Results 121 to 130 of about 953 (169)

Stereocontrolled approach to quinuclidine derivatives

Tetrahedron Letters, 1998
Abstract Asymmetric Michael-type cyclization of chiral enamino ester (S)-7 furnished the quinuclidinone derivative (3R, 4S)-5, with a high degree of stereoselectivity.
Alexandre J. Da Silva Goes, Christian Cavé, Jean d'Angelo   +2 more
openaire   +1 more source

Molecular aggregates of quinuclidine and chlorophyll a

SPIE Proceedings, 1991
A slightly polar molecule quinuclidine seems to form weakly bound aggregates in concentrated water solutions. Molecular dynamics simulation of a 6 mol water solution indicates clustering of quinuclidine molecules into an almost spherical structure with polar ends of the molecules pointing towards the solvent.
Jouko E. Korppi-Tommola, Aulis Hakkarainen, Vesa M. Helenius   +2 more
openaire   +1 more source

Study of the tautomerism of 2-ethoxycareonyl-3-oxo derivatives of quinuclidine and benzo[b]quinuclidine

Chemistry of Heterocyclic Compounds, 1972
The tautomerism of 2-ethoxycarbonyl-3-oxoquinuclidine and 2-ethoxycarbonyl-3-oxobenzo-[b]quinuclidine was investigated by means of IR and UV spectra and potentiometric titration. It was found that tautomeric equilibrium between the ketone, enol, and internally ionized forms is realized for 2-ethoxycarbonyl-3-oxoquinuclidine, and the position of the ...
Yu. N. Sheinker, E. M. Peresleni, I. V. Persianova, E. E. Mikhlina, V. Ya. Vorob'eva, A. D. Yanina, L. N. Yakhontov   +6 more
openaire   +1 more source

Novel heterocyclic derivatives of quinuclidine

Journal of Heterocyclic Chemistry, 1967
AbstractTreatment of ethyl 3‐quinuclidinone‐2‐carboxyIate (III) with appropriate reagents gave 2,3‐fused heterocycles including pyrazolol, aminopyrimidinone, and aminopyridazinone types. The thiourea derivative of III could not be cyclized. Triazoline, pyrazoline, and isoxazoline derivatives were prepared by 1,3‐dipolar cycloadditions to the 2‐ and 3 ...
William A. Renters, Gabriel J. Gibs, Martin J. Weiss   +2 more
openaire   +1 more source

Mass spectra of the substituted quinuclidines

Organic Mass Spectrometry, 1970
AbstractThe mass spectra of the quinuclidine‐2 (and ‐3)‐ones and other functional derivatives of quinuclidine as well as 2‐azaquinuclidine and benzoquinuclidine have been investigated. The fragmentation through the open form of the molecular ion and the applicability of Bredt's rule to amine fragmentation of the bridgehead nitrogen bicyclic systems are
R. G. Kostyanovsky, E. E. Mikhlina, E. I. Levkoeva, L. N. Yakhontov   +3 more
openaire   +1 more source

Quinuclidine∑boranes as Intermediates in Formation and Isolation of Functionalized Quinuclidine Systems

HETEROCYCLES, 1987
Philip L. Stotter, Martin D. Friedman, Gordon O. Dorsey, Robert W. Shiely, Robert F. Williams, David E. Minter   +5 more
openaire   +1 more source

Quinuclidine analogs of tobacco alkaloids

Journal of Medicinal Chemistry, 1971
F D, Reed, A, Burger
openaire   +2 more sources

A simple synthesis of quinuclidine

Collection of Czechoslovak Chemical Communications, 1951
R. Lukeš, M. Ferles
openaire   +1 more source

Quinuclidin-4-yl

Journal of the American Chemical Society, 1979
Shelton Bank, William K. S. Cleveland, D. Griller, K. U. Ingold   +3 more
openaire   +2 more sources

A New Synthesis of Quinuclidine

The Journal of Organic Chemistry, 1962
Stanley Leonard, Samuel Elkin
openaire   +1 more source