water ...voltammetry studies (in ...
231
Mechanistic studies on myrosinase
... Solvent kinetic isotope effects (SKIE) are also very useful since for a substrate substituted with a heavy atom, only one reaction step is sensitive to the change, whereas with a labelled solvent, the isotope effects are ...
287
Mechanistic studies of acetolactate decarboxylase
... 4.3.3 Site-directed mutagenesis Active site mutants of alsD were generated for future studies to identify the residues involved in catalysis. As there is no crystal structure of AlsD, the residues were identified ...
245
Mechanistic studies on threonine synthase
... Although the activity of threonine synthase was high enough from the G 150 column to allow us to carry out initial kinetic studies, we were keen to purify the protein further. Ion-exchange chromatography was ...
173