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Chemistry is traditionally divided into organic and inorganic chemistry. Recommanded Product: 2-Methylbenzofuran, The former is the study of compounds containing at least one carbon-hydrogen bonds.In a patent，Which mentioned a new discovery about 4265-25-2
Phenyl allenyl ethers undergo Claisen rearrangement under electron impact conditions producing intense ions.Another competing fragmentation pathway in these compounds is an intramolecular aromatic substitution followed by the loss of H or the substituent to give rise to fragments corresponding to benzopyrilium cations.Electron-withdrawing substituents on the phenyl ring favour the cyclization reaction.An interesting ortho interaction of the nitro group with the allenic moiety leads to the expulsion of CO2 from the molecular ion.The proposed fragmentation pathways and the ion structures are established with the help of linked-scan spectra (B/E, B2/E), collision activation decomposition spectra and high-resolution data.
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Reference：
Benzofuran – Wikipedia,
Benzofuran | C8H252O – PubChem