ChemicalBook CAS DataBase List 2,3-Dibromopropene

2,3-Dibromopropene synthesis

6synthesis methods

Product Name:2,3-Dibromopropene
CAS Number:513-31-5
Molecular formula:C3H4Br2
Molecular Weight:199.87

107-19-7
5 suppliers
$12.00/25g

106-96-7 Synthesis

106-96-7
337 suppliers
$30.00/25g

627-15-6
25 suppliers
$97.50/5g

513-31-5
166 suppliers
$16.00/1g

Yield:106-96-7 64.37% ，513-31-5 10.26% ，627-15-6 2.54%

Reaction Conditions:

with phosphorus tribromide in isopar C at 6 - 50; for 3.71667 h;Product distribution / selectivity;

Steps:

1 Example 1
Example 1 Isopar C (343 g) was charged to a reactor.propargyl alcohol (175 g, 3.1 mol) and phosphorus tribromide (295.7 g, 1.09 mol) were fed separately but concurrently to the reactor at feed rates of about 2.5 ML/minute, while maintaining the temperature of the reaction mixture in the reactor at 6° C. Addition lasted for about 43 minutes, during which time this reaction mixture was stirred at a rate of 17 rpm.The reaction mixture was warmed to 50° C. and allowed to ride, with stirring, for 3 hours at 50° C. The mixture was then washed twice with water (10.7 g and 10 g), and the solution was allowed to stand to form aqueous and organic layers; the layers were separated.The organic layer was analyzed by NNMR. The yield of propargyl bromide was 64.37%.The solution also contained 10.26% 2,3-dibromopropene, 2.54% 1,3-dibromopropene, but no bromoallene.

References:

Mero, Christopher L.;Elnagar, Hassan Y.;Herndon JR., Robert C. US2004/44259, 2004, A1 Location in patent:Page 3

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