Reactions of lithiooxazole

JC Hodges, WC Patt, CJ Connolly

文献索引：Hodges, John C.; Patt, William C.; Connolly, Cleo J. Journal of Organic Chemistry, 1991 , vol. 56, # 1 p. 449 - 452

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被引用次数: 71

摘要

Conclusions The structure of 3b, the first 3-exo-methylene isomer of a cephalosporin to have its structure determined by X-ray crystallography, has been shown to be quite ordinary in terms of the length and orientation of the carbon-carbon double bond. This isomer was determined to lie 4.55 kcal/mol above its cephalosporin isomer, lb. Of the three common semiempirical molecular orbital methods, AM1 was found to provide the best agreement ...