The polymorphic transformations of cobalt molybdate

Polymorphic transformations of CoMoO₄ were studied by means of high temperature X-ray measurements within the temperature range 25–1200°C. On heating phase a obtained from low temperature modification b a new modification a′ was discovered. Phase a obtained by thermal decomposition of solvated α-CoMoO₄ shows different behaviour. At 700–930°C depending on the conditions of preparation it transforms irreversibly into still another modification a″. On cooling, a mixture of phases a + a″ is obtained, the presence of a″ being responsible for the explosionwise transition into b, observed around the room temperature.     

Nitro compounds as alkylating reagents in friedel-crafts conditions : Reaction of 2-nitropropane with benzene

Friedel-Crafts reaction of benzylic or tertiary nitro compounds with benzene gave normal alkylation products. Similarly, 2-nitropropane (2-NP) gave cumene (1) which underwent further transformation affording a mixture whose behaviour with time was investigated : results were consistent with oxidative formation of the cumyl carbonium ion (7').     

Benzo[b] thiophene derivatives. XVIII. The sulfur isosteres of harmaline,harmine and related isomers

The sulfur analogs of harmaline, 7-methoxy-3,4-dihydro-1-methyl[1]benzothieno[2,3-c]-pyridine (Ib), harmine, 7-methoxy-1-methyl[1]benzothieno[2,3- c ]pyridine (IIb), and corresponding 6-methoxy isomers (Ic and IIc) have been synthesized for pharmacological evaluation as monoamine oxidase inhibitors.     

Bulk and localized oxygen concentration measurements of steam-oxidized zircaloy-4 using nuclear analysis techniques

Quantitative measurement of both bulk and localized oxygen concentrations is of importance in the study of oxidation kinetics. We describe the combined application of two nuclear techniques, fast neutron activation analysis and (d, p) nuclear microprobe, to the determination of oxygen concentrations and surface profiles for steam-oxidized Zircaloy-4 cladding specimens. Results of measurements using these techniques are presented. Work partially supported by Electric Power Research Institute Contract T.S.A. No. 20.     

Hydroboration and diimide reduction of caryophyllene and isocaryophyllene

The monohydroboration of caryophyllene with dicyclohexylborane followed by oxidation brought about the participation of the (E)-trisubstituted double bond in preference to the exocyclic double bond during hydroboration to the corresponding unsaturated alcohol. This alcohol gave the corresponding ketone by oxidation. Isocaryophyllene under similar conditions provided the unsaturated alcohol as the major product, wherein the participation of the exocyclic double bond took place during hydroboration. Our attempts to achieve cyclic hydroboration with caryophyllene or isocaryophyllene using thexylborane resulted in the formation of the corresponding unsaturated alcohol. We achieved partial regioselective reduction of caryophyllene and isocaryphyllene with diimide to produce the corresponding dihydroderivative.     

Regiospecific α-dialkoxymethylation of preformed enolates

Reaction of a preformed lithium enolate and trimethyl orthoformate with added boron trifluoride leads to the corresponding α-dimethoxymethyl ketone.     

Local doses associated with119mSn isomeric transition

The energy absorbed by immediate surrounding of disintegrating^119mSn nuclei have been estimated by comparing the Mössbauer emission spectra of¹¹⁹Sn in some tin compounds with the absorption spectra of the same substances after -irradiation and by simple calculations of Auger electrons energy losses. The results obtained indicate that the observed post-effects of the^119mSn decay are due to self-radiolysis and other processes, whose contributions depend on the individual properties of the matrices.     

Fast formation of aromatic cations in cyclohexane observed by pulse radiolysis

The fast formation of cations of benzophenone, biphenyl, naphthalene, anthracene and phenanthrene in liquid cyclohexane was studied by nanosecond pulse radiolysis. Rate constants between 2.3 × 10¹⁰ M^?1 s^?1 (for naphthalene) and not below 2.5 × 10¹² M^?1 s^?1 (for benzophenone) were derived and compared with the corresponding rate constants for anion formation.     

Untersuchungen an Alkylmetallalkoxiden der Elemente Aluminium,Gallium und Indium. III. Eigenschaften und Schwingungsspektren von Dialkylgallium- und Indiumalkoxiden

Studies on Alkyl Metal Alkoxides of Aluminium, Gallium, and Indium. III. Properties and Vibrational Spectra of Dialkylgallium- and Indium Alkoxides The preparation and the properties of dialkyl metal alkoxides R₂MOR′ (with R = CH₃, CD₃, C₂H₅; R′ = CH₃, CD₃ and M = Ga, In) are described. The vibrational data (IR and Raman) of the trimeric methyl derivatives point to puckered six-membered M₃O₃-ring systems.     

New Complexes of the Tetrachloro and Tetrabromo Acids of Indium (III) with organic LEWIS Bases

The preparation of the salts of the tetrachloro and tetrabromo acids of indium with the organic LEWIS bases (aniline, pyridine and quinoline) is reported. The physical and chemical properties, as well asI.R. spectra and theX-ray analysis are discussed.