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Showing 1 to 20 of 43 for “"Hydroboration"”.
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Fluorinated boranes in dehydrocoupling and hydroboration
… RnB(C6F5)3−n (n = 1, 2) through facile hydroboration of alkenes using Me2S·BHn(C6F5)3−n. In particular, the double hydroboration of 1,5-cyclooctadiene with Me2S·BH2(C6F5) resulted in isolation and crystallographic characterization of pentafluorophenyl-9-borobicyclo[3.3.1]nonane …
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Synthesis of New Alkyn-1-ylsilanes. 1,1-Organoboration, 1,2-Hydroboration
… prepared, characterized and their use in 1,2-hydroboration, 1,1-organoboration reactions or combination of these two was demonstrated. Although the silanes were in general obtained as mixtures, they could be purified by fractional distillation or crystallization. Many of these silanes were …
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Hydrosilylation and hydroboration catalyzed by imido-hydride complexes of molybdenum (IV)
… and (PPh3CuH)6. Complex 2 also catalyzes hydroboration of carbonyls and nitriles. We report the first case of metal-catalyzed hydroboration of nitriles as well as hydroboration of carbonyls at very mild conditions. Conversion of carbonyl functions can be performed with high selectivities …
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Catalytic hydroboration: a study of model hydridoiridium and hydridorhodium boron complexes
The mechanism of catalytic hydroboration was studied through the use of iridium and rhodium model complexes. Oxidative addition of the B-H bond in (1,2-phenylenedioxy) borane (catecholborane) to (Me₃P)₃Ir(Cl)(H) (BO₂C₆H₄ (<B>II</B>) produces <i>mer</i>-(Me₃P}₃Ir(Cl)(H)(B0₂C₆H₄) (<B>II</B>), which …
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Approaches to the synthesis of Phthalideisquinolines [sic] and synthesis and hydroboration of benzocyclene oxides
iii, 192 leaves : ill., tables ; 30 cm.
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Dearomative hydroboration-enabled synthesis of idarubicinone and synthesis of minor cannabinoids and their metabolites
… arene oxidation and a novel dearomative hydroboration. This global functionalization strategy, a combination of site-selective arene- and dearomative-functionalizations, provided the key anthracycline framework in five operations and enabled rapid and controlled access to idarubicinone. …
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Regio- and Stereo- selective Methods for the Borylation of Substituted Alkynes
… phosphine-catalyzed regio- and stereo-selective hydroboration of propiolonitriles to generate novel β-borylacrylonitriles in up to 89% yield and 97:3 (E)-selectivity. These products were converted to the corresponding postassium 1,2-vinylcyanotrifluoroborate salts and demonstrated applications in …
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Synthetic routes to hydroxyaucanebobonic acids and their derivatives
… reference to reaction sequences involving the hydroboration of alkenes and interaction of Grignard reagents with borate esters. Hydroboration followed by redistribution with trimethylene borage was carried out on the O-tetrahydropyranyl ethers of prop-2-en1-ol, pent-4-en-1-ol, pent-4-en-2-ol, …
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Metal-catalyzed reactions.
… of interest were in the directed, catalytic hydroboration of olefins and in nucleophilecatalyzed reactions. Indenylrhodium(olefin)2 (and other Cp-derived rhodium complexes) were utilized in the directed hydroboration reactions. Both iron and ruthenium complexes with n-bound heterocyclic …
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Development of Electrolyte Salts for Multivalent Ion Batteries
… Na into the cathode material. In chapter 5 the hydroboration of pyridines and CO2 in the presence of pinacolborane is presented. An optimized system employing NH4BPh4 and HBpin is developed and a mechanism of pyridine hydroboration is proposed based on multinuclear NMR spectroscopy. The …
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Chemical Modification of Cellulose Esters for Oral Drug Delivery
… the viability of chemoselective olefin hydroboration-oxidation in the synthesis of cellulose omega]-hydroxyesters in the presence of ester groups. Cellulose esters with terminally olefinic side chains were transformed to the target products by two-step, one-pot hydroboration-oxidation …
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Towards the Synthesis of the Unusual Monosaccharides Found in the Shigella sonnei O-Antigen and Analysis of Shigella flexneri 2a Glycoconjugate Vaccine Samples
… initial formation of the 5-ene, followed by a hydroboration/oxidation, but this led exclusively to the Drather than the L-sugar. Computer modelling and literature precedent suggested that the anomeric configuration strongly influenced the face selectivity of the hydroboration step. An αanalogue …
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Metal-containing and Metal-free systems for small molecule activation
… only bind CO2 reversibly, but also catalyze the hydroboration of CO2 with a wide borane scope. In Chapter 3, a possible intermediate from the catalytic cycle was isolated and it partly revealed the mechanism of the catalytic reaction.
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Boron-Mediated Semireduction of Alkynoic Acid Derivatives
… We investigated the trans-selective hydroboration of primary and secondary propiolamides as reports in the literature accomplish trans-hydroboration via transition metal catalysis, which are limited in substrate scope. We discovered that addition of n-butyllithium to propiolamide and …
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Trans Addition of B-X Reagents Across Polarized Triple Bonds and Development of Sphingosine-1-Phosphate Transport Inhibitors
… then go on to describe an organocatalyzed trans hydroboration of propiolate esters as well as a complementary Brønsted base-mediated trans hydroboration reaction of propiolamides. To conclude this portion, we demonstrate how the products from the previous methods can be used to synthesize …
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Advances in the synthesis of indazoles: regioselective C-7 functionalization by directed ortho metalation and progress towards indazole based azaborine compounds
… bearing substituted indazole was subjected to hydroboration conditions but without any conversion to the desired products. C-3 protected Indazoles bearing N- Directed Metalation Groups (DMGs) enabled their C-7 functionalization using DoM chemistry, and thereby led to the development of a new …
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Bond activation and catalysis by nontrigonal tricoordinate and tetracoordinate phosphorus compounds
… presented. B-H activation and catalytic imine hydroboration are achieved via the combination of the electrophilic phosphorus center and the basic anilide ligand moiety of this Cs-symmetric phosphorus compound. Finally, Chapter 4 extends the study of distorted phosphorus compounds to [sigma]⁴ …
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