Global ETD Search
Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
Results
Showing 1 to 9 of 9 for “"oxazolidine"”.
-
Basic studies of the cross-linking reaction of collagen with oxazolidine and plant polyphenols
… reaction between collagen, condensed tannins and oxazolidine, two prodeiphinidin tannins have been studied: extracts from pecan nutshell pith and myrica esculenta bark. The tannin chemistry study showed pecan tannins are copolymers of catechin and gallocatechin with a ratio 1:6 and myrica tannins …
-
Diastereoselective aza-cope rearrangement-mannich cyclizations of conformationally mobile iminium cations
… ACM for disubstituted pyrrolidine systems using oxazolidine starting materials. A proof of concept dimethyl-substituted oxazolidine was subjected to ACM conditions, producing the pyrrolidine with good yields. However, when methyl-phenyl substituted oxazolidine was subjected to ACM conditions, …
-
Extraction, characterisation and application of gelatin from chrome-tanned leather waste
… the crosslinking agents glutaraldehyde (GTA), oxazolidine II, ethylene glycol cliglycidyl ether (epoxy compound), hexamethylene dii socyanate (HMDC) and I -ethyl-3 -(3 -dimethylaminopropyl) carbodiimide (EDC), improved the performance in terms of strength and stability of the gelatin: …
-
CoMFA Study of Chiral Catalysts
… the Diels-Alder reaction of N-2-alkenoyl-1, 3-oxazolidine-2-one with cyclopentadiene. It is shown that extemely high q2 statistics can be derived using standard modeling protocols when internal validation alone is done as well as when an external test set is used. From these models it is shown …
-
Phenolic reactions for leather tanning and dyeing
… collagen and dihydroxynaphthalenes (DHNs) and oxazolidine have been investigated, using hide powder and sheepskin pickled pelt. This investigation showed that some DHNs have a tanning effect on collagen. The measurement of combined and cross-linked DHNs on collagen showed that 30-40% of 1,6- …
-
Advancements in the diastereoselective synthesis of acyl pyrrolidines via the tandem aza-Cope—Mannich cyclization pathway
… transformation. Our synthetic method employs the oxazolidine starting material as a mixture of diastereomers to produce one pyrrolidine diastereomer. Both ethyland substituted phenyl-oxazolidines were successfully rearranged. This work is the first example of a truly catalytic aza-Cope—Mannich …
-
Preparation of azidobrevianamide A and synthetic and biological studies of tetrazomine
… undergoes a redox self-disproportionation of the oxazolidine moiety in an analogous manner to quinocarcin. The oxidized and reduced products were isolated by HPLC and characterized. It was proposed that under aerobic conditions tetrazomine generates superoxide via the proposed disproportionation …
-
Synthesis of Biologically Relevant Sphingolipid Analogues
… the tert-Boc protected amine were locked in an oxazolidine ring. Hence, the desired E-styryl PDMP analogues have been synthesised in 16 steps starting from D-serine. The synthetic route was developed such that future introduction of different aryl groups is straightforward. Throughout the …
-
Kinetic Resolution of N-Acyl-b-Lactams, b-Lactams, and N-Acyl-Thiolactams using Amidine-Based Catalysts
… enantioenriched thiazolidin-2-thiones and oxazolidine-2-thiones. And last but not least, the first enantioselective N-acylation of β-lactams: a Type I process) has been obtained with acceptable to good selectivities. This method complements the enantioselective alcoholysis of …