Photochemical Reaction of Nalidixic Acid in Methanol
The photochemical reactions of methanolic nalidixic acid (NAL) solution in the absence and in the presence of air have been investigated using 300 nm UV light. From the reactions, 1-ethyl-7-methyl-4-oxo-4-hydro-1,8naphthyridine (EMDN), formic acid, and formaldehyde are produced. In the presence of air, hydrogen peroxide is also detected along with the products listed above. The presence of oxygen during the irradiation of methanolic NAL solution effects on the product yield. The initial quantum yields of the products and of the NAL decomposition are determined. Possible reaction pathways for the photochemical reaction are suggested on the basis of the products analysis.
Photochemie heterocyclischer enone—I : Photolyse und thermolyse von nalidixinsäure
Abstract The photolysis of nalidixic acid 1 in alkaline oxygen free solution was studied in the range up to 40000 cm−1. The decarboxylation product 2, carbondioxide 3, ethylamine 4, and a new diketone 5 were isolated and identified—Thermolysis of nalidixic acid 1 was studied in the melt and in paraffin oil solution in the absence of oxygen. Besides the decarboxylation product 2, a dimer was isolated from this reaction. A structure for the dimer is proposed on the basis of masspectral and 1H NMR-studies. A reaction scheme for the photolysis and thermolysis of 1 is proposed.
AN INTRODUCTION T O THE SOILS OF THE SOUTH-EASTERN PORTION OF THE AUSTRALIAN ARID ZONE
Summary 
 
Seven soil regions, each of which is dominated by soils belonging to one or two great soil groups, are defined and mapped. The outstanding feature is the presence of a variety of soils with widely differing characteristics. The soils are deeper, have more profile differentiation and are finer-extured than those in most-arid regions and are frequently overlain by currently-forming deposits of wind-transported materials. Because the vegetative cover is better developed and there are only small areas of rocky hills and bare rock pediments, water erosion and deposition are not as prominent as in other arid areas.