| | 1 | Author
| Rolf Gleiter, Richard Bartetzko | Requires cookie* | | | Title
| The Structures of S4N e , S3N202 and S4N3 e  | | | | Abstract
| Part of the potential surface of S4N e has been investigated using the MNDO method. It is found that the cis-trans isomer lb is more stable by 20-30 kJ/mol than the trans-trans isomer (1 c) and the cis-cis isomer (1 a). The stability of 1 b is traced back to stabilization of the HOMO and to a Coulomb attraction. For S3N2O2 (2) the MNDO calculations favour those isomers (2a and 2b) with two sickle-like arrangements for the same reasons. For S4N3 e (3) only one isomer (3a) is favoured due to the stabilization of the HOMO. The similarity in the transannular interaction present in 1-3 and that in trithiapentalenes and related compounds is pointed out. The PE spectrum of 2 has been reinvestigated. The first five bands can be interpreted by comparison between the measured ionization potentials and the calculated (MNDO) orbital energies. | | | |
Reference
| Z. Naturforsch. 36b, 492—497 (1981); received December 22 1980 | | | |
Published
| 1981 | | | |
Keywords
| Structural Isomers, MNDO Calculations, Transannular Interactions | | | |
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| default:Reihe_B/36/ZNB-1981-36b-0492.pdf | | | | Identifier
| ZNB-1981-36b-0492 | | | | Volume
| 36 | |
| 2 | Author
| Bernhard Glaser, ErwinP. Mayer, Heinrich Nöth, Wilfried Rattay, Ulrich Wietelmann | Requires cookie* | | | Title
| Beiträge zur Chemie des Bors, 190 [1] Synthese und Molekülstruktur von 1,2-Dihydroboreten und Azadiboretidinen Contribution to the Chemistry of Boron, 190 [1] Synthesis and Molecular Structure of 1,2-Dihydrodiboretes and Azadiboretidines | | | | Abstract
| [2+2]-Cycloadditions of 9-Fluorenylidentetramethylpiperidinoboranes have been studied with selected olefines, acetylenes and iminoboranes. No reactions with olefines were observed. While propiolic methylester reacts exclusively at the carbonyl bond producing the oxaboretane 5, alkines such as diethylamino-alkines, cyclo-octine and phenylacetylene provide access to the'1,2-dihy-droboretenes 6, 3 and 2. Tetramethylpiperidinoiminoboranes make 1.2.4-azadiboretidines 7 available. 6a and 7a contain a folded four-membered ring as shown by X-ray structure analysis. There is only a weak 1,3-intraannular interaction due to BN-;r-bonding of the boron atoms with their exocyclic amino group. | | | |
Reference
| Z. Naturforsch. 43b, 449—456 (1988); eingegangen am 10. Dezember 1987 | | | |
Published
| 1988 | | | |
Keywords
| Reactivity of Aminomethyleneboranes, Transannular Interaction, X-Ray, 1, 2-Dihydroboret Derivatives, 1, 24-Azadiboretidine Derivatives | | | |
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| default:Reihe_B/43/ZNB-1988-43b-0449.pdf | | | | Identifier
| ZNB-1988-43b-0449 | | | | Volume
| 43 | |
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