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4-Isobenzofurancarboxylic acid, 1,3-dihydro-3-oxo-, also known as 3-oxo-1,3-dihydro-4-isobenzofurancarboxylic acid, is a chemical compound with the molecular formula C9H6O4. It is a derivative of isobenzofuran, a heterocyclic aromatic compound consisting of a benzene ring fused to a furan ring. The 3-oxo group indicates the presence of a carbonyl group at the 3-position, while the 1,3-dihydro prefix signifies that the compound has two hydrogen atoms added to the 1 and 3 positions, making it a partially saturated isobenzofuran. 4-Isobenzofurancarboxylic acid, 1,3-dihydro-3-oxo- has potential applications in the synthesis of various pharmaceuticals, agrochemicals, and other specialty chemicals due to its unique structure and reactivity.

4792-28-3

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4792-28-3 Usage

Check Digit Verification of cas no

The CAS Registry Mumber 4792-28-3 includes 7 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 4 digits, 4,7,9 and 2 respectively; the second part has 2 digits, 2 and 8 respectively.
Calculate Digit Verification of CAS Registry Number 4792-28:
(6*4)+(5*7)+(4*9)+(3*2)+(2*2)+(1*8)=113
113 % 10 = 3
So 4792-28-3 is a valid CAS Registry Number.

4792-28-3Upstream product

4792-28-3Relevant academic research and scientific papers

DIELS-ALDER REACTION WITH FURANICS TO OBTAIN AROMATICS

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, (2020/03/23)

The present invention is directed to the preparation of phthalic anhydride compounds and the intermediate phthalide compounds. In particular, the invention is directed to an improved bio-based route from furanic compounds to phthalic anhydride compounds by reacting furfuryl alcohol (i.e. 2-hydroxymethylfuran) or an analogue thereof having a nucleophilic atom on the 2-methyl, with a dienophile comprising an α,β-unsaturated carbonyl comprising an α'-leaving group. The inventions further involved preparation of phthalic anhydride compounds, phthalic acid compounds and reduction products of the intermediate phthalide compounds.

DIELS- ALDER RING-OPENING PROCESS

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Page/Page column 24, (2019/11/19)

The invention is directed to a process for the ring-opening of a cycloadduct of formula I obtainable from a reaction of a furanic compound and a diene, said process comprising contacting the cycloadduct with an acidic mixture comprising sulfuric acid and an activating agent to obtain a ring-opened product. The present invention is particularly directed a continuous process.

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