Nonglycoside analogs of the nucleotides 12. Photoionization mass spectra of the hydroxy-alkyl derivatives of pyrimidine bases of nucleic acids

1977 ◽  
Vol 26 (8) ◽  
pp. 1667-1671
Author(s):  
A. K. Smirnov ◽  
V. M. Orlov ◽  
S. N. Mikhailov ◽  
Ya. M. Varshavskii ◽  
V. L. Florent'ev
Keyword(s):  
Nucleic Acids ◽  
Mass Spectra ◽  
Alkyl Derivatives ◽  
Pyrimidine Bases ◽  
Derivatives Of

Bis[(η3-allyl)nickel(μ,η5-2,3-dihydro-1,3-diborolyl)]nickeI-Tetradecker- Komplexe mit terminalen Allylliganden/ Bis[(η3-allyl)nickel(μ,η5-2,3-dihydro-1,3-diborolyl)]nickel Tetradecker Complexes with Terminal Allyl Ligands

1984 ◽  
Vol 39 (8) ◽  
pp. 1046-1049 ◽  
Author(s):  
Thomas Kuhlmann ◽  
Walter Siebert
Keyword(s):  
Molecular Species ◽  
Mass Spectra ◽  
Nickel Complexes ◽  
Alkyl Derivatives ◽  
Derivatives Of ◽  
Allyl Ligands

AbstractReactions between bis(allyl)nickel complexes and alkyl derivatives of 2,3-dihydro-1,3-diborole (1a, b) in refluxing toluene or mesitylene yield deeply colored solutions. By distillation and chromatography the first η3-allyl tetradecker complexes 8 were obtained in 4 -15% yield. In the violet residues higher molecular species are present, which could not be identified. The red, oily tetradeckers are characterized by NMR and mass spectra; their formation is discussed.

EFFECTS OF DIETETIC NUCLEIC ACIDS AND COMPONENTS ON GROWTH OF AGRIA AFFINIS (FALLÉN) (DIPTERA: SARCOPHAGIDAE)

1964 ◽  
Vol 42 (5) ◽  
pp. 801-806 ◽  
Author(s):  
H. L. House
Keyword(s):  
Nucleic Acids ◽  
Growth Rates ◽  
Deoxyribonucleic Acid ◽  
Optimal Growth ◽  
Insect Larvae ◽  
Ecological Adaptations ◽  
Adenylic Acid ◽  
Pyrimidine Bases ◽  
Derivatives Of ◽  
Respective Species

Feeding tests on chemically defined diets; showed that dietary nucleic acids are needed for optimal growth rates of the parasitoid Agria affinis (Fallén) reared axenically. Both ribonucleic acid (RNA) and deoxyribonucleic acid (DNA) met this requirement qualitatively and were almost equal quantitatively. The nucleotides adenylic acid, guanylic acid, cytidylic acid, and uridylic acid were the only derivatives of RNA used by the insect larvae to promote growth rates. These nucleotides were equally well utilized regardless of whether their base was purine or pyrimidine. No evidence was found for the utilization of single nucleosides or purine and pyrimidine bases. Phosphorylation of the molecule seemed to be the primary need that decided the utilization of dietary nucleic acid components in this species of Diptera. This augments evidence that various species of Diptera utilize nucleic acids and their derivatives differently. Moreover, it supports an attractive hypothesis of other workers that differences in utilization derive from ecological adaptations of the respective species and more greatly concern the needs for non-essential nutrients than for the essential ones.

Inductive effect in EI-mass spectra of some 5,6-dihalogenides and 5,6-halohydrins of 5α-cholestan-3β-ol and 3β-acetoxy-5α-cholestane

1982 ◽  
Vol 47 (11) ◽  
pp. 2946-2960 ◽  
Author(s):  
Antonín Trka ◽  
Alexander Kasal
Keyword(s):  
Mass Spectra ◽  
Inductive Effect ◽  
Molecular Ions ◽  
Hydroxyl Group ◽  
Halogen Atoms ◽  
Derivatives Of

Partial EI-mass spectra of 3β-hydroxy- and 3β-acetoxy-5α-cholestanes substituted in positions 5α-, 6β- or 5α,6β- with a hydroxyl group or halogen atoms (fluorine, chlorine, bromine) are presented. The molecular ions of 5α,6β-disubstituted derivatives of 3β-hydroxy-5α-cholestane (or of its 3-acetate) are considerably more stable than the corresponding monosubstituted derivatives if at least one of the pair of the vicinal substituents is chlorine or fluorine. This increase in stability, most striking in 5α- and 6β-fluoro compounds, is explained by the inductive effect.

7-O-Alkyl derivatives of daunomycinone

1984 ◽  
Vol 49 (1) ◽  
pp. 313-319 ◽  
Author(s):  
Věra Přikrylová ◽  
Petr Sedmera ◽  
Josef V. Jizba ◽  
Jindřich Vokoun ◽  
Helena Lipavská ◽  
...  
Keyword(s):  
H Nmr ◽  
Toluenesulfonic Acid ◽  
Alkyl Derivatives ◽  
Derivatives Of

Reaction of daunomycinone (I) with alcohols and p-toluenesulfonic acid produces a mixture (~3 : 1) of its (7S)- and (7R)-O-alkyl derivatives II-IX. According to the 1H NMR evidence, the alicyclic ring exists in the 9H8 conformation in (7R)-O-alkyl derivatives, on the contrary to (7S)-epimers and 7-epi-daunomycinone that adopt the 8H9 conformation.

Polarized fluorescense of alkyl derivatives of fluorescein, MitoFluo and C8-Fl, in solutions with liposomes

2020 ◽  
Author(s):  
D.M. Beltukova ◽  
V.P. Belik ◽  
Y.N. Antonenko ◽  
A.A. Bogdanov ◽  
G.A. Korshunova ◽  
...  
Keyword(s):  
Alkyl Derivatives ◽  
Derivatives Of

Synthesis and reactivity of halide, hydride, and alkyl derivatives of (pentamethylcyclopentadienyl)(bisphosphine)iron(II)

1990 ◽  
Vol 9 (1) ◽  
pp. 260-265 ◽  
Author(s):  
Rocco A. Paciello ◽  
Juan M. Manriquez ◽  
John E. Bercaw
Keyword(s):  
Alkyl Derivatives ◽  
Derivatives Of
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