47,203 research outputs found
John C. Beckmann
No full textPhotograph shows photographic reproduction of a painting of John C. Beckmann
John C. Beckmann with daughter-in-law and grandsons, 1907
No full textPhotograph shows John Conrad Beckmann (seated center) with daughter-in-law Marie Guenther Beckmann and four of her children (l. to r.) Kurt, Regina, Albert, and Werner Beckmann.Names and date on album page
Photoinduced C—C Bond Cleavage and Oxidation of Cycloketoxime Esters
No full textA novel structural reorganization of cycloketoxime esters beyond the traditional Beckmann rearrangement process has been established to build cyano-containing ketones in the presence of photocatalyst. This novel transformation is remarkable with selective C—C bond cleavage and an oxidation process enabled by DMSO used as the solvent, oxidant, and oxygen source avoiding acid, base and toxic cyanide salts as the cyano source. Further applications in late-stage modification of complex and chiral molecules have also been reported
Beckmann, John (Death, 1907-10-28)
No full textAddress: 2120 OhioAge at death: 72 yrs.388/Pg 115/1907/M W Wr./Germany/Dr. C. A. Hammel/H. Imwalle & Son/St. Mary'sOriginal record filed in drawer labeled 'BECKMANN-BIERLE'
Letter from C. H. Gensler, Havasupai Agency to Carl Hayden
No full textLetter from C. H. Gensler expressing concern on behalf of the Havasupai Tribe regarding the proposed park boundaries
Citations of the author H C Rajpoot
No full textThe list of the articles, research papers, theses, and book chapters globally citing the author H. C. Rajpoot</p
Letter from Carl Hayden to C. H. Gensler
No full textLetter from Carl Hayden to C. H. Gensler informing him of the proposed Grand Canyon National Park bill
Letter from C. H. Gensler, Havasupai Agency to Carl Hayden
No full textLetter from C. H. Gensler to Carl Hayden asking for a meeting in regards to the Havasupai pasture land in light of the national park bill
Radical Beckmann Rearrangement and Its Application in the Formal Total Synthesis of Antimalarial Natural Product Isocryptolepine via C–H Activation
No full textThe
Beckmann rearrangement of ketoximes, mediated by ammonium persulfate-dimethyl
sulfoxide as a reagent, has been achieved under neutral conditions.
Based on the radical trapping and 18O-labeling experiments,
the transformation follows a mechanism involving a radical pathway.
The scope and generality of the developed protocol has been demonstrated
by 19 examples. The developed protocol and Pd-catalyzed intramolecular
double C–H activation were used as key steps in the formal
total synthesis of antimalarial natural product isocryptolepine
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