Pyrans, thiopyrans, and selenopyrans
作者： J. Kuthan
DOI: 10.1016/S0065-2725(08)60822-3
关键词: Ring (chemistry) 、 Substitution reaction 、 Pyran 、 Double bond 、 Medicinal chemistry 、 Isomerization 、 Chemistry 、 Heteroatom 、 Reactivity (chemistry) 、 Disproportionation 、 Organic chemistry
摘要: Publisher Summary This chapter presents the literature for pyrans, thiopyrans, and selenopyrans. Pyran structure refers to a six-membered ring possessing one oxygen, sulfur, selenium, or telurium heteroatom singly bonded in cyclic system of two double bonds tetrahedral atomic center. The selenopyrans can be synthesized using acyclic precursors that indicate if pyran closure does not occur during synthesis. Reactions such as (1) oxidation, (2) disproportionation, (3) hydrogenation reduction, (4) desulfurization (5) isomerization, (6) ring-opening reactions, (7) substitution (8) conversion carbocyclic systems (outline chemical properties Pyrans are very rare natural products. Only some 2 H -pyrans have been isolated from plants. finally describes physical triazolopyridines electronic spectra, infrared nuclear magnetic resonance, mass other miscellaneous properties.
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