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199728-18-2

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199728-18-2 Usage

General Description

2-Furancarboxylic acid, 3,4-dimethyl-, methyl ester (9CI) is a chemical compound with the molecular formula C8H10O3. It is a methyl ester derivative of 2-furancarboxylic acid, which is a furan carboxylic acid with two methyl groups attached to the third and fourth carbon atoms. This chemical is commonly used in the production of fragrances, flavorings, and pharmaceuticals, as well as in the synthesis of other organic compounds. It is a colorless liquid with a fruity odor and is flammable, making it important to handle with care. Additionally, it is important to follow proper safety guidelines and regulations when working with this chemical to avoid any potential hazards.

Check Digit Verification of cas no

The CAS Registry Mumber 199728-18-2 includes 9 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 6 digits, 1,9,9,7,2 and 8 respectively; the second part has 2 digits, 1 and 8 respectively.
Calculate Digit Verification of CAS Registry Number 199728-18:
(8*1)+(7*9)+(6*9)+(5*7)+(4*2)+(3*8)+(2*1)+(1*8)=202
202 % 10 = 2
So 199728-18-2 is a valid CAS Registry Number.

199728-18-2Relevant articles and documents

Synthesis and characterization of all-alkyl-substituted mono-, di-, and trioxosapphyrins

Sessler, Jonathan L.,Hoehner, Michael C.,Gebauer, Andreas,Andrievsky, Andrei,Lynch, Vincent

, p. 9251 - 9260 (1997)

The synthesis and characterization of the following heterosapphyrins is presented: 3,7,18,22-tetraethyl-2,8,12,13,17,23-hexamethyl-27-oxasapphyrin (5), 3,8,12,13,17,22-hexaethyl-2,7,18,23,-tetramethyl-15,29-dioxasapphyrin (6), and 3,7,18,22-tetraethyl-2,8,12,13,17,23-hexamethyl-15,27,29- trioxasapphyrin (7). These macrocycles were synthesized from the hitherto unknown precursors methyl 3,4-dimethylfuran-2-carboxylate (11) and methyl-4- ethyl-3-methylfuran-2-carboxylate (12). Single-crystals X-ray diffraction structures of the bis(hydrochloric acid) salt (5a) and the bis(trifluoroacetic acid) salt (5b) of 5 and of the bis(hydrochloric acid) salt (6a) of 6 were obtained. These structures are compared to those of the parent all-aza sapphyrin 4. In this context, we report the first solid-state structural analysis of a trifluoroacetic acid salt of sapphyrin (4b). Crystals of 5a are triclinic, space group P1 in a cell of the dimension a = 11.9686(13) A, b = 12.790(2) A, c = 16.236(2) A, α = 80.924(10)≡, β = 88.845(9)°, γ = 80.481(10)°, V = 2420.5(5) A3, F(000) = 1036, ρ = 1.38 g cm3, with Z = 2. Crystals of 5b are monoclinic, space group P21/c, in a cell of the dimensions a = 9.590(1) Am b = 33.911(3) Am c = 13.200(1) A, β = 94.931(6)°, V = 4276.8(6) A3, F(000) = 1904, ρ = 1.42 g cm3, with Z = 4. Crystals of 6a are triclinic, space group P1, in a cell of the dimensions a = 12.827(3) A, b = 13.116(3) A, c = 17.202(7) A, α = 82.89(2)°, β = 82.14(2)°, γ = 80.22(1)°, V = 2810(2) A3m F(000) = 1184, ρ = 1.36 g cm3, with Z = 2. Crystals of 4b are the triclinic, space group P1, in a cell of the dimensions a = 11.431(3) A, b = 11.562(2) A, c = 16.367(4) A, α = 88.07(2)°, β = 75.25(2)°, γ = 86.50(2), V = 2087.8(9) A3, F(000) = 872, ρ = 1.32, with Z = 2. The monooxasapphyrin salt 5a displays a structure very similar to that of the parent all- azasapphyrin (4a) in that one chloride anion is bound 1.936 A above and one chloride anion 1.814 A below the plane of the macrocycle. These distances are 1.774 and 1.877 A, respectively, for 4a. Almost the same behavior is found for 5b. Here, the carboxylate anions are bound 1.085 A above and 1.870 A below the plane of the macrocycle. These distances are 1.305 and 1.444 A, respectively, for 4b. Completely different behavior is observed in the case of 6a. In this instance, only one chloride anion is bound directly with a distance of 1.685 A above the plane of the macrocycle, while the other chloride anion is well removed from the dioxasapphyrin and solvated by four chloroform molecules.

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