Sorption of Industrial Oil by Expanded Graphite

Sorption of industrial oil by expanded graphite prepared from residual graphite hydrosylfate at 300-900°C was studied. The sorption isotherms of both neat oil and oil from its aqueous suspension were measured. The sorption capacity for oil was studied as influenced by the specific surface area and specific volume of expanded graphite sorbent.     

Mass spectrometric study of desoxyamino sugars

Conclusions The mass spectra of ten 3,4-didesoxy-3-amino sugars have been studied. A novel type of ring cleavage was detected in the molecular ions of these compounds, which had not been encountered in previously studied sugar derivatives.Translated from Izvestiya Akademii Nauk, SSSR Seriya Khimcheskaya, No. 2, pp.437–439, February, 1970.     

The effect of the relative location of the double bond and the alkoxy group on the mass-spectrometric behavior of alkoxydihydropyranes

Conclusions The mass spectra ofthree 6-alkoxy-³-dihydropyranes and of three 6-alkoxy-²-dihydropyranes have been studied. As distinct from the previously studied 2-alkoxy-³-dihydropyranes, the dominant fragmentation pattern for the compounds under investigation is by retrodiene degradation. Furthermore, in the case of the ²-isomers the charge is preferentially localized on the olefin fragment while for the ³-isomers, it is located on the diene fragment.Translated from Izvestiya Akademii Nauk SSSR, Seriya Khimicheskaya, No. 6, pp. 1442–1444, June, 1970.     

Reaction of alcohols and some nitrogen-containing compounds with 2-ethoxy-Δ3-dihydropyrans

The ethoxy group is replaced by the corresponding residue when 2-ethoxy-Δ³-dihydropyrans are heated with compounds having a labile hydrogen atom (alcohols, imidazoles, and urethanes). The stereochemical principles of the reaction of 6-substituted 2-ethoxy-Δ³-dihydropyrans with benzyl alcohol were studied.     

Control of sp2/sp3 carbon ratio and surface chemistry of nanodiamond powders by selective oxidation in air

The presence of large amounts of nondiamond carbon in detonation-synthesized nanodiamond (ND) severely limits applications of this exciting nanomaterial. We report on a simple and environmentally friendly route involving oxidation in air to selectively remove sp(2)-bonded carbon from ND. Thermogravimetric analysis and in situ Raman spectroscopy shows that sp(2) and sp(3) carbon species oxidize with different rates at 375-450 degrees C and reveals a narrow temperature range of 400-430 degrees C in which the oxidation of sp(2)-bonded carbon occurs with no or minimal loss of diamond. X-ray absorption near-edge structure spectroscopy detects an increase of up to 2 orders of magnitude in the sp(3)/sp(2) ratio after oxidation. The content of up to 96% of sp(3)-bonded carbon in the oxidized samples is comparable to that found in microcrystalline diamond and is unprecedented for ND powders. Transmission electron microscopy and Fourier transform infrared spectroscopy studies show high purity 5-nm ND particles covered by oxygen-containing surface functional groups. The surface functionalization can be controlled by subsequent treatments (e.g., hydrogenization). In contrast to current purification techniques, the air oxidation process does not require the use of toxic or aggressive chemicals, catalysts, or inhibitors and opens avenues for numerous new applications of nanodiamond.     

A new method for production of composites consisting of expanded graphite and amorphous carbon

A new method was developed for production of composites constituted by expanded graphite and amorphous carbon from residual graphite hydrosulfate and a precursor of amorphous carbon, sucrose.     

Reactions of 1-alkoxycarbonylaziridines with nucleophilic reagents

1-Methoxycarbonylaziridines react under mild conditions with a number of nucleophilic reagents such as water, acids, alcohols, and amines with opening of the aziridine ring. In the case of 7-methoxycarbonyl-7-azabicyclo[4.1.0]heptane it was shown by PMR spectroscopy that the ring-opening reaction is realized stereoselectively to give trans-1,2-disubstituted cyclohexanes.Translated from Khimiya Geterotsiklicheskikh Soedinenii, No. 8, pp. 1054–1057, August, 1981.     

Mass-spectrometric study of the cleavage products of 3,4-epoxytetrahydropyrans by amines

Conclusions Only 4-methyl-3-amino-4-hydroxytetrahydropyrans are formed when the oxide ring of 4-methyl-3,4-epoxytetrahydropyran is opened by ammonia and amines. The structural isomers of 4-amino-3-hydroxy-and 3-amino-4-hydroxytetrahydropyran are formed in the analogous reaction of the unsubstituted 3,4-epoxy-tetrahydropyran, the mutual arrangement of the substituents in which was determined on the basis of analyzing the mass spectra.Translated from Izvestiya Akademii Nauk SSSR, Seriya Khimicheskaya, No. 3, pp. 636–639, March, 1971.     

A mass-spectrometric investigation of derivatives of Δ3-dihydropyrane

Conclusions The mass spectra of eleven derivatives of ³-dihydropyrane have been recorded and their basic fragmentation paths have been studied.Translated from Izvestiya Akademii Nauk SSSR, Seriya Khimicheskaya, No. 5, pp. 1184–1187, May, 1970.     

Relationship between the structure and properties of amino alcohols and their derivatives

Methods have been developed for the alkylation of imidazole by unsaturated compounds and -bromoacetophenone in the presence of weakly alkaline agents. Several new alcohols and ketones containing N-imidazolyl groups were obtained.See [1] for communication VIII.Translated from Khimiya Geterotsiklicheskikh Soedinenii, No. 5, pp. 662–664, May, 1971.The authors thank M. A. Belousova and T. N. Dyumaeva for obtaining the IR spectra and A. I. Chernyshev for obtaining the PMR spectra.