Abstract
Synthesis and Properties of 1,2,4,3‐Thiadiazaboretidines. Crystal Structure of 2,4‐Di‐tert‐butyl‐3‐phenyl‐1,2,4,3‐thiadiazaboretidineReaction of sulfur diimides with alkyl(aryl)bis(methylthio)boranes leads to reductive 1,3‐cycloaddition of the NSN sequence with formation of the 1,2,4,3‐thiadiazaboretidines 2a‐g. NMR (1H, 11B, 13C, 15N, 29Si), mass spectra and the results of the X‐ray analysis of 21 are reported and discussed. The 11B chemical shifts have been calculated for 3‐phenyl‐1,2,4,3‐thiadiazaboretidine and some related model compounds by the IGLO method and correlate acceptably with the experimental values.
Highlights
Institut fur Anorganische Chemie der Universitat Gottingen ', TammannstraDe 4, D-3400 Gottingen Institut fur Organische Chemie der Universitat Erlangen-Niirnberg', HenkestraDe 42, D-8520 Erlangen
Reaction of sulfur diimides with alkyl(aryl)bis(methylthio)bor- shifts have been calculated for 3-phenyl-1,2,4,3-thiadiazaboranes leads to reductive 1,bcycloadditionof the NSN sequence etidine and some related model compounds by the IGLO with formation of the 1,2,4,3-thiadiazaboretidine2sa- g
Die Wasserstoff-Atome wurden isotrop und ihre Auslenkungsparameter in lquivalenten Gruppen frei verfeinert
Summary
Institut fur Anorganische Chemie der Universitat Gottingen ', TammannstraDe 4, D-3400 Gottingen Institut fur Organische Chemie der Universitat Erlangen-Niirnberg', HenkestraDe 42, D-8520 Erlangen. Wie kurzlich gezeigt'), reagiert 3,5-Dimethyl-l,2,4,3,5-tri-Ergebnisse und Diskussion thiadiborolan mit Di-tert-butylschwefeldiimid zunachst zum Schwefeldiimidereagieren mit Alkyl(Aryl)bis(methylthio)1,4,2,6,3,5-Dithiazadiborina1na, das von weiterem Schwe- boranen zu 1,2,4,3-Thiadiazaboretidinen[2]. Die Umsetzung erfolgt unter Reduktion des DiimidSchwefel-Atoms und 1,3-Cycloaddition der DiaminosulfanEinheit an das Bor-Atom. Die Reaktionen sind in der Kalte (- 78"C)durchzufiihren, da bei Raumtemperatur oder unter Riickflufibedingungen und ohne Losungsmittel nur Polykondensate entstehen, deren Bildung in der Kalte gemaI3 G1. Die EI-Massenspektren der Thiadiazaboretidine zeigen Molekulpeaks mit nur mittleren relativen Intensitaten (17--53%).
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