Über die Bedeutung zyklischer Säuren und Alkohole für die Chemotherapie der Lepra. I. Mitteilung: Ester der Δ2-Zyklopentenylessigsäure und des β-Δ2-Zyklopentenyläthanols.
Observations on the direct amidocyclopropanation of alkenes using organozinc carbenoids
作者:William B. Motherwell、Guillaume Bégis、David E. Cladingboel、Laure Jerome、Tom D. Sheppard
DOI:10.1016/j.tet.2007.03.027
日期:2007.7
A series of amidocyclopropanes were prepared by directamidocyclopropanation of alkenes, usingorganozinccarbenoids generated from readily available diethoxymethylamides. The amidocyclopropanation of monosubstituted alkenes led to selective formation of the trans-amidocyclopropane in most cases, but with more substituted alkenes, the stereochemical outcome of the cyclopropanation reactions was unpredictable
Sequential Free Radical Reactions with Xanthates: Cyclopentane Ring Annulation
作者:V. Maslak、ž. Čeković、R. N. Saičić
DOI:10.1055/s-1998-1946
日期:1998.12
In the presence of electron-rich alkenes, electro- and ambiphilic homoallylic radicals, generated by homolytic decomposition of the corresponding xanthates, undergo annulation with inverse electron-demand, and afford cyclopentane derivatives in moderate to good yields.
The invention relates to fragrant mixtures comprising at least one compound of general formula (I), a method for producing claimed fragrant mixtures, particularly perfume oils, perfumed products containing the claimed fragrant mixture, and the use of the compound of general formula (I) to strengthen the natural freshness and/or emanation and/or to mask or reduce greasy and/or metallic notes of one or more fragrant substances that differ from the compound of formula (I).
Asymmetric Catalysis by Vitamin B12: The isomerization of achiral cyclopropanes to optically active olefins
作者:Thomas Troxler、Rolf Scheffold
DOI:10.1002/hlca.19940770502
日期:1994.8.10
Achiral spiroactivated cyclopropanes are isomerized to opticallyactive (R)-(cycloalk-2-enyl)-Meldrum's acids ( = (R)-5-(cycloalk-2-enyl)-2,2-dimethyl-1,3-dioxane-4,6-diones) in high yield and ee's up to 86% by catalytic amounts of cob(I)alamin in polar protic solvents.
Beschrieben wird eine Riechstoffmischung, vorzugsweise Parfümöl, umfassend die Bestandteile (a) (Cyclopent-2-enyl-essigsäureethylester)
sowie zusätzlich (b) einen oder mehrere Riechstoffe, vorzugsweise mit einer blumigen Geruchsnote, aus der Gruppe bestehend aus Alkoholen und Aldehyden mit einer Molmasse von 210 g/mol oder weniger und/oder (c) einen oder mehrere Riechstoffe aus der Gruppe bestehend aus Ketonen, Ethern und Estern mit einer Molmasse im Bereich von 190 g/mol bis 250 g/mol.