982 resultados para 13C corrected


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Added title-pages, engraved, with vignettes.

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"War Department. Document no. 394. Office of the Chief of Staff"--Verso of t.p.

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Mode of access: Internet.

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Added title-pages, engraved (with vignette) : The plays of William Shakspeare, illustrated with engravings by George B. Ellis, from the designs of R. Smirk, R. A.

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Compare, Library Company of Philadelphia. Afro-Americana, 1553-1906, entry 5755.

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The C-13 NMR data of five iminopropadienones R-N=C=C=C=O as well as carbon suboxide, C3O2, have been examined theoretically and experimentally. The best theoretical results were obtained using the GIAO/B3LYP/6-31 +G**//MP2/6-31G* level of theory, which reproduces the chemical shifts of the iminopropadienone substituents extremely well while underestimating those of the cumulenic carbons by 5-10 ppm. The computationally faster GIAO/HF/6-31 + G**//B3LYP/6-31 G* level is also adequate. (C) 2004 Elsevier B.V. All rights reserved.