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Spiro(3,4-dihydroisocoumarin-3'-phthalide) is a complex organic compound characterized by a unique spiro structure, which consists of two rings sharing a common atom. This particular compound features a 3,4-dihydroisocoumarin ring fused with a phthalide ring. The 3,4-dihydroisocoumarin ring is a reduced form of isocoumarin, which is an isomer of coumarin, while the phthalide ring is a cyclic ester derived from phthalic anhydride. The compound is known for its potential applications in various fields, including pharmaceuticals and materials science, due to its interesting chemical properties and structural features.

894-22-4

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894-22-4 Usage

Check Digit Verification of cas no

The CAS Registry Mumber 894-22-4 includes 6 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 3 digits, 8,9 and 4 respectively; the second part has 2 digits, 2 and 2 respectively.
Calculate Digit Verification of CAS Registry Number 894-22:
(5*8)+(4*9)+(3*4)+(2*2)+(1*2)=94
94 % 10 = 4
So 894-22-4 is a valid CAS Registry Number.

894-22-4Relevant academic research and scientific papers

Novel Reactions: Part II - Homologous Condensations of Phthalic and Homophthalic Anhydrides; 13C NMR and Mechanism of Formation of Isocoumarins

Ayyangar, N. R.,Srinivasan, K. V.

, p. 1108 - 1115 (2007/10/02)

The condensations of phthalic and homophthalic anhydrides with homophthalic acid do not yield the corresponding diketones (5 and 10) and/or their tautomeric enols, but give the corresponding isocoumarin derivatives (6 and 11) along with their spirodilactones (7 and 12).The UV, IR, PMR and mass spectral data suggest either the isocoumarin or the diketonic structures for the products.However, the structures have been unambiguously established by 13C NMR spectroscopic analysis.A plausible mechanism for the formation of isocoumarins has also been discussed.

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