High-resolution solid-state magic angle spinning (73)Ge NMR spectra of some organogermanium compounds were measured. Most tetrasubstituted germanes with identical substituents exhibited signals except for one case. Tetrasubstituted germanes with two kinds of different but somewhat similar substituents exhibited broad peaks. Trisubstituted germanes failed to show signals, indicating the importance of symmetry around germanium.
Photooxygenation of silyl-modified azafulleroids 1b and 1c gave open-cage fullerenes having keto lactam 2b and 2c or diketo imide 3b and 3c functional groups on 11- or 15-membered ring orifices. The high reactivity of the bridgehead double bonds was estimated by π-orbital axis vector (POAV) analysis comparing the bisfulleroid derivatives 5d, 5e, 6d, and 6e.
ditions. -Addition of a saturated amount of anhydrous sodium sulfate significantly improves the tungsten-catalyzed H2O2 epoxidation to give acid-labile epoxides in high yields. The effect is explained by suppression of hydrolysis without deactivation of the catalytic system. -(HACHIYA, H.; KON*, Y.; ONO, Y.; TAKUMI, K.; SASAGAWA, N.; EZAKI, Y.; SATO, K.; Synthesis 2012, 11, 1672-1678, http://dx.doi.org/10.1055/s-0031-1290948 ; Natl. Inst. Adv. Ind. Sci. Technol., Ibaraki, Tsukuba 305, Japan; Eng.) -Mais 38-032
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