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Dibromobenzene isomers Common name and systematic name 1,2-Dibromobenzene: 1,3-Dibromobenzene [1] 1,4-Dibromobenzene [2] [3] [4] Structure Molecular formula: C 6 H 4 Br 2: Molar mass: 235.906 g/mol Appearance colorless liquid colorless liquid white solid CAS number [583-53-9] [108-36-1] [106-37-6] Properties Density and phase: 1.9940 g/ml ...
1,2-Dibromobenzene (o-dibromobenzene) is an aryl bromide and isomer of dibromobenzene. It is one of three isomers, the others being 1,3- and 1,4-dibromobenzene. It is a colorless liquid, although impure samples appear yellowish. The compound is a precursor to many 1,2-disubstituted derivatives of benzene.
The most widely used synthetic route to DBA utilizes electrophilic borylation chemistry as the key transformation, [6] [7] which dates to 1969 from Seibert et al. [8] and 1998 from Eisch et al. [9] Starting with the commercially available chemical 1,2-dibromobenzene, lithium-halogen exchange [10] followed by silylation yields 1,2-bis(trimethylsilyl) benzene as the intermediate.
2 and triphenylphosphine (PPh 3 ), tetrabutylammonium iodide (TBAI) as a phase-transfer catalyst , and sodium hydroxide as a base. Below is an example reaction of 1,3-dibromobenzene to isophthalic acid .
Bromobenzene is prepared by the action of bromine on benzene in the presence of Lewis acid catalysts such as aluminium chloride or ferric bromide. [3]Bromobenzene is used to introduce a phenyl group into other compounds.
1,3-Dibromobenzene has been used as a starting material in the synthesis of antiviral Lufotrelvir, in human clinical trials for the treatment of COVID-19. [3] The first step is formylation of 1,3-dibromobenzene to 2,6-dibromobenzaldehyde, by lithiation with lithium diisopropylamide in THF , followed by quenching with dimethylformamide .
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Sheet metal screws (sometimes called "sheet-metal self-tappers", P–K or PK screws from the brand name Parker Kalon, the company which pioneered [7] the manufacture of, but did not invent, these screws) are a type of screw which can form a thread in thin sheet metal. Pan-head self-tapping screws are common in metal cases for electrical ...
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