Results 311 to 320 of about 859,806 (359)

The chemistry of (ring)Ru2+ (ring = tetramethylthiophene, p-cymene)

Organometallics, 1991
Described are the compounds ((ring)Ru(OTf){sub 2}){sub x}, where ring = 2,3,4,5-tetramethylthiophene (TMT, 1), and p-cymene (2). These electrophilic reagents serve as precursors to ((ring)RuL{sub 3}){sup 2+}, where L{sub 3} = (H{sub 2}O){sub 3}, (NH{sub 3}){sub 3}, and (PH{sub 3}){sub 3}. Solutions of 1 and 2 react with carbon monoxide to give (ring)Ru(
Edward A. Ganja, Thomas B. Rauchfuss, Charlotte L. Stern   +2 more
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Coordination Chemistry of Open-Ring Hemiporphyrazines

ECS Meeting Abstracts, 2023
Hemiporphyrazines, phthalocyanine analogues consisting of two isoindoline subunits and two pyridine or other aromatic subunits, have attracted considerable interest not only from the viewpoint of their fundamental properties but also in materials science.
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Equilibria in Organo Antimony Ring Chemistry

Phosphorus, Sulfur, and Silicon and the Related Elements, 1992
Abstract Reactions of ethyl antimony and n-propyl antimony rings give equilibria with the mixed substituted derivatives R(n-m)R′mSbn (n = 4, m=1-3; n=5, m=1-4; R=Et, R′= n-Pr). The equilibrium constant K = [(EtSb)4]5/[(EtSb)5]4 has been determined as K = 9.10−8 mol/l. Air oxidation of p-TolSb(SiMeo3)2 gives yellow crystals of p-tolylantimony.
H. J. Breunig, S Gülec, R. Kaller
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Ring‐Transformation Graphs in Heterocyclic Chemistry

Bulletin des Sociétés Chimiques Belges, 1992
AbstractA novel graph‐theoretical and topological approach is suggested for the description and classification of a great number of simple ring‐transformation reactions of heterocycles. The suggested ring‐bond‐redistribution graphs (which can be easily obtained from the known mechanisms of rearrangements or recyclizations) visualize the degree of ...
Eugeny V. Babaev, Nikolai S. Zefirov
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Unusual ring systems in organic chemistry

Naturwissenschaften, 1977
In this article several compounds with unusual ring systems are surveyed briefly. Saturated and unsaturated monocyclic compounds, polycyclic compounds, and unconventional aromatic systems are covered. The reasons for the interest of organic chemists in the unusual ring systems are discussed.
Hanack, Michael, Subramanian, L. R., Eymann, Wolfgang   +2 more
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Ring expansion reactions in organonickel chemistry

Journal of the Chemical Society D: Chemical Communications, 1970
In contrast with the reactions of NiL4(L = tertiary phosphine), Ni(ButNC)4 reacts with (CF3)2CO and (CF3)2CNH to give five-membered-ring compounds (ButNC)2[graphic omitted](X = O or NH) in an almost stereoselective 3- to 5-ring transformation.
A. Greco, M. Green, S. K. Shakshooki, F. G. A. Stone   +3 more
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Ring Transformations in Tetrazole Chemistry

Journal f�r Praktische Chemie/Chemiker-Zeitung, 1998
Transformations of heterocycles into tetrazoles as well as conversions of the latter into other rings are reviewed. The literature is covered through early 1998 (material that has been surveyed by Van der Plas [1] and Benson [2] is resumed in abridged fashion).
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ChemInform Abstract: 1‐AZIRINE RING CHEMISTRY

Chemischer Informationsdienst, 1978
AbstractSynthese und Reaktionen von 1‐Azirinen werden untersucht.
V. NAIR, K. H. KIM
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Chemistry of the solanidane ring system

Journal of the Chemical Society C: Organic, 1971
The reaction of acetyldemissidine and acetylsolanidine with cyanogen bromide is described and the results of the lithium aluminium hydride reduction of the bromo-cyanamides so produced are discussed. The hydrolysis of acetyldemissidine bromo-cyanamide under very mild conditions caused a retro-von Braun reaction to afford the initial alkaloid.
J. A. Beisler, Y. Sato
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Medium-ring diphosphines: synthesis and transannular chemistry

Coordination Chemistry Reviews, 1998
Abstract Medium-ring diphosphines offer unique opportunities to study the interactions between phosphorus atoms. In addition, monocyclic medium-ring diphosphines may be very useful ligands in transition metal complexes. A number of useful synthetic routes to these compounds have been developed, but further efforts in this direction might be rewarding.
Alder, RW, Read, D
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