The reaction rate of a catalyzed reaction is faster than the reaction rate of the uncatalyzed reaction at the same temperature.14098-44-3, Name is Benzo-15-crown-5, molecular formula is C14H20O5. In a Article，once mentioned of 14098-44-3, Product Details of 14098-44-3
The sulfonation of 1,2-(methylenedioxy)benzene (2), 1,2-(ethylenedioxy)benzene (3), benzo-15-crown-5 (4), 2-methylanisole (5), 2,3-dihydrobenzofuran (7), 2,3-dihydrobenzopyran (chromane, 8) and dibenzo-30-crown-10 (9) in concentrated sulfuric acid and with sulfur trioxide mainly in nitromethane has been studied.Upon dissolution in sulfuric acid, 3 yields a mixture of 3-3-sulfonic acid (3-3-S) and 3-4-S in a ratio of 0.8, independent of the H2SO4 concentration.In sulfuric acid with a concentration greater than 83percent H2SO4, the two monosulfonic acids both eventually yield 3-3,5-S2.The ratio of rate coefficients of sulfonation of 3-3-S and 3-4-S is approximately 70.The reaction of the crown ethers 4 and 9 in sulfuric acid leads to formation of 4-4-S and to an equimolar mixture of 9-4,4′-S2 and 9-4,5′-S2, respectively.Sulfonation of 5 in 85 and 98percent H2SO4 yields a mixture of 5-4-S and 5-5-S in a ratio of approximately 7:1 and 11:1, respectively; in 98percent H2SO4, these products are converted into 5-4,6-S2 and 5-3,5-S2, respectively.On dissolving 5 in 105percent H2SO4, the initially observed product is 5-4,6-S2, which exhibits O-demethylation.Sulfonation of both 7 and 8 in 85percent H2SO4 yields a mixture of 4-S and 6-S in an initial ratio of 1.4.These acids eventually yield 7-4,6-S2 and 8-4,6-S2.The rate coefficients of sulfonation of 7-6-S and 8-6-S are both approximately 50 times those of the corresponding 4-sulfonic acid isomers.Upon sulfonation with 1.0 equiv. of SO3 in nitromethane, all the substrates studied yield the corresponding 4-sulfonic acid.Upon reaction with 2.0-4.0 equiv. of SO3, 2, 3, 7 and 8 all yield the 4,6-S2 almost quantitatively; 4 does not yield any disulfonic acid.Reaction of 9 with >/=2.0 equiv. of SO3 yields a 1.1 mixture of 4,4′-S2 and 4,5′-S2.The routes of the sulfonation of 1,2-(methylenedioxy)- (2) and 1,2-(ethylenedioxy)benzene (3) and their monosulfonic acids have been compared with those of 1,2-dimethoxybenzene (1) and its 4-sulfonic acid and the differences are discussed in terms of the Curtin-Hammett principle.The differences observed between the mono-and disulfonation of 2,3-dihydroxybenzofuran (7) and 2,3-dihydrobenzopyran (8) an the one hand and those of 2-methylanisole (5) on the other are discussed along similar lines.
The reactant in an enzyme-catalyzed reaction is called a substrate. Enzyme inhibitors cause a decrease in the reaction rate of an enzyme-catalyzed reaction.I hope my blog about 14098-44-3 is helpful to your research., Product Details of 14098-44-3