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Solid hexamethylbenzene occurs as colourless to white crystalline orthorhombic prisms or needles [20] with a melting point of 165–166 °C, [21] a boiling point of 268 °C, and a density of 1.0630 g cm −3. [20] It is insoluble in water, but soluble in organic solvents including benzene and ethanol. [20]
Alkylbenzene isomers can be differentiated by observing the position of alkyl substituents on the benzene ring using chemical ionization-proton exchange mass spectrometry. Conventional GC-MS yields limited results because the isomers have identical molecular weight and substituents.
As a reagent in organic chemistry, DBU is used as a ligand and base. As a base, protonation occurs at the imine nitrogen. [6] Lewis acids also attach to the same nitrogen. [7] These properties recommend DBU for use as a catalyst, for example as a curing agent for epoxy resins and polyurethane.
The boiling point for each isomer is around 140 °C (284 °F). The density of each isomer is around 0.87 g/mL (7.3 lb/US gal; 8.7 lb/imp gal) and thus is less dense than water. The odor of xylene is detectable at concentrations as low as 0.08 to 3.7 ppm (parts of xylene per million parts of air) and can be tasted in water at 0.53 to 1.8 ppm.
Organic compounds. Chemical formula Name CAS number CH 3 CHO: acetaldehyde: 75-07-0 CH 3 CO 2 H: acetic acid: ... List of water-miscible solvents. Add languages ...
The compound with the formula (C 5 H 5) 2 Fe 2 (CO) 4 exists as three isomers in solution. In one isomer the CO ligands are terminal. When a pair of CO are bridging, cis and trans isomers are possible depending on the location of the C 5 H 5 groups. [7] Another example in organometallic chemistry is the linkage isomerization of ...
An organic base is an organic compound which acts as a base. Organic bases are usually, but not always, proton acceptors. They usually contain nitrogen atoms, which can easily be protonated. For example, amines or nitrogen-containing heterocyclic compounds have a lone pair of electrons on the nitrogen atom and can thus act as proton acceptors. [1]
It is one of the three isomers of dimethylbenzene known collectively as xylenes. The m-stands for meta-, indicating that the two methyl groups in m-xylene occupy positions 1 and 3 on a benzene ring. It is in the positions of the two methyl groups, their arene substitution pattern, that it differs from the other isomers, o-xylene and p-xylene.