994 resultados para Berr, Georges (1867-1942)


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This research work has been planned with the intention of proving the absolute configuration of lactobacillc acid. During the course of this work, attempts have been made to synthesize cis-2-carboxycyclopropane- l-.acetic acid as,v,a suitable resolvable material. As the results were not satisfactory, the synthesis of ci,s-2-carboxycyclopropane-l-propionic acid has been alternatively attempted by ring opening of bicyclo- [4.1.~-heptan-2-onewithout much success. Attempts to resolve or prepare bicyclo[ 4.1.~-hePtan-2-one optically active are also reported. On the other hand, a complete scheme is described for the possible synthesis of optically active lactobacillic acid. If only bicyclo- ~.1.~ -heptan-2-one can be resolved or prepared optically active, this described scheme can be applied smoothly to the synthesis of enant~omeric lactobacillic acid.

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Photographico portrait of Charles Clarke Chapman, Taken by Bob Gamble, Hollywood, California, 1942

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Studio portrait of Charles Clarke Chapman, taken by the Edwards-Hostetler studio, Los Angeles, California, 1942. Signed on photo mount "Sincerely Yours, Charles C. Chapman."

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Original mounted photograph, signed by the photographer [Hartsook], as well as by C. C. Chapman [Affectionately yours, Father], ca. 1942.

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At head of title: By Authority.