A5101913672- Crystallization and Solubility Studies
- Chemical Reactions and Mechanisms
- Asymmetric Synthesis and Catalysis
- Organic Chemistry Cycloaddition Reactions
- X-ray Diffraction in Crystallography
- Radical Photochemical Reactions
- Cyclopropane Reaction Mechanisms
- Catalysis and Oxidation Reactions
- Coordination Chemistry and Organometallics
- N-Heterocyclic Carbenes in Organic and Inorganic Chemistry
- Plant biochemistry and biosynthesis
- Asymmetric Hydrogenation and Catalysis
- Synthesis and Properties of Aromatic Compounds
- Organic and Inorganic Chemical Reactions
- Bioactive Compounds and Antitumor Agents
- Analytical Chemistry and Chromatography
- Molecular spectroscopy and chirality
- Synthesis and characterization of novel inorganic/organometallic compounds
- Fluorine in Organic Chemistry
- Pharmacological Effects of Medicinal Plants
- Organoboron and organosilicon chemistry
- Free Radicals and Antioxidants
- Catalytic Alkyne Reactions
- Oxidative Organic Chemistry Reactions
Colby College
2022-2024
Leipzig University
2013-2014
Photolysis of 1-(2-adamantylidene)-1a,9b-dihydro-1H-cyclopropa[l]phenanthrene in benzene (or benzene-d6) at ambient temperature produces adamantylidenecarbene. The carbene undergoes dimerization to a cumulene and may also be trapped stereospecific fashion by cis- trans-4-methyl-2-pentene. No products attributable 4-homoadamantyne, resulting from ring expansion the carbene, could detected. Coupled cluster/density functional theory calculations place singlet ∼49 kcal/mol below triplet show...
The low-temperature treatment of 1,1-dibromo-1a,9b-cyclopropa[l]phenanthrene with butyllithium appeared to produce dibenzonorcarynyliden(e/oid) which could be intercepted phencyclone a hindered spiropentane. spiropentane readily rearranges, thermally and photochemically, into triphenylene phenol derivative. its rearrangement product were characterized by X-ray crystallography.
Abstract 3‐O‐Acetyl‐11‐keto‐β‐boswelliasäure wurde aus pulverisiertem Weihrauchgranulat extrahiert und durch HPLC gereinigt. Alle analytischen Spektren sind vollständig entweder im Hauptteil oder in der supporting information wiedergegeben. Die NMR‐ sowie die Massenspektren werden eingehend interpretiert mit theoretischen Berechnungen 13 C‐chemischen Verschiebungen verglichen. Das Projekt stellt eine Fortsetzung des Buches “Classics Spectroscopy” von S. Berger D. Sicker (Wiley‐VCH 2009) dar.
Three polymorphs of the hydrocarbon 9-[(9H-fluoren-9-ylidene)methyl]phenanthrene have been isolated and characterized by single-crystal X-ray crystallography. Of these, one form displays conformational polymorphism with respect to other two, a phenomenon that is less common in simple hydrocarbons. The 5α form, obtained from an earlier fraction following purification column chromatography using hexanes as eluent, belonged monoclinic crystal system (space group P21/n) displayed twist angle...
To address the scarcity of generally applicable photochemical routes to allenylidenes in solution, phenanthrene-based sources have been investigated. Specifically, syntheses 1-vinylidene-1a,9b-dihydro-1H-cyclopropa[l]phenanthrene, 1-(2-phenylvinylidene)-1a,9b-dihydro-1H-cyclopropa[l]phenanthrene, and 1-(2-methylvinylidene)-1a,9b-dihydro-1H-cyclopropa[l]phenanthrene, precursors propadienylidene, 3-phenylpropadienylidene, 3-methylpropadienylidene carried out. Photolysis these new olefin traps...
Abstract Der Kork der Korkeiche ist ein faszinierendes Naturmaterial, das seit Antike genutzt wird. war 1665 auch Namensgeber für die “Zelle” in Biologie. Friedelin, kompliziertes pentacyclisches Triterpenketon, Korkbestandteil. Wir beschreiben seine Isolierung und berichten über Historie. Alle analytischen Spektren sind vollständig entweder im Hauptteil oder supporting information wiedergegeben. Die NMR‐ sowie Massenspektren werden eingehend interpretiert mit theoretischen Berechnungen 13 C...