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- W2028888967 abstract "Mit dem Ziel der Synthese von Chinhydronen der [3.3]Metacyclophan-Reihe (z. B. 1 und 2) wurden die stereoisomeren 7,10,17,20-Tetramethoxy-2,13-dithia[4.4]metacyclophane (5/6) über die Vorstufen 8 – 12 synthetisiert. Aus den durch Oxidation von 5/6 erhaltenen Disulfonen entstanden durch Gasphasen-Vakuum-Pyrolyse (570°C/10−4 Torr) zwei stereoisomere 6,9,15,18-Tetramethoxy[3.3]metacyclophane, deren Zuordnung zur syn-Konstitution 3 und anti-Konstitution 4 aufgrund der 1H-NMR-Spektren getroffen wurde. Wie Versuche zur thermischen Isomerisierung zeigen, ist die konformative Stabilität von 3/4 wie auch von 5/6 bemerkenswert groß. – Als Nebenprodukte der Cyclisierung von 11 und 12 bzw. der Sulfon-Pyrolyse wurden die Verbindungen 13 – 16 isoliert. Electron Donor-Acceptor Compounds, XIX. Intramolecular Quinhydrones of the [3.3]Metacyclophane Series: syn- and anti-6,9,15,18-Tetramethoxy[3.3]metacyclophanes as Precursors In the context of the synthesis of [3.3]metacyclophane quinhydrones (e. g, 1 and 2) the stereoisomeric 7,10,17,20-tetramethoxy-2,13-dithia[4.4]metacyclophanes (5/6) were synthesized via 8 – 12. From the disulfones, prepared by oxidation of 5/6, by vacuum gas-phase pyrolysis (570°C/10−4 Torr) two stereoisomeric 6,9,15,18-tetramethoxy[3.3]metacyclophanes were obtained the assignment of which to the syn-constitution 3 and the anti-constitution 4 has been made on the basis of 1H NMR spectra. As experiments on thermal isomerisation show the conformational stability of 3/4 as well as 5/6 is remarkably high. – As side-products of the cyclisation of 11 and 12, and of the sulfone pyrolysis, resp., the compounds 13 – 16 were isolated." @default.
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- W2028888967 title "Elektron-Donor-Acceptor-Verbindungen, XIX. Intramolekulare Chinhydrone der [3.3]Metacyclophan-Reihe:syn- undanti-6,9,15,18-Tetramethoxy[3.3]metacyclophane als Vorstufen" @default.
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- W2028888967 doi "https://doi.org/10.1002/cber.19801130124" @default.
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