Most of the natural products isolated at present are heterocyclic compounds, so heterocyclic compounds occupy an important position in the research of organic chemistry. A compound: 288-42-6, is researched, SMILESS is O1C=NC=C1, Molecular C3H3NOJournal, Article, Journal of Physical Chemistry A called Time-Resolved Photoelectron Spectroscopy Studies of Isoxazole and Oxazole, Author is Geng, Ting; Ehrmaier, Johannes; Schalk, Oliver; Richings, Gareth W.; Hansson, Tony; Worth, Graham; Thomas, Richard D., the main research direction is isoxazole oxazole time resolved photoelectron spectroscopy.Category: oxazolidine.
The excited state relaxation pathways of isoxazole and oxazole upon excitation with UV-light were investigated by nonadiabatic ab initio dynamics simulations and time-resolved photoelectron spectroscopy. Excitation of the bright ππ*-state of isoxazole predominantly leads to ring-opening dynamics. Both the initially excited ππ*-state and the dissociative πσ*-state offer a combined barrier-free reaction pathway, such that ring-opening, defined as a distance of more than 2 Å between two neighboring atoms, occurs within 45 fs. For oxazole, in contrast, the excited state dynamics is about twice as slow (85 fs) and the quantum yield for ring-opening is lower. This is caused by a small barrier between the ππ*-state and the πσ*-state along the reaction path, which suppresses direct ring-opening. Theor. findings are consistent with the measured time-resolved photoelectron spectra, confirming the timescales and the quantum yields for the ring-opening channel. The results indicate that a combination of time-resolved photoelectron spectroscopy and excited state dynamics simulations can explain the dominant reaction pathways for this class of mols. As a general rule, we suggest that the antibonding σ*-orbital located between the oxygen atom and a neighboring atom of a five-membered heterocyclic system provides a driving force for ring-opening reactions, which is modified by the presence and position of addnl. nitrogen atoms.
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Oxazolidine – Wikipedia,
Oxazolidine | C3H7NO – PubChem