We report the synthesis by two routes, of hitherto unknown 3, 4‐epoxy‐2, 3, 4, 5‐tetrahydrobenz[f]azepine‐2, 5‐dione and hence a new route to 2, 3, 4, 5‐tetrahydrobenz[f]azepine‐2, 4, 5‐triones which are precursors of 2‐quin‐olonecarboxylic acids.
Uncompacted vadose zone sand aquifers, with their highly interconnected pores and tendency to contain iron‐rich cements and clay skins, are not necessarily susceptible to characterization by nuclear magnetic resonance (NMR) wireline logging. A necessary condition for valid application of this technology to such aquifers is that the NMR signal may be quantitatively related to pore size. To test the hypothesis that this is the case, pore image and NMR data were acquired from cores collected from three sand units beneath the Savannah River Site in South Carolina. Statistical unmixing of pore image and transverse relaxation time (T2) data allowed the pore space to be subdivided into image‐based pore types and NMR endmembers, respectively. The image‐based pore classification bears a systematic relationship to hydraulic conductivity, and is thus shown to be petrophysically relevant. However, the image‐based and NMR components cannot be correlated with one another in terms of either volumetric abundance or size characteristics. The hypothesis was therefore rejected. The lack of correlation is attributed to either, or both, of two effects: coupling of NMR response from spatially associated pores of different pore types, and variation in pore wall relaxivity resulting from the heterogeneous distribution of pore lining iron‐stained clay skins. These results do not condemn the use of NMR logging in consolidated aquifers in which neither of these effects occurs, but further research is needed to establish whether there are any conditions under which unconsolidated aquifers may be validly characterized using this technique.
ChemInform Abstract The hitherto unknown epoxy-tetrahydro benzazepinedione (Va) can be obtained from the epoxide (I) or the dione (III) as shown in the scheme. (Va) and its nitration product (Vb) are converted to the triones (VI) and the acids (VII) (most yields given in mg).
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