Big Chemical Encyclopedia

Chemical substances, components, reactions, process design ...

Articles Figures Tables About

Pyrimidine bases nomenclature

The names of these compounds as aza analogs were coined in the same way as those of the 6-aza analogs employing the frequently used numbering of uracil (1). This nomenclature is most often used for the principal aza analogs of pyrimidine bases (e.g., 5-azauracil) it is rarely used for further systematic derivatives. [Pg.192]

The nomenclature of nucleotides and their constituent units was presented earlier (Section 5.1.2). Recall that a nucleoside consists of a purine or pyrimidine base linked to a sugar and that a nucleotide is a phosphate ester of a nucleoside. The names of the major bases of RNA and DNA, and of their nucleoside and nucleotide derivatives, are... [Pg.1029]

The fusion name l//-triazolo[4,5-d]pyrimidine for (140) is preferred by practitioners in the field and appears in CA indexes. On the other hand, the nonspecialist, who may well be uncertain about his command of fusion nomenclature, might more easily grasp the replacement name l//-l,2,3,4,6-pentaazaindene. (This is an appropriate place to emphasize that, by lUPAC rules, replacement names are to be based only on a completely carbocyclic parent. Notwithstanding the attractive simplicity of 8-azapurine for the example at hand, it has no sanction see, however. Section 1.02.3.2. The purpose of this avoidance is to forestall a multiplicity of names for systems containing several hetero atoms.)... [Pg.36]

In all types of nomenclature based on triazine the numbering of the substituents is shifted by one as compared with the nomenclature of 6-aza analogs of pyrimidines. [Pg.204]

Nitrogenous base plus sugar moiety are called nucleosides. Ribonucleic acids (RNA) resemble DNA in that nucleoside monophosphates are joined through phosphodiester bonds. RNAs differ in that the sugars are p-D-ribose units and the pyrimidine uracil is found in place of thymine. Molecular structures and nomenclature for nitrogenous bases, nucleosides, and nucleotides are delineated in Table 2.2. [Pg.40]

Bases, Nucleosides, and Nucleotides. The relationship of these components of a nucleic acid or polynucleotide is shown in Chart 10. The numbering of the pyrimidine (uracil) and the purine (adenine) shown is the IUPAC nomenclature used by Chemical Abstracts, and... [Pg.287]

Both DNA and RNA contain two major purine bases, adenine (A) and guanine (G), and two major pyrimidines. In both DNA and RNA one of the pyrimidines is cytosine (C), but the second major pyrimidine is not the same in both it is thymine (T) in DNA and uracil (U) in RNA Only rarely does thymine occur in RNA or uracil in DNA The structures of the five major bases are shown in Figure 8-2, and the nomenclature of their corresponding nucleotides and nucleosides is summarized in Table 8-1. [Pg.274]

The nomenclature for the minor bases can be confusing. Like the major bases, many have common names— hypoxanthine, for example, shown as its nucleoside inosine in Figure 8-5. When an atom in the purine or pyrimidine ring is substituted, the usual convention (used... [Pg.276]

Table 27-1 gives the nomenclature of purine and pyrimidine nucleosides and nucleotides. Names of purine nucleosides end in -osine, whereas those of pyrimidine nucleosides end in -idine guanine nucleoside is guanosine and should not be confused with guanidine, which is not a nucleic acid base thymidine is a deoxyriboside. [Pg.615]

Nomenclature Base name + idine (pyrimidine) or + osine (purine)... [Pg.5]


See other pages where Pyrimidine bases nomenclature is mentioned: [Pg.203]    [Pg.266]    [Pg.238]    [Pg.233]    [Pg.462]    [Pg.410]    [Pg.350]    [Pg.78]    [Pg.47]    [Pg.247]    [Pg.567]    [Pg.272]    [Pg.1675]    [Pg.247]    [Pg.163]   
See also in sourсe #XX -- [ Pg.191 , Pg.192 , Pg.203 ]

See also in sourсe #XX -- [ Pg.191 , Pg.192 , Pg.203 ]




SEARCH



Nomenclature bases

Pyrimidine bases

© 2024 chempedia.info