1. Heterocyclic compounds with oxygen heteroatom (s)only.

2. Heterocyclic compounds with nitrogen heteroatom(s)only.

3. Heterocyclic azo dyes are one group of the most important chromogenic reagents in spectrophotometric analysis.

4. Compounds having five-membered heterocyclic rings include chlorophyll, hemoglobin, indigo, tryptophan, and certain polymers.

5. Pyrazolopyridines are a kind of fused heterocyclic compounds received more and morethe recent years.

6. Biogenic amines are aliphatic, alicyclic or heterocyclic organic bases of low molecular mass, which arise as a consequence of metabolic processes in animal, plants and microorganisms.

7. Carbazole, a kind of nitro heterocyclic compound, was the main constituted part of the coal tar fraction. There was about 15% of the carbazoles contained in the high temperature coal tar.

8. A five-membered heterocyclic ring compound, C4H5N, having an odor similar to chloroform. It is the parent compound of hemoglobin, chlorophyll, and many other complex, biologically active substances.

9. Heterocyclic ring care compounds of carbon chain that contains one or more non-carbon atoms in organic form.

10. An aryl-replaced nitrogen heterocyclic compound preparation method belongs to the technical field of organic compound catalytic chemistry.

11. This paper describes heterocyclic triazene group reagents having been reported in the past few years.

12. Morphine: Heterocyclic compound, narcotic analgesic alkaloid originally isolated from opium.

13. Triazine is a type of heterocyclic organic compounds, it is important to ring nitrogen organic chemical raw materials.

14. Barbiturate: Any of a class of heterocyclic compounds Based on the parent structure, uric acid, and used in medicine.

15. The structure of heterocyclic ketene aminals is peculiar and notable which possesses a large conjugation system in its molecule.

16. HMO characteristic polynomial and select eigenvalues for many heterocyclic benzenoids are calculated by using chemical graph theory methods.

17. We have, therefore , in both of the examples above, heterocyclic compounds with " built - in " or latent functionality.

18. The development of the benzimidazole and it's derivatives, especially two replacements of benzimidazole, is regarded as a category with a variety bioactivities of heterocyclic.

19. Heterocyclic chemistry is an important component of organic chemistry, the pyrrole, indole derivatives is one of the areas most active in heterocyclic chemistry and occupies an important position.

20. Azole: a class of organic compounds having a five - membered heterocyclic ring with two double bonds.

21. This article reviews the ring opening reaction of five membered nitrogen containing heterocyclic compounds.

22. Some important insecticides developed in recent years were briefly presented according to the mode of action. The new focus of insecticides developed is on the nitrogen-bearing heterocyclic compounds.

23. Many constituents are mutagens and carcinogenic such as alkenes, nitrosamines, polynuclear aromatic and heterocyclic hydrocarbons, amines.

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24. The new focus of insecticides developed is on the nitrogen-bearing heterocyclic compounds.

25. Five analogs of imidacloprid, 1 (2 chloro 5 pyridyl) methyl 2 nitroiminoimidazolidine, were synthesized by replacing the pyridyl group of imidacloprid with other heterocyclic groups.

26. And the other in Linhai, Zhejiang will mainly develop heterocyclic chemicals.

27. The research direction and main operation includes four parts: Medicine material and chiral compound, organic acid and its ramification, heterocyclic compound and customizes products.

28. New , sterically demanding 1, 3 - dialkylimidazolinium salts used as N - heterocyclic carbene precursors were synthesized and characterized.

29. The attachment of a group to a central metallic agent such as iron with two valences to form a heterocyclic ring.

30. An organic coordination (complexing ) compound in which the metal ion is bound to atoms of nonmetals, e. g. nitrogen, carbon, or oxygen, to form a heterocyclic ring having coordinate covalent bonds.

31. A series of researches indicated: direct linkage of heterocyclic to thio-acetic acid is a feasible method for constructing a new material.

32. Four novel difused heterocyclic thioether derivatives were designed and synthesized from 3-hydrosulfo-5-amidogen-1,2,4-triazolo.

33. Structute of nitrogen heterocyclic ring quaternary ammonium salt cationic surfactants was identi fied by mass spectrography, nuclear magnetic resonance spectra, infrared spectra and etc.

34. Hexahydroxy N - containing heterocyclic compound without sulfur and phosphorus was synthesized and its structure was characterized.

35. Specific strains of lactic acid bacteria possessing antimutagenic properties are suggested to remove mutagenic contaminants of foods such as mycotoxin and heterocyclic amine.

36. Certain substituted benzylamino heterocyclic and heteroaryl derivatives have provided unexpected insecticidal and acaricidal activity.

37. The progresses in five - membered heterocyclic metallocene analogic complexes and their application in olefin polymerization are reviewed.

38. And there are 8 kinds of main components in liquid fuel, which belong to higher olefine hydrocarbon, acetylene series,() heterocyclic compound and polycyclic organic matter.

39. Expounded in this article is divided into three chapters, which are summarized as follows:1. Epoxide and its derivatives are important triatomic heterocyclic compounds.

40. It is a heterocyclic compound that is found in small amounts in most proteins .

41. The invention discloses a plant of pseudomonad and the application thereof in the biological removal of nitrogen heterocyclic compound.

42. Due to long term application of organic manure and inorganic fertilizers, the portion of N in heterocyclic compound was reduced, while benzene and non-benzene compound was increased.

43. Heroin: Heterocyclic compound, a highly addictive alkaloid derivative of morphine (chemically, it is diacetylmorphine) that makes up a large portion of illicit narcotics traffic.

44. In this paper , two unsaturated alicyclic nitrogen heterocyclic crownethers were synthesized by phase transfer reaction.

45. Association between a heterocyclic compound stimulating lipid and carbohydrate metabolisms and an antioxidant agent for treating obesity.

46. It is a heterocyclic compound, containing a pyridine ring; its chemical formula is C10H14N. Nicotine is the chief addictive ingredient (see drug addiction) in cigarettes and cigars and in snuff.

47. Tetronic acid, tetronic amine and their derivatives are five-membered heterocyclic compounds along with bio- and pharmacological activities.

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48. Heme, a complex heterocyclic compound, is an organic molecule derived from porphyrin with an iron atom at the centre.

49. Tetrazole is the unsaturated energetic heterocyclic compound with high nitrogen content and good stability leading to the high energy yet low sensitivity materials.

50. They are generally part of the nitrogen-containing heterocyclic ring and the biphenyl components, the former is much more varied, while the latter is relatively stable.

51. HH - 3 S is a heterocyclic compound, transparent acidic fluid.

52. By Hull cell test, a kind of anion surfactant and nitrogen heterocyclic compound was chosen as a additive for pulse non-cyanide silver electroplating.

53. This paper describes the applications and the synthetic method of heterocyclic compounds Imidazolidone and Imidazolethione.

54. The heterocyclic compound can be applied in the field of pesticide.