Synthesis and Stereochemistry of Some New 1,3-Oxathiane Derivatives

Summary. The synthesis and stereochemistry of some new 2,5-substituted 1,3-oxathiane derivatives are reported. The anancomeric or flexible structure of the derivatives and some peculiar cases of prochirality are revealed by NMR investigations.     

环糊精衍生物在荧光分析中的应用进展（下）

本文介绍了环糊精衍生物开发概况及目前已或将商品化的环糊精衍生物的合成思路与方法．重点阐述环糊精在荧光分析中的增效作用机理和应用，及环糊精母体和衍生物分析特性的不同．较详细地详述了光活性基团修饰的衍生物的开发和发展远景     

环糊精衍生物在荧光分析中的应用进展（上）

本文介绍环糊精衍生物开发概况及目前已或将商品化的环糊精衍生物的合成思路与方法，重点阐述环糊业在荧光分析中增效作用机理和应用，及环糊精母体和衍生物分析特性的不同，较详细地详述了光活性基团修饰性生物对开发和发展远景。     

Amino-acid sequence study in peptides by mass spectometry-II. Investigation of pentadeuterobenzoyl-peptide methyl esters

The utility of benzoyl and pentadeuterobenzoyl derivatives of peptide methyl esters for mass spectrometric analysis was investigated. The mass spectra of the glu-his and the val-tyr-pro derivatives are discussed. Treatment of the peptide methyl esters with the mixed benzoic-ethyl-carbonic anhydride did in some cases lead to benzoyl derivatives as well as to ethoxycarbonyl derivatives.     

Mass spectrometry of pyrrolo [2, 3- b] pyrazines and pyrazino [2, 3- b]indole

The first mass spectra of pyrrolo [2, 3-b] pyrazine and some of its derivatives and of pyrazino [2, 3-b] indole are reported and compared with those of related compounds. Differences between the spectra of some aryl substituted derivatives are described and discussed.     

Acylation of some substituted 1,2,4-triazole-3-thiones

Acylation of some substituted 1,2,4-triazole-3-thiones in the presence of triethylamine gives N-substituted derivatives. S-Substituted derivatives, which are readily transacylated to the N-substituted derivatives on heating, are formed in the case of 4-phenyltriazolethiones in alkaline media. In the case of 4-allyltriazolethiones acylation in alkaline media gives only the N-substituted derivatives. Bromination of the acyl derivatives gives the disulfides.     

In Process Citation

The electrochemical behaviour of some pyrazolone derivatives has been studied in aqueous and ethanolic media. beta-Diketone compounds with a labile hydrogen atom on carbon atom 4 are directly reducible in neutral ethanol; phenazone derivatives have to be diazotized. Pulse polarography is suggested for determination of these derivatives in pharmaceutical preparations.     

香豆素衍生物在数种薄层基质上的室温磷光发射特性

考查了二十多种香豆素衍生物在国产ＭＮ－Ｐ型和ＭＮ－Ｃ型微晶纤维素膜，ＤＥＡＥ离子交换膜上的室温磷光发射特性，并与用滤纸作基质时的结果作了比较。在这些基质上，多数衍生物都能发射不同强度的ＲＴＰ信号，且在其ＲＴＰ特性间呈现，某些取代基效应。从发光稳定性和信背比考虑，ＭＮ－Ｃ型比ＭＮ－Ｐ型膜更适合于这些衍生物的ＲＴＰ发射。     

Mass spectrometry of insect moulting hormones: Trimethylsilyl-methoxime derivatives of ecdysone and 20-hydroxyecdysone

The mass spectra of trimethylsilyl-methoxime derivatives of the two insect moulting hormones, ecdysone and 20-hydroxyecdysone are described together with some model compounds. These steroid derivatives are volatile in the gas chromatograph and their mass spectra provide a sensitive means of detection and structure recognition.     

The reactions of evonine and neoevonine alkaloids obtained from Euonymus Sieboldiana blume

The reactions of evonine (1), neoevonine (2), alkaloids of Euonymus Sieboldiana Blume, and their derivatives are described. The structural proofs of some derivatives are included.     

Synthesis of coumarin-3-O-acylisoureas by dicyclohexylcarbodiimide

The synthesis and isolation of some O-acylisoureas are described. The reaction between dicyclohexyl-carbodiimide and coumarin-3-carboxylic acids leads to coumarin-dicyclohexylisourea derivatives, isolated as the main products, and to coumarin-dicyclohexylurea derivatives as byproducts.     

