Recommanded Product: 271-95-4. So far, in addition to halogen atoms, other non-metallic atoms can become part of the aromatic heterocycle, and the target ring system is still aromatic. Compound: 1,2-Benzisoxazole, is researched, Molecular C7H5NO, CAS is 271-95-4, about Mechanism of the photoisomerization of isoxazoles and 2-cyanophenol to oxazoles.
The photolysis of indoxazene (I) to benzoxazole (III) has been shown to proceed by an isonitrile intermediate (II). Photolysis of I at -77° resulted in ir bands at 3350 and 2130 cm-1 characteristic of II which disappeared on warming and a new band at 1065 cm-1 formed characteristic of III. II was trapped as the formamide when the photolysis was performed in AcOH. The uv spectrum of II was measured by the photolysis of I to II at -77°. A similar uv spectrum was obtained by irradiation of 2-cyanophenol at -77°. The uv spectrum of III was observed on warming to room temperature suggesting the direct conversion of cyanophenol to II which then proceeds to benzoxazole. The conversion of I to III proceeds from a π,π* excited singlet and the conversion of I to cyanophenol proceeds via a n,π* triplet. Two intermediates were detected in the photolysis of IV. The first exhibited an ir band at 1695 cm-1 and is converted to the ketoisonitrile (V) on warming. V was characterized by ir bands at 2160 and 1725 cm-1 and is converted to the oxazole (VI) on further warming. VI was trapped as the formamide (VII) when the photolysis was performed in AcOH.
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Reference:
Highly efficient and robust molecular ruthenium catalysts for water oxidation,
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