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Anisic acid or methoxybenzoic acid is an organic compound which is a carboxylic acid. It exists in three forms, depending on arene substitution patterns: p-Anisic acid (4-methoxybenzoic acid) m-Anisic acid (3-methoxybenzoic acid) o-Anisic acid (2-methoxybenzoic acid)
o-Anisic acid is an organic compound with the formula CH 3 OC 6 H 4 CO 2 H. A colorless solid, it is one of the isomers of anisic acid. The compound has been well studied with respect to intramolecular hydrogen bonding [2] and as a substrate for various catalystic reactions. [3]
p-Anisic acid, also known as 4-methoxybenzoic acid or draconic acid, is one of the isomers of anisic acid. The term "anisic acid" often refers to this form specifically. [ 1 ] It is a white crystalline solid which is insoluble in water, highly soluble in alcohols, and soluble in ether and ethyl acetate .
Nucleic acid NMR is the use of NMR spectroscopy to obtain information about the structure and dynamics of polynucleic acids, such as DNA or RNA. As of 2003, nearly half of all known RNA structures had been determined by NMR spectroscopy. [31] Nucleic acid and protein NMR spectroscopy are similar but differences exist.
Triple resonance experiments are a set of multi-dimensional nuclear magnetic resonance spectroscopy (NMR) experiments that link three types of atomic nuclei, most typically consisting of 1 H, 15 N and 13 C. These experiments are often used to assign specific resonance signals to specific atoms in an isotopically-enriched protein.
However, HOESY can offer information about other NMR active nuclei in a spatially relevant manner. Examples include any nuclei X{Y} or X→Y such as 1 H→ 13 C, 19 F→ 13 C, 31 P→ 13 C, or 77 Se→ 13 C. The experiments typically observe NOEs from protons on X, X{1 H}, but do not have to include protons. [21]
Upon first approach, Republic Airways Flight 4514 diverts from course, circles around, and lands during a second attempt at Reagan National Airport.
1 H– 15 N HSQC polarization scheme for a protein/amino acid. 1 H– 15 N HSQC spectrum of a fragment of an isotopically labeled protein NleG3-2. Each peak in the spectrum represents a bonded N-H pair, with its two coordinates corresponding to the chemical shifts of each of the H and N atoms. [2]