1653-19-6

Usage

Purification Methods

Crystallise it from pentane to constant melting point of -40o. A mixture of meso and d,l forms is separated by gas chromatography on an 8m stainless steel column (8mm i.d.) with 20% DEGS (diethyleneglycolsilyl chloride) on Chromosorb W (60-80 mesh) at 60o and 80mL He/min. Distil it under vacuum. [Su & Ache J Phys Chem 80 659 1976.]

InChI:InChI=1/C4H4Cl2/c1-3(5)4(2)6/h1-2H2

Upstream product

• 28507-96-2 meso-1,2,3,4-tetrachlorobutane 
• 3405-32-1 racem.-1,2,3,4-Tetrachlorbutan 
• 2431-50-7 2,3,4-trichloro-1-butene 
• 92333-82-9 trimethyl-(2,3,3-trichloro-butyl)-ammonium; iodide 
• 126-99-8 chloroprene 
• 926-57-8 1,3-dichloro-2-butene 
• 34450-24-3 trans-1,2,3-trichloro-2-butene 
• 57124-86-4 1,2-dichloro-1-fluoro-2-methylcyclopropane 
• 67-66-3 chloroform 
• 3405-32-1 1,2,3,4-tetrachlorobutane 
• 92335-35-8 trimethyl-(2,2,3-trichloro-butyl)-ammonium; iodide 
• 130894-82-5 1,2,2-trichloro-1-methylcyclopropane 
• 110-65-6 1,4-dihydroxybut-2-yne 

Downstream Products

• 22554-09-2 4,5-dichloro-cyclohexene-⁽⁴⁾-dicarboxylic acid-(1r.2c) 
• 1573-57-5 1,2,2,3,3,4-hexachlorobutane 
• 854905-94-5 1,2,4-trichloro-4-(1-chloro-vinyl)-cyclohexene 
• 90003-65-9 4,5-Dichlor-Δ⁴-tetrahydrophthalsaeure 
• 22621-64-3 cis-4,5-Dichlor-cyclohexen-⁽⁴⁾-dicarbonsaeure-(1,2)-diethylester 
• 56962-08-4 4,5-dichlorophthalic acid 
• 13363-99-0 3,4-Dichlor-1-methyl-1,2,5,6-tetrahydro-benzoesaeure 
• 14205-23-3 3,4-Dichlor-1,2,5,6-tetrahydro-benzoesaeure-butylester 
• 6436-71-1 5-(1-chloro-vinyl)-3-(3-nitro-phenyl)-isoxazole 
• 6436-72-2 3,3'-bis-(3-nitro-phenyl)-[5,5']biisoxazolyl 
• 5611-94-9 4,5-Dichlor-1-<4-brom-benzolsulfonylimino>-2-<4-brom-benzolsulfonyl>-3,6-dihydro-1,2-thiazin 
• 5611-96-1 4,5-dichloro-2-(4-fluoro-benzenesulfonyl)-1-(4-fluoro-benzenesulfonylimino)-1,2,3,6-tetrahydro-1λ⁴-[1,2]thiazine 
• 5550-91-4 4,5-dichloro-2-(4-methoxy-benzenesulfonyl)-1-(4-methoxy-benzenesulfonylimino)-1,2,3,6-tetrahydro-1λ⁴-[1,2]thiazine 
• 5550-92-5 2-benzenesulfonyl-1-benzenesulfonylimino-4,5-dichloro-1,2,3,6-tetrahydro-1λ⁴-[1,2]thiazine 

Relevant academic research and scientific papers

Gas-phase pyrolysis of 1-chloro-1-fluoro-2-methylcyclopropanes in the presence of SiO2 or Al2O3 with the formation of 2-chloro- or 2-fluorobuta-1,3-dienes

Gas-phase pyrolysis of of 1-chloro-1-fluoro-2-methylcyclopropanes in an empty or filled with quartz pieces flow-tube reactor at 430 - 460 °C gives 2-fluorobuta-1,3-dienes (in 42 - 75% yields), whereas pyrolysis in the presence of Al2O3 at 150 - 250 °C gives 2-chlorobuta-1,3-dienes as the major products (in 58 - 68% yield).

Thermal cyclopropyl—allyl rearrangement of gem-chlorofluorocyclopropanes under gas-phase pyrolysis conditions. Formation of chlorofluoroalkenes and 2-fluorobuta-1,3-dienes

The gas-phase pyrolysis of isomeric 2-chloro-2-fluoro-1-phenylcyclopropanes in a flow reactor at 250–430 °С gives 1-phenyl- and 3-phenyl-3-chloro-2-fluoropropenes. Under similar conditions, methyl-substituted gem-chlorofluorocyclopropanes undergo cyclopropyl—allyl isomerization accompanied by dehydrochlorination to form chlorofluoroalkenes and 2-fluoro-buta-1,3-dienes.

[5]Radialene

The [n]radialenes are a unique family of fundamental [n]-membered carbocyclic structures with radiating alkenes, which have attracted significant synthetic and theoretical attention. Whereas [3]-, [4]-, and [6]radialenes have been prepared and studied, all efforts to synthesize the five-membered ring compound have thus far met with failure. Here we describe the first synthesis of the fundamental hydrocarbon [5]radialene, C10H10. Our approach was a departure from previous radialene syntheses in that it utilized a low-temperature decomplexation of a stable organometallic compound, rather than high-temperature elimination or rearrangement. Our strategy was guided by analysis of previous radialene syntheses, which indicated rapid decomposition in oxygen, and ab initio calculations, which revealed an extraordinary susceptibility of [5]radialene to undergo Diels-Alder dimerization/polymerization. The origin of this susceptibility was traced to a small distortion energy associated with the formation of the transition structure geometry from the relaxed reactant monomers and to a narrow HOMO-LUMO gap.

AN IMPROVED PROCESS FOR THE PREPARATION OF 2,3,-DICHLORO 1,3,BUTADIENE FROM 1,3 BUTADIENE

The present invention relates to an improved process for the production of 2,3-Dichloro 1,3-Butadiene which comprises Chlorinating Butadiene, in liquid phase, in the presence of chlorinated solvents and phase transfer catalyst, Distilling the solvent, Distilling the formed 3,4-dichlorobutene-1, 1,4-dichlorobutene-2; and 1,2,3,4-Tetrachlorbutane; under reduced pressure,chlorinating the separated 3,4-dichlorobutene-1 and 1,4-dichlorobutene-2 to give 1,2,3,4-Tetrachlorobutane.,double Dehydrochlorinating the 1,2,3,4-Tetrachlorobutane using methanol,alkali and inhibitors under atmosphere of 1% oxides of nitrogen in nitrogen atmosphere the total period of Dehydrochlorinating being in the range of 15-33 hours to give 2,3-Dichloro 1,3-Butadiene and separating methanol to get 2,3-Dichloro 1,3-Butadiene

PROCESS FOR PRODUCTION OF 2,3-DICHLOROBUTADIENE-1,3

2,3-dichlorobutadiene-1,3 of high purity is produced from 1,2,3,4-tetrachlorobutane by a process comprising the steps of dehydrochlorination, chlorination of the reaction product obtained in the dehydrochlorination step and subsequent separation of a 2,3-dichlorobutadiene-1,3 composition from the reaction product of the chlorination step.

Preparation of halogenated phthalic anhydrides

A process for the aromatization of 4-chlorotetrahydrophthalic anhydride and 4,5-dichlorotetrahydrophthalic anhydride which comprises heating a solution of either substance in the presence of activated carbon and in the partial absence of air.