A wide range of basic reagents such assodiummethoxide,triethylamine,potassium fluoride, and so on can promote the Henry reaction. SomeLewis acidssuch astrimethylsilyl chloridealso catalyze the Henry reaction by activating thecarbonyl compoundsunder mild acidic conditions. Inexpensivenitromethaneis the most ...
picosecond IR pump-probe measurementsvibrational relaxationPicosecond infrared pump–probe measurements of the vibrational relaxation of the nitro (NO 2 ) functional group asymmetric stretch (1580 cm 1 ) of several molecules used in energetic materials, TNAZ, RDX, HMX, and CL-20 (abbreviations ...
All aqabamycins are yellow with UV absorptions in the range of 360–400 nm. Besides 1a, all aqabamy- cins are nitrated, but unexpectedly, the influence of the nitrophenol unit on the long wavelength absorption is low. The 1H NMR spectra are remarkably simple and showed only signals in ...
NPCDDs absorb with moderate intensity at 300 nm (log E = 3) with shoulders near 360 nm due to the nn* transition centred on the nitro group. We have previously shown that NPCDDs photolyze rapidly at 300 nm in the presence of dilute sodium hydroxide (7). The photolyzates from the ...
Vibrational, electronic and conductivity characteristics. To have an idea about the functional groups verified on the as-synthesized catalysts, FT-IR spectroscopic examination was carried out in the wavelength range of 4000–400 cm−1 connected to the Mn–O (Fig. 4). The FT-IR ...
respiratory minute volume for rats. The absorption of nitroethane by the URT was linear over a 10-fold exposure range. During exposures only 2.8 and 2.0% of nitroethane was excreted from the URT and LRT, respectively. Porter and Bright (1977) showed that nitroethane is readily converted by ...
Moreover, the effects of a double Azo group, and increasing the length of π-conjugation by reducing band gap trough heterocycle rings (donor-donor-π-acceptor system) and Nitro anchoring group were investigated. Nitro groups disappeared in IR at about 1340 and 1598cm 1 which indicates that ...
Grafting 2 [Mo(NAr)(CHCMe2R1)(NR2)2] on SiO2-(700) gives selectively [(SiO)Mo(NAr)(CHCMe2R1)(NR2)] (1), according to mass balance analysis, IR, and NMR spectroscopies. The replacement of one amido group by a siloxy group from the surface... F Blanc,J Thivolle-Cazat,JM Bas...
liver flukes are digenean trematode parasites with a broad range of mammalian definitive hosts. The Fasciola genus defines two species with distinct but overlapping geographical ranges, where F. hepatica and F. gigantica, respectively, predominate in temperate and tropical locales. Their primary impact...
Values of the second-order rate constant for the formation of the Nb(III)-N(O)O2 species range between (1.4 ± 0.2) × 103 M−1 s−1 and (6.3 ± 0.8) × 103 M−1 s−1 and values for the conversion of Nb(III)-N(O)O2 to Nb(III) and NO3...