Pentacyclic triterpenoids (PTs) constitute one of the biggest families of natural products, many with higher oxidation state at the D/E rings possess a wide spectrum of biological activties but are poorly accessible. Here we report a site-selective C-H hydroxylation at the D/E rings of PTs pa...
aThis is supported by the IR spectrum, in which bands corresponding to alkyl C–H stretching at ~ 3000 cm and Si–OR stretching at~ 1080 cmcan be observed 红外光谱支持这,对应于烷基C-H的带舒展在~ 3000 cm和Si或舒展at~ 1080 cmcan被观察 [translate] ...
Such conditions can shift the absorption spectrum into the visible region, resulting in a noticeable color of the complex. Table 2. Selected IR data of each ligand and its complexes (cm−1). 2.2. Photocatalytic Property Previous studies have demonstrated that uranyl(VI) can serve as an ...
The first high-resolution gas-phase spectrum of an arenium ion shows that the σ complex (not the π complex; see picture) is the most stable structure of C6H7+.关键词: arenium ions aromatic substitution carbocations IR spectroscopy reactive intermediates DOI: 10.1002/1521-3773(20021004...
(d1) The transient absorption spectrum of 0.3 mM CrBr3·6H2O solution. The spectrum was collected at 20 ns after photoexcitation with the gate width of 80 ns. The transient absorption spectrum of 0.15 mM liquid Br2 averaged in 30–100 ns after photoexcitation was shown for ...
(a) 1H NMR spectrum. (b) 13C NMR spectrum. starting 1p in 31% yield (Fig. 7a). Hence, the results obtained from the NMR experiments (Cp:Ap = 37:63) and those from the bench reaction (2af:1p = 38:62) suggested that nitrilium ion Ap was probably the only ...
The midinfrared spectrum of H 13 C 15 NO, an isotopically substituted species of fulminic acid, has been analyzed in the ranges 1800–3600 and 6300–7000cm 1 . More than 9000 infrared lines have been assigned, which makes it possible to identify more than 80 new vibrational levels. Power ...
reported a visible-light-driven α-C(sp3)–H alkylation of glycine derivatives with alkyl bromides in 2019 (Scheme 12) [83]. In this visible-light-driven reaction, [Ir(dF(CF3)ppy)2(dtbbpy)(PF6)] was chosen as the photocatalyst. Exploiting the appropriate photoredox potential of the Ir ...
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