Boron trifluoride

About: Boron trifluoride is a research topic. Over the lifetime, 4176 publications have been published within this topic receiving 43265 citations. The topic is also known as: trifluoroboron & boron fluoride.

Absorbable cyanoacrylate compositions

Abstract: An adhesive composition is provided including one or more polymerizable cyanoacrylate monomers and boron trifluoride as a stabilizer or complexing agent. The adhesive composition may also include or be used with a decomplexing agent, particularly one or more quaternary ammonium fluoride salts or one or more quaternary ammonium ether salts. A polymerization initiator or accelerator may also be used. The viscosity of the adhesive composition may be controlled by addition of a thickening agent which may be a polymer or copolymer catalyzed by a boron trifluoride complex or compound. Methods for the application of the adhesive compositions to living tissue are also provided.

An efficient method for the alkynylation of oxiranes using alkynyl boranes

Abstract: Alkynyl boranes, generated in situ from lithium acetylides and boron trifluoride etherate, were found to react with oxiranes under mild reaction conditions to afford β-hydroxyacetylenes in high yields

Cleavage of Ethers

Abstract: The scope and limitations of reagents for the cleavage of ethers are discussed. The reagents are conveniently classified in the five main headings. Selectivity patterns of some of the reagents are discussed in cases where sufficient data has been given in the literature. 1. Introduction 2. Acidic Reagents 2.1. Bronsted Acids 2.2. Lewis Acids 3. Basic Reagents 3.1. Alkali Hydroxides 3.2. Alkali Alkoxides 3.3. Alkali Amides 3.4. Alkali Metals 3.5. Organo-Alkali Metal Compounds 3.6. Sodium Cyanide/Dimethyl Sulfoxide 3.7. Sodium Ethanethiolate 3.8. Sodium Thiocresolate 3.9. Lithium Iodide 3.10. Sodium Benzeneselenolate 4. Miscellaneous Reagents 4.1. Iodotrimethylsilane 4.2. Iodotrichlorosilane 4.3. Dichloroiodomethylsilane 4.4. Bromotrimethylsilane 4.5. Alkylthiotrimethylsilanes 4.6. Ethanethiol or Ethanedithiol/Boron Trifluoride Etherate 4.7. Aluminium Halide/Thiol Systems 4.8. Acetyl Iodide and Pivaloyl Iodide 4.9. Diiodomethyl Ether/Hydrogen Iodide 5. Reductive Cleavage of Ethers 5.1. Lithium Tris[t-butoxy]aluminium Hydride/Triethylborane Complex 5.2. Hydrogenolysis 6. Oxidative Cleavage of Ethers 6.1. Ceric Ammonium Nitrate 6.2. Silver Oxide 6.3. Dichlorodicyanoquinone 6.4. Tris[p-bromophenyl]ammonium Hexachloroantimonate 7. Photochemical Cleavage of Ethers 8. Selectivity in Ether Cleavage 8.1. Stereoelectronic Characteristics of the Ether-Cleaving Agent 8.2. Structural Features of the Groups Cleaved 8.3. Molecular Environment of the C-O Bond not Undergoing Cleavage 9. Addendum

Homopolymerization of 2‐alkyl‐ and 2‐aryl‐2‐oxazolines

Abstract: 2-Aryl- and 2-alkyl-2-oxazolines have been polymerized to poly-(N-aroyl)aziridines and poly(N-acyl)aziridines, respectively, in the presence of boron trifluoride. The polymers obtained were glassy, light yellow resins with molecular weights ranging from 3500 to 7500 (35–50 oxazoline units per chain). The polymerization rates have been determined for several of these monomers. A polymerization mechanism is proposed.

BF3·SiO2: an efficient reagent system for the one-pot synthesis of 1,2,4,5-tetrasubstituted imidazoles

Abstract: Silica-supported boron trifluoride (BF3·SiO2) is an efficient, readily available and reusable catalyst for the synthesis of 1,2,4,5-tetrasubstituted imidazoles using benzil, an aromatic aldehyde and an amine in the presence of ammonium acetate. This one-pot procedure is very simple, affording good to excellent yields.