Über die Acetylierung des Naphthalins

Zusammenfassung Bei der Acetylierung des Naphthalins mit Acetylchlorid und Aluminiumchlorid bei Gegenwart von Schwefelkohlenstoff wird immer ein Gemisch, von 1- und 2-Acetyl-naphthalin in einer Ausbeute von höchstens 75 % d. Th. erhalten. Der Gehalt des Ketongemisches an 1-Acetyl-naphthalin beträgt etwa 50–60%. Käufliche als '-Naphthyl-methyl-keton bezeichnete Produkte enthielten ebenfalls nur 56 bzw. 62% 1-Acetyl-naphthalin. Der Einfluß der Reaktionstemperatur und der angewendeten Aluminiumchlorid-Menge auf das Mengenverhältnis der gebildeten isomeren Ketone ist unwesentlich. Der Schmelzpunkt von 1-Acetyl-naphthalin liegt bei 10.5°.     

On the possible temperatures of a dynamical system

A simpleC*-algebra and a continuous one-parameter automorphism group are constructed such that the set of inverse temperatures at which there exist equilibrium states (i.e., KMS states, or, for =±, ground or ceiling states) is an arbitrary closed subset of IR{±}.With partial support of the National Science Foundation     

The use of naphthalene derivatives in inorganic analysis : The nitronaphthylamines as new reagents for mercuric mercury and ceric cerium

The use of 4-nitro-1-naphthylamme as a spot test for mercuric mercury and 1-nitro-2-naph-thylamine as a specific spot test for ceric cerium have been observed In each case, the reactions appear to be suitable for general qualitative inorganic analysis The ceric cerium test was specific whereas in the case of mercuric mercury. Ce⁺⁴ was the only on of 51 tested which interfered.     

Vibrational analysis of chlorinated methylphosphonic acids: Part 2. Vibrational analysis of CHCl2PO3H2 and its anions

The vibrational spectra (IR and Raman) of CHCl₂PO₃H₂ and its anions in H₂O and D₂O solutions are reported. The IR spectra of the solid dibasic sodium and potassium salts, the solid normal and O-deuterated monobasic sodium and potassium salt and the solid normal and O-deuterated acid are discussed. The principal results of the normal coordinate analysis of the compounds are tabulated.     

A method of investigation of heterostructure for junction lasers based on photoluminescence measurements

A four layer GaAs–Al_xGa_1–xAs heterostructure photoluminescence spectrum measured at 77K has been compared with the results of investigations concerning the composition of this heterostructure, performed by using the electron microprobe JXA-50A. The application of photoluminescence investigations of such heterostructures as a simple and convenient control method that can be used during the performance of a heterostructure laser has been proposed.     

Curved traversable wormholes in (3+1)-dimensional spacetime

We present the general method of constructing curved traversable wormholes in (3+1)-d spacetime and proceed to thoroughly discuss the physics of a zero tidal force metric without cross-terms. The (3+1)-d solution is compared with the recently studied lower-dimensional counterpart, where we identify that the much richer physics—involving pressures and shear forces of the mass-energy fluid supporting the former—is attributed to the mixing of all three spatial coordinates. Our (3+1)-d universe is the lowest dimension where such nontrivial terms appear. An explicit example, the static zero tidal force (3+1)-d catenary wormhole is analysed and we show the existence of a geodesic through it supported locally by non-exotic matter, similar to the (2+1)-d version. A key difference is that positive mass-energy is used to support the entire (3+1)-d catenary wormhole, though violation of the null energy condition in certain regions is inevitable. This general approach of first constructing the geometry of the spacetime and then using the field equations to determine the physics to support it has the potential to discover new solutions in general relativity or to generalise existing ones. For instance, the metric of a time-evolving inflationary wormhole with a conformal factor can actually be geometrically constructed using our method.