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• W2100020016 endingPage "1159" @default.
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• W2100020016 abstract "Two conceptually different routes to transient 1,2-diselones are reported: 1) via ring fragmentation of the 1,4,2-diselenazine system 6, and 2) by the tributylphosphane-induced depolymerisation of the shelf-stable organoselenium polymer 15. Evidence for the intermediacy of 1,2-diselone species 7 and 16 is provided in both cases by in situ trapping with dimethyl acetylenedicarboxylate (DMAD) to yield 1,4-diselenin derivatives. The route via 15 is especially expedient and trapping of 16 is efficient. Subsequent reactions of adduct 17 afford [1,2-ethanediylbis(diphenylphosphane)] [5,6-bis(methoxycarbonyl)-1,4-diselenin-2,3-dithiolato]nickel(IV) (20). Theoretical calculations at Hartree-Fock (HF) and Moller-Plesset electron-correlated levels (MP2) suggest that the cyclic 1,2-diselenete structure 7c is significantly more stable than the acyclic 1,2-diselone structure 7a. For the bicyclic system 16, the difference in energy between the cyclic and acyclic structures is considerably reduced due to the conformational rigidity imposed by the fused 1,3-dithiole ring. In contrast, the acyclic structures of the 1,2-dithione analogues 13a and 25a are computed to be more stable than their corresponding cyclic 1,2-dithiete structures 13c and 25c." @default.
• W2100020016 created "2016-06-24" @default.
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• W2100020016 date "2000-04-03" @default.
• W2100020016 modified "2023-09-26" @default.
• W2100020016 title "Synthesis and Trapping of Transient 1,2-Diselones To Yield 1,4-Diselenin Derivatives: Calculated Structures of 1,2-Diselones, 1,2-Diselenetes and Their Sulfur Analogues" @default.
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• W2100020016 doi "https://doi.org/10.1002/(sici)1521-3765(20000403)6:7<1153::aid-chem1153>3.3.co;2-e" @default.
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