Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
7810779 | Journal of Molecular Structure | 2013 | 11 Pages |
Abstract
Structural analyses of a series of 5-alkyl-[1,3,5]-dithiazinanes [R = Me (1), iPr (2), tBu (3)], their N-BH3 adducts (1BH3-3BH3) and their 2-alkyl (Râ²) derivatives are reported: R = Me, Râ²Â = Me (7); R = Me, Râ² iPr (8); R = iPr, Râ²Â = Me (10); R = tBu, Râ²Â = Me (11); and R = Me, Râ²Â = nBu (12). The reaction of 2-lithium-5-methyl-[1,3,5]-dithiazinane (4) with I2 affords the bis-(5-methyl-[1,3,5]-dithiazinan-2-yl) (13). Isostructural compounds: [2,5,5]-trimethyl-[1,3,5]-dithiazinan-5-ium iodide (14), 5-borane-2,5-dimethyl-[1,3,5]-dithiazinane (15) and 2,5,5-trimethyl-[1,3,5,6]-dithiazaborata (16) are compared. Structures of 7, 8 and 10-13 were determined by 11B, 13C and 1H NMR and the X-ray diffraction analyses of 2, 1BH3, 13 and 14 are reported. Optimization of two chair conformers of heterocycles 1-3, 1BH3-3BH3, 7, 9 (R = Me, Râ²Â = tBu), 13-16 were performed by HF/6-31++G and B3LYP/6-31G(d,p) methods and their minimum energy is compared. 2-Alkyl substituents or N-BH3 anchor the [1,3,5]-dithiazinane ring conformation allowing the analyses of steric and electronic interactions as well as the lone pairs effect in these molecules.
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Physical Sciences and Engineering
Chemistry
Organic Chemistry
Authors
Angelina Flores-Parra, Carlos Guadarrama-Pérez, Juan Carlos Gálvez Ruiz, Sonia A. Sánchez Ruiz, Galdina V. Suarez-Moreno, Rosalinda Contreras,