Electric Literature of 14963-96-3, Chemistry is the science of change. But why do chemical reactions take place? Why do chemicals react with each other? The answer is in thermodynamics and kinetics.In a document type is Article, and a compound is mentioned, 14963-96-3, 4-Methoxyisobenzofuran-1,3-dione, introducing its new discovery.
Crystal structures of highly stabilized ylides: Methyl(3-methoxy,2-methoxycarbonylbenzoyl)triphenylphosphoranylideneacetate and methyl(2-methoxycarbonyl,6-nitrobenzoyl)triphenylphosphoranylideneacetate and the salt methyl(triphenylphosphoranylidene)acetate tetrafluoroborate
At lower temperatures stabilized ylides react with unsymmetrically substituted phthalic anhydrides to give two acyclic adducts. When the reactions are allowed to proceed at higher temperature enol lactones are formed. Identification of the acyclic intermediates was necessary to understand the mechanism of these Wittig reactions. The transient species trapped in the reaction with trimethyloxonium tetrafluoroborate were unambiguously identified by crystallographic methods. The crystal structures of the tetrafluoroborate salt of methyl(triphenylphosphoranylidene)-acetate (8), methyl(3-methoxy,2-methoxycarbonylbenzoyl)triphenylphosphoranylideneacetate (6beta), and methyl(2-methoxycarbonyl,6-nitrobenzoyl)triphenylphosphoranylideneacetate (7alpha) were studied by X-ray diffraction. The ionic salt (8) is monoclinic, P21/c, a = 12.640(5), b = 13.945(9), c = 14.825(6) A, beta = 125.32(3), Z = 4, and R = 0.065 (F > 5.4 sigma(F)). Crystal 6beta is monoclinic, P21/c, a = 16.391(16), b = 9.029(6), c = 19.835(19) A, beta = 116.60(6), Z = 4, and R = 0.070 (F > 4.6 sigma(F)), while crystal 7alpha is also monoclinic, P21/c, a = 9.513(5), b = 9.361(3), c = 30.908(13) A, beta = 98.42(3), Z = 4, and R = 0.057 (F > Ssigma(F)). In the BF4- salt (12), the four P – C distances are equal (1.791(5)-1.801(7) A) with identical tetrahedral angles. For the two triphenylphosphoranylideneacetate compounds, the fourth P-C(1) bond is shorter (1.762(6)-1.734(5) A) than the three P-C(Ph) bonds (avg. 1.809(5) A). The angles C(1)-P-C(Ph) are also larger (avg. 112.9(2) for 6beta and 111.9(2) for 7alpha) than the C(Ph)-P-C(Ph) angles (avg. 105.8(2) for 6beta and 106.9(2) for 7alpha). These values suggest a multiple nature for the P-C(1) bond. In the nitro derivative, the nitro and the ester groups are disordered equally in positions 2 and 6.
Balanced chemical reaction does not necessarily reveal either the individual elementary reactions by which a reaction occurs or its rate law.Electric Literature of 14963-96-3. In my other articles, you can also check out more blogs about 14963-96-3
Reference£º
Benzofuran – Wikipedia,
Benzofuran | C8H2880O – PubChem