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Observations of ozone and related species in the northeast Pacific during the PHOBEA campaigns 1. Ground-based observations at Cheeka Peak
Regulierung von RapsschĂ€dlingen im ökologischen Winterrapsanbau durch den Einsatz naturstofflicher Pflanzenschutzmittel sowie durch den Mischanbau mit RĂŒbsen (Brassica rapa)
Structure-Based Rationale for Selectivity in the Asymmetric Allylic Alkylation of Cycloalkenyl Esters Employing the Trost âStandard Ligandâ (TSL): Isolation, Analysis and Alkylation of the Monomeric form of the Cationic η3-Cyclohexenyl Complex [(η3-c-C6H9)Pd(TSL)]+
Phosphine-Catalyzed Formation of Carbon-Sulfur Bonds: Catalytic Asymmetric Synthesis of gamma-Thioesters
Supporting Information Available: Experimental procedures and compound characterization data. This material is available free of charge via the Internet at http://pubs.acs.org.A method for catalytic asymmetric Îł sulfenylation of carbonyl compounds has been developed. In the presence of an appropriate catalyst, thiols not only add to the Îł position of allenoates, overcoming their propensity to add to the ÎČ position in the absence of a catalyst, but do so with very good enantioselectivity. Sulfur nucleophiles are now added to the three families of nucleophiles (carbon, nitrogen, and oxygen) that had earlier been shown to participate in catalyzed Îł additions. The phosphine catalyst of choice, TangPhos, had previously only been employed as a chiral ligand for transition metals, not as an efficient enantioselective nucleophilic catalyst.National Institutes of Health (U.S.)National Institute of General Medical Sciences (U.S.) (R01-GM57034)Merck & Co.Novartis (Firm
X-ray crystallographic structure of 3-(Propan-2-ylidene) benzofuran-2(3H)-one
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A Guide to Directing Group Removal: 8âAminoquinoline
The use of directing groups allows high levels of selectivity to be achieved in transition metalâcatalyzed transformations. Efficient removal of these auxiliaries after successful functionalization, however, can be very challenging. This review provides a critical overview of strategies used for removal of Daugulisâ 8âaminoquinoline (2005â2020), one of the most widely used N,Nâbidentate directing groups. The limitations of these strategies are discussed and alternative approaches are suggested for challenging substrates. Our aim is to provide a comprehensive endâusersâ guide for chemists in academia and industry who want to harness the synthetic power of directing groupsâand be able to remove them from their final products
Coherent states for polynomial su(1,1) algebra and a conditionally solvable system
In a previous paper [{\it J. Phys. A: Math. Theor.} {\bf 40} (2007) 11105],
we constructed a class of coherent states for a polynomially deformed
algebra. In this paper, we first prepare the discrete representations of the
nonlinearly deformed algebra. Then we extend the previous procedure
to construct a discrete class of coherent states for a polynomial su(1,1)
algebra which contains the Barut-Girardello set and the Perelomov set of the
SU(1,1) coherent states as special cases. We also construct coherent states for
the cubic algebra related to the conditionally solvable radial oscillator
problem.Comment: 2 figure
Ying and Yang interplay between reactive oxygen and reactive nitrogen species controls cell functions
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