Dehalogenation of α -haloketones and vic-dibromides with nickel boride

α-Haloketones and $\text{vic}$-dibromides are converted to the corresponding ketones and alkenes respectively with nickel boride generated $\text{in situ}$ from sodium borohydride and nickel chloride.     

Estimation of two normal means which may be common

Consider the problem of estimating the mean of a normal population when independent samples from this as well as a second normal population are available. Pre-test estimators which combine the two sample means if a test of the hypothesis of equal population means accepts but otherwise use only the first sample mean, are compared to limited translation estimators which are derived in the spirit of Bickel (1984, Ann. Statist., 12, 864–879) (we also cover the cases of unknown variances). Our conclusion is that if the accuracy with which the second population mean can be estimated is of the same or better order of magnitude as teh accuracy with which the first can be estimated, then the limited translation estimators largely dominate the pre-test estimators in terms of mean square error loss.This research was supported by grants from the FRD of the CSIR of South Africa.     

Die Reaktion7Li (d, α)5He im Energiegebiet von 0,6 bis 2,0 MeV

The excitation function of the reaction⁷Li(d, α)⁵He has been measured between 0.6 and 2.0 MeV in steps of 50 keV. The two resonances at 0.75 and 1.00 MeV corresponding to the levels at 17.28 and 17.48 of the compound nucleus⁹Be were resolved. Angular distribution measurements were performed at 14 different energies mainly near the 1.00 MeV resonance. From the analysis of the data the 17.28 MeV level seems to be a positive parity state (3/2⁺ → 7/2⁺) whilst a negative parity (7/2^? or 9/2^?) is indicated for the 17.48 MeV level. This is contrary to the order of parities as given in the literature.     

Infrared absorption spectra of functional derivatives of 5-nitrofurfuryl-2-polyalkenes and intramolecular interaction

The frequency characteristics of the vibration spectra of a number of polyalkene derivatives of 5-nitrofuran are examined. In particular, the IR spectra vibrations frequencies of the furan ring, nitro group, double bonds, and carbonyl group are examined with respect to the near and more remote intramolecular environment. The effects of intramolecular interaction, transmitted both through a chain of a 2-substituted system of the polyene type, and through a system of furan ring double bonds, are determined. The problem of the aromaticity of the furan ring is considered.     

Synthesis of some substituted 2- and 4-[2′-(5″-nitro-2″-furyl)vinyl]-quinolines

A series of 2- and 4-[2-(5-nitro-2-furyl)vinyl]quinolines were synthesized by catalytic condensation of 5-nitrofurfural with 2- and 4-methylquinolines. 2-Methylquinoline (quinaldine) and its substituted derivatives also react when the starting reagents are fused directly.Deceased.Translated from Khimiya Geterotsiklicheskikh Soedinenii, No. 2, pp. 253–255, February, 1976.     

Methanolysis and hydrolysis of derivatives of methyl 2,5- and 4,5-dihydrofuran-2-carboxylates

Methyl 2,5-dimethoxy-2,5-dihydrofuran-2-carboxylate is formed in the reaction of HCl-CH₃OH with methyl 5-nitro-2-acetoxy-2,5-, 5-nitro-4-acetoxy-4,5-, and 2,5-diacetoxy-2,5-dihydrofuran-2-carboxylates, whereas methyl 2,5-dioxo-3-pentenoate bis(2,4-dinitrophenylhydrazone) and 4-oxo-2-penten-1,5-dioic acid 2,4-dinitrophenylhydrazone are isolated in the presence of 2,4-dinitrophenylhydrazine. Methyl 5-nitrofuran-2-carboxylate is formed by treatment of methyl 5-nitro-2-acetoxy-2,5-dihydrofuran-2-carboxylate with aqueous solutions of acetic or phosphoric acid.Translated from Khimiya Geterotsiklicheskikh Soedinenii, No. 12, pp. 1600–1603, December, 1977.     

1-methyl-(D3)-trishomocubane

The acid catalysed rearrangement of 8-methyl-pentacyclo(5.4.0.0^2,6.0^3,10.0^5,9)undecan-8-endo-o1 ($\text{8}$) to 3-methyl-(D₃)-trishomocuban-4-o1 ($\text{9}$) provided the key step to the synthesis of the title compound ($\text{11}$).     

Structures of three isomeric ring-brominated PEA β-blockers: [C13H21BrNO3]+·Cl−, [C13H21BrNO3]+·[CH3SO3]−, and [C13H21BrNO3]+·[C2HO4]−

The X-ray crystal structures of three-blockers of the phenylethanolamine (PEA) class have been determined by single crystal techniques. They are (I): (±)-2-(2-bromo-3,4-dimethoxyphenyl)-2-hydroxy-N-isopropylethylamine hydrochloride; (II): (±)-2-(3-bromo-4,5-dimethoxyphenyl)-2-hydroxy-N-isopropylethylamine methylsulphonate; (III): (±)-2-(2-bromo-4,5-dimethoxyphenyl)-2-hydroxy-N-isopropylethylamine hydrogen oxalate. A conformational energy map of a partially hydrated model cation as a function of the principal torsion angles ₁ and ₂ shows the transperpendicular conformer (₁90°, ₂180°) to be the most stable. This conformation is adopted by cations of (II) and (III) in their crystals, but for (I), ₁=52.3(6)° is observed. Non-bonded pharmacophoric distances lie within the expected ranges.