2,6- and 2,7-Dioxabicyclo[2.2.1]heptanes

Synthesis and Polymerization of 2,6,7-Trioxabicyclo[2.2.1]heptane and 1-Methyl-2,6,7-trioxabicyclo[2.2.1]heptane

“…1%. 6 All signals are singlets on a 60 MHz NMR. c Contrary to the other compounds shown in this table, these chemical shifts were determined from the spectra of their isomeric mixtures.…”

“…These results are very important in dis- a Upper, methanol-insoluble polymer; lower, methanol-soluble and n-pentane-insoluble polymer. 6 VPO, tetrahydrofuran, 37 C. 3 Calculated from the 1H NMR spectra.…”

Synthesis and Polymerizability of Atom-Bridged Bicyclic Monomers

“…[20] 2.4. Lactones (31)(32)(33)(34)(35)(36)(37)(38) and Carbonates (39)(40) Lactones (Table 4) can undergo "uncoordinated" anionic polymerization, but "coordinated" anionic polymerization, in which the addition of a Lewis acid of a metal like aluminum, tantalum, or titanium provides simultaneous Lewis acid-base activation, is much more selective and does not lead to reshuffling of the polymer chains. The lactone monomers are synthesized by loss of small molecules from hydroxyacids or hydroxyesters.…”

“…Crucial to the success of these reactions was removal of the sensitive acetal by distillation under reduced pressure as it formed [38][39][40][41]. This topic has been reviewed [42][43][44].…”

Synthesis and Reactions of 1,4‐Anhydrogalactopyranose and 1,4‐Anhydroarabinose – Steric and Electronic Limitations

“…To achieve a better understanding of this system, model calculations on a simple unsubstituted bicyclic compound were performed. For this purpose, we selected 2,7-dioxabicyclo[2.2.1]heptane as the core structure of 1,4-anhydro sugars [10]. Geometry optimization was carried out using density functional theory (DFT; B3LYP/6-311G(d)) [11] [12] and the Gaussian03 program package [13].…”