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PhB(OH) 2 + 2 ROH ⇌ PhB(OR) 2 + 2 H 2 O. As an extension of this reactivity, PhB(OH) 2 can be used as a protecting group for diols and diamines. This reactivity is the basis of the use of phenylboronic acid's use as a receptor and sensor for carbohydrates, antimicrobial agents, and enzyme inhibitors, neutron capture therapy for cancer ...
A simple example is provided by the effect of replacing the hydrogen atoms in acetic acid by the more electronegative chlorine atom. The electron-withdrawing effect of the substituent makes ionisation easier, so successive pK a values decrease in the series 4.7, 2.8, 1.4, and 0.7 when 0, 1, 2, or 3 chlorine atoms are present. [49]
The higher the proton affinity, the stronger the base and the weaker the conjugate acid in the gas phase.The (reportedly) strongest known base is the ortho-diethynylbenzene dianion (E pa = 1843 kJ/mol), [3] followed by the methanide anion (E pa = 1743 kJ/mol) and the hydride ion (E pa = 1675 kJ/mol), [4] making methane the weakest proton acid [5] in the gas phase, followed by dihydrogen.
Cyclopentane is a minor component of automobile fuel, with its share in US gasoline varying between 0.2 and 1.6% in early 1990s [8] and 0.1 to 1.7% in 2011. [9] Its research and motor octane numbers are reported as 101 or 103 and 85 or 86 respectively. [10] [11]
The cyclopentadienyl anion is a planar, cyclic, regular-pentagonal ion; it has 6 π-electrons (4n + 2, where n = 1), which fulfills Hückel's rule of aromaticity. Each double bond and lone pair provides 2 π-electrons, which are delocalized into the ring. [4] Cyclopentadiene has a pKa of about 16.
4-Nonylphenylboronic acid is a potent and selective inhibitor of the enzyme fatty acid amide hydrolase (FAAH), with an IC 50 of 9.1nM, and 870x selectivity for FAAH over the related enzyme MAGL, which it inhibits with an IC 50 of 7900nM. [1]
Pentafluorobenzene is an organofluoride compound with the molecular formula C 6 HF 5. [1] The compound consists of a benzene ring substituted with five fluorine atoms. [2] The substance is a colorless liquid with a boiling point similar to that of benzene.
2 c 6 h 5 oh + ch 3 c(o)ch 2 ch 2 cooh → ch 3 c(p-c 6 h 4 oh) 2 ch 2 ch 2 cooh + h 2 o Diphenolic acid is a solid at room temperature, melting at 168–171 °C and boiling at 507 °C. According to its MSDS , diphenolic acid is soluble in ethanol , isopropanol , acetone , acetic acid , and methyl ethyl ketone , but insoluble in benzene ...