Synthesis of some polyureas based on diamino derivatives of bis-1, 3, 4-oxadiazole

Ortho-, meta, and para-nitrobenzoyl derivatives of the dihydrazides of succinic, glutaric, adipic, and azelaic acids are prepared, from which are obtained nitro and amlno derivatives of bis-1,3,4- diazole. Various conditions for synthesizing these compounds are investigated. A series of polyureas is obtained by reacting diamino derivatives of bis-1,3,4-oxadiaole with diisocyanates, and some of their properties are investigated.     

Synthesis and Spectroscopic Studies of Some Novel Quinoline Derivatives

An intramolecular Wittig reaction of some substituted aminoacetophenones was used for the synthesis of novel quinoline derivatives. In addition, the base induced cyclization of the aminoacetophenones was investigated. The IR and NMR spectra of the quinoline derivatives are reported.     

Calculations of the second derivatives of the thermodynamic functions of pure substances in the vicinity of the critical point according to the van der waals equation

The second derivatives inverse to derivatives in the known sets of critical conditions were studied analytically at the critical point. All of them were shown to take on infinite values at the critical point. The special features of discontinuities of some of these derivatives in the critical state were revealed by numerical methods. The conclusions obtained are valid for any model of the unified equation of state of pure substances.     

几种电致发光聚合物材料的研究进展

介绍了几种典型的电致发光聚合物材料,包括聚(对苯乙烯撑)及其衍生物、聚噻吩及其衍生物、聚芴及其衍生物,对它们的结构、制备方法、特点进行了归纳和讨论。其中最重要的是聚(对苯乙烯撑)(PPV)及其衍生物,目前采用较多的制备方法是前聚物法和强碱诱导的去卤缩合法以及电化学聚合法。在苯环上引入长链烷烃、烷氧基或芳基后的取代PPV,即PPV的衍生物,可溶于很多有机溶剂。可溶性PPV衍生物为制备多层电致发光聚合物器件提供了有效途径。文章还对电致发光聚合物材料存在的问题和发展前景进行了探讨和展望。     

Heterocyclisch anellierte Derivate des Strychnins: Imidazo-, Oxazolo- und (1,3-Dioxolo)strychnine

Heterocyclic anellated derivatives of strychnine: Imidazo-, oxazolo- and (1,3-dioxolo)strychnine The synthesis of imidazo-, oxazolo- and dioxolo-strychnine derivatives, anellated at the 2,3-position of the aromatic nucleus is described. The spectroscopic properties of these compounds and of some intermediates are given.     

On Certain Organic Compounds with One Mono-Substitution and at Least Three Di-Substitution Homogeneous Derivatives

In this paper parent substances with molecules which can be divided into a skeleton and six univalent substituents, and that have the properties mentioned in the title, are considered. Two instances are the molecules of benzene and cyclopropane. The Lunn–Senior's groups of substitution isomerism of these compounds are described and upper bounds of the numbers of their di-substitution and tri-substitution homogeneous derivatives are found. Lists of the possible simple substitution reactions among di-substitution homogeneous derivatives, on one hand, and di-substitution heterogeneous, and tri-substitution homogeneous derivatives, on the other, are given. These substitution reactions allow for some derivatives to be identified with their structural formulae.     

Mass spectrometric studies of alkyl-, phenyl- and chloropyrimidines

The mass spectra of alkyl- and chloropyrimidines are recorded. A generalised fragmentation mechanism for the derivatives of pyrimidine is proposed. The principle of α-cleavage for heterocyclic compounds as proposed in the previous paper is shown to be valid for pyrimidine derivatives. Electronic structures of some molecular and intermediate ions are calculated by the openshell CNDO/2 and INDO methods.     

Thermal behaviour of some derivatives of malic acid with calcium and strontium

Results are presented on the thermal behaviour of two derivatives of malic acid. The decomposition intermediates obtained at about 400?C were identified as derivatives of malonic acid. For some individual thermal decomposition steps, the values of the non-isothermal kinetic parameters were determined.     

Photoinduced activation of molecular oxygen by various porphyrins,bis-porphyrins,phthalocyanines, pyridinoporphyrazins,and their metal derivatives

Aerobic irradiation of tetraphenylporphyrins, phthalocyanines, tetra-t-butylphthalocyanines, tetracarboxylphthalocyanines, tetrapyridinoporphyrazins and some of their metal derivatives with visible light (λ > 420 nm) give singlet oxygen by energy transfer and oxygen superoxide by electron transfer, but some of their Cu, Zn of Pt derivatives are efficient quenchers for superoxide formation.