Isomeric methoxypyridine-1-oxides and 1-methoxypyridones: Electronic spectra and structure

Cignitti, M.; Soccorsi, L.; Gatta, Franco; Cotta-Ramusino, Marina

doi:10.1016/0584-8539(85)80236-1

Cited by 6 publications

(2 citation statements)

References 22 publications

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“…There is little structural information on this type of ligand in the literature. Besides an ORTEP diagram of 5-methoxy-6-methyl-I-hydroxy-2(lH)-pyridinone without further structural data (7) and some calculated bond lengths for 1-hydroxy-2(lH)-pyridinone (8) raphic characterization of a 1-hydroxy-2-pyridinone derivative is that reported (9) dimers are present in the solid-state structure of free salicylohydroxamic acid (10). This is in contrast to the intramolecular hydrogen bond in 14, the "chelated proton" being located from a difference Fourier synthesis (9).…”

Section: Resultsmentioning

confidence: 99%

Structural studies of organoboron compounds. XLIV. 2,3-Dihydro-3-hydroxy-2,2-tetramethylene-4H-benzoxazin-4-one and its difluoroboron chelate, 2,2-difluoro-4,4-tetramethylene-1,3,5-trioxa-3a-azonia-2-borata-2,3,4,5-tetrahydro- 1H-cyclopenta[a]naphthalene

Kliegel¹,

Tajerbashi²,

Rettig³

et al. 1991

Can. J. Chem.

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. Can. J. Chem. 69,673 (1991).The reaction of 2,3-dihydro-3-hydroxy-2,2-tetramethylene-4H-benzoxazin-4-one, 2, and diethyl ether-boron trifluoride yields the difluoroboron chelate 2,2-difluoro-4,4-tetramethylene-1,3,5-trioxa-3a-azonia-2-borata-2,3,4,5-tetrahydr0-1H-cyc10-penta[a]naphthalene, 6, in high yield. There are two crystal forms of 2: 2a, triclinic, P i , a = 8.551(1), b = 9.331(3), c = 7.236(1) A, a = 103.38(2), P 104.68(1), y = 80.37 (2)

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Section: Resultsmentioning

confidence: 99%

Structural studies of organoboron compounds. XLIV. 2,3-Dihydro-3-hydroxy-2,2-tetramethylene-4H-benzoxazin-4-one and its difluoroboron chelate, 2,2-difluoro-4,4-tetramethylene-1,3,5-trioxa-3a-azonia-2-borata-2,3,4,5-tetrahydro- 1H-cyclopenta[a]naphthalene

Kliegel¹,

Tajerbashi²,

Rettig³

et al. 1991

Can. J. Chem.

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“…The spectroscopic properties of pyridine N-oxides are well documented in the literature [31][32][33][34].…”

Section: Spectroscopic Propertiesmentioning

confidence: 99%

Oxidation of N‐heterocyclics: A green approach

Sivasubramanian¹,

Parameswaran²

2007

Journal of Heterocyclic Chem

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Environmentally benign oxidation methods satisfy the postulates of green chemistry. Heterocyclic Noxides have applications in synthetic organic chemistry, chemotherapy and agrochemicals. Synthesis of Noxides using green oxidants will be attractive over the conventional methods. The presence of the N‐oxide group in the azine ring makes it more subject to electrophilic and nucleophilic attack and substantially expands the synthetic approaches for the modification of nitrogen‐containing heterocyclics. That is the reason for the increasing interest in the chemistry of heterocyclic N‐oxides. Some reactions adopted for oxidation of N‐heterocyclics have been discussed. Stereochemical and spectroscopic aspects have been mentioned. It will be advantageous if anchored catalysts are employed for industrial exploitation. Several physiochemical aspects of various methods have been discussed.

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