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 20 of 22 for “"Acetylenes"”.
-
Infrared Chemiluminescence Study of Reactions Between Oxygen Atoms and Carbon Disulfide and Oxygen Atoms and Acetylenes
Made available in DSpace on 2014-12-13T20:09:50Z (GMT). No. of bitstreams: 1 7616143.pdf: 3016253 bytes, checksum: 16a0a6c5f7cb6921b51c1264e9ce95a0 (MD5) Previous issue date: 1976
-
Further investigations into the mechanism of the o-directed free radical hydrostannation of alkyl and aryl acetylenes
This project demonstrates the extensive further investigations that have been conducted into the O-directed free radical hydrostannation that were required to lay to rest the debate regarding the exact mechanistic path by which this reaction was occurring due to multiple contradicting mechanisms …
-
Synthesis of molybdenum(VI) alkylidene complexes as catalysts for living polymerizations of terminal acetylenes and olefin metathesis
Thesis (Ph. D.)--Massachusetts Institute of Technology, Dept. of Chemistry, 1993.
-
The Synthesis of Naphthalene-Containing Compounds and Materials Using Benzannulation Reactions
… strategy (Chapter 1). Silyl protected acetylenes are readily reacted to yield the corresponding 2-naphthylsilane. These compounds serve as synthetically useful building blocks for further derivatization and iterative benzannulation to access sterically crowded substrates (Chapter 2). …
-
Catalytic hydroboration: a study of model hydridoiridium and hydridorhodium boron complexes
… The reaction of <B>II</B> with acetylenes was inhibited by the presence of free Lewis bases indicating that the reaction proceeds by a dissociative mechanism. Exchange of the chloride ligand in <B>II</B> occurred with other Lewis bases, indicating that chloride dissociation was …
-
Mechanistic and synthetic studies of the intramolecular [4+2] cycloaddition of conjugated enynes
… intramolecular cycloaddition of conjugated arylacetylenes (arenynes) indicated that these compounds may react by a stepwise annulation mechanism involving biradical intermediates. An investigation of the use of protic solvents has shown that alcohols, in particular 2,2,2-trifluoroethanol, can …
-
Donor-Acceptor Cyclobutanes and Their Application for Heterocycle Synthesis and Progress Towards Biselide A
… from alkynyl addition and rearrangement. Aryl acetylenes were compatible with the reaction conditions and moderate yields were obtained (31 - 53%). When a silyl ether protected aryl acetylene was deployed the expected formal [4+2] cycloadduct is observed. The application of a water soluble …
-
Oxidation addition of H-H bonds to iridium: developing novel active water soluble catalysts for hydrogenation of unsaturates
… ligand. <b>(2)</b> reacted with monosubstituted acetylenes and an internal diyne in water to form the vinyl complexes Ir(H)(C(R')=C(H)-(R))(PMe₃)₃CI (R = CMe₃, C₆H₅, SiMe₃, R' = H, <b>(4)-(6);</b> R' = CCMe₃, R= Me, <b>(7)). (2)</b> also reacted in water with ethynylpyridine to form an unusual …
-
Zinc polysulfides as precursors to zinc sulfide and as group transfer reagents
… ZnS$\sb6$(TMEDA) reacts with the electrophilic acetylenes methylpropiolate and dimethylacetylenedicarboxylate (DMAD) to give the dithiolene complexes $\rm ZnS\sb2C\sb2R(CO\sb2Me)$(TMEDA), where R = $\rm CO\sb2Me,$ H.
-
Synthesis characterization, and reactivity of ruthenium maltolato complexes
… reactions of terminal acetylenes with transition metal complexes are discussed and a mechanism for the dimerization reaction is proposed.
-
Synthesis and characterization of electrophilic group 4 metal complexes of benzynes
… fragments including nitriles, alkenes, and acetylenes to form metallacyclic species and has found applications in organic synthesis. This benzyne also couples with tungsten hexacarbonyl to afford a Fischer-type metalloxycarbene complex.;Procedures for making the diphenyl precursors [(C5R4 …
-
An Investigation of Gold(I) Catalyzed Cycloaddition Reactions
… reaction with O-benzylhydroxylamine and aryl acetylenes catalyzed by Au(I) complex [Au(IPr)(NCPh)]<sup>+</sup>SbF6<sup>-</sup> yielding exclusively trans oximes under mild conditions.
-
Structures and Reactivities of Ionized and Metal Cation-Containing Acetylene Clusters
… interactions and favorable orientations of acetylenes in the cluster.
-
Functional polymer layers with protected amines
… 1,3-dipolar cycloaddition between terminal acetylenes and azides to attach further functionalities through the formation of a stable 1,4-disubstituted 1,2,3-triazol ring . The combination of nitroxide mediated radical polymerization (NMRP) and click chemistry was used to produce well-defined …
-
Novel Conjugate Additions and Cyclizations on Multiyne Systems
… designed terminal, trimethylsilyl and internal acetylenes containing 1,6/1,4 adducts under thermal, TBAF and silver-catalyzed reaction conditions to generate various 1,3-dihydroisobenzofuran derivatives. In addition, these 1,3-dihydroisobenzofuran derivatives contain novel frameworks with …
-
Organometallic imido, sulfido and oxo complexes of osmium(VI)
… and sulfur transfer reactions to olefins and acetylenes were reviewed in Chapter 1. The alkylosmium(VI) complexes (Y) (Os(N)(R)$\sb2$Cl$\sb2$), Os(N)(CH$\sb2$SiMe$\sb3)\sb2$Cl, Os(N)(CH$\sb2$SiMe$\sb3)\sb2$Cl(NC$\sb5$H$\sb5)$, Os (N)(CH$\sb2$SiMe$\sb3)\sb3$(Z) and …
Page 1 of 2