ChemicalBook CAS DataBase List 2,2',3,3',4,4',5,5',6-nonabromodiphenylether

2,2',3,3',4,4',5,5',6-nonabromodiphenylether synthesis

4synthesis methods

Product Name:2,2',3,3',4,4',5,5',6-nonabromodiphenylether
CAS Number:63387-28-0
Molecular formula:C12HBr9O
Molecular Weight:880.27

101-84-8 Synthesis

101-84-8
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$5.00/25g

2,2',3,3',4,4',5,5',6-nonabromodiphenylether

63387-28-0
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$479.00/1ml

1163-19-5
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$13.00/25g

Yield: 99.44 - 99.70 %Chromat. ， 0.233 - 0.526 %Chromat.

Reaction Conditions:

Stage #1:diphenylether with bromine at 40;
Stage #2: with bromine;aluminum (III) chloride at 56.5 - 78.4; under 1385.82 - 1458.22 Torr; for 3.65 - 4.36667 h;Product distribution / selectivity;

Steps:

9; 10
EXAMPLE 9; Preparation of Partially brominated DPO[0062] A batch of partially brominated DPO was prepared by slowly adding 131 g of bromine to 236 g of DPO while cooling in a water bath so that the temperature did not exceed 40⁰C. The resultant partially brominated DPO contained about 0.59 atom of bromine per molecule of DPO. Catalyzed Bromination[0063] In a 1 -liter jacketed reactor equipped with 0⁰C Friedrich condenser, mechanical stirrer, thermocouple well, and 1/32-inch LD. diptube was placed 4.0 g AlCl₃ and 1021 g of bromine. To this was fed 64.3 g of a portion of the above batch of partially brominated DPO.The feed rate was approximately 0.17 mL per minute with the condenser water set at +1⁰C. The feed occurred over a period of 4 hours and 17 minutes during which time the reaction temperature was maintained at 56.5 to 56.9⁰C. The mixture was refluxed for an additional period of about 5 minutes as the temperature rose to 59⁰C and then 450 mL of water was added to it. Bromine was distilled off from the reaction mixture up to a temperature of ca80⁰C. The amount of bromine collected was 502 g. Water was then decanted from the reaction mixture, and the remainder of the reaction mixture was stirred in 400 mL of water and this wash water was decanted. Then 500 mL of 2% NaOH was added. Product was collected and water washed. GC analysis showed 0.067% and 0.233% of the first and second nonabromodiphenyl oxide isomers, respectively, the second being the ortho isomer, and99.70% of decabromodiphenyl oxide. EXAMPLE 10Catalyzed Bromination[0064] Another portion of the same partially brominated DPO as used in Example 9 was used as the feed in this Example. The reactor was a 500 mL pressure reactor (Ace glassNo.6438-17) with jacket, equipped with a mechanical stirrer, a 1/32-inch diptube to feed the partially brominated diphenyl oxide, 1/4-inch O. D. diptube for takeoff, and a 9 inch x 3/4-inch LD. (ca. 22.8 cm x 1.91 cm) uninsulated fractionation column packed with 5 mm x 5 mm Raschig rings. The column was fitted at the top with a 0⁰C condenser. The condenser was connected to a backpressure regulator to maintain the desire pressure. To this reactor were changed 3.9 g OfAlCl₃ and 940 g of bromine. A 90 mL pressure bottle was charged with 59.8 g of the above partially brominated diphenyl oxide having about 0.6 bromine atom per molecule of diphenyl oxide. The pressure bottle was equalized with reactor via a nitrogen purge that entered the system at a back pressure regulator. The contents of the 500 mL pressure reactor were heated to a refluxing temperature of 78.4°C at a pressure of 12.1 psig(ca. 1.85x 10⁵ Pa). Then a feed of the partially brominated DPO was maintained at a flow rate of about 0.17 niL per minute for an overall period of about 3 hours and 39 minutes. The reaction mixture was maintained at a temperature of 74.3⁰C to 76.2⁰C and at 12.1 to 13.5 psig (ca. 1.85x10⁵ to 1.94x10⁵ Pa) pressure. Operational difficulties in the system were encountered during this time. Nevertheless, 100 mL of water was then charged to the reactor and the reaction mixture was poured into a 1 -liter flask. The reaction mixture was stripped of bromine up to a temperature of 100⁰C. Solids remaining in the reactor were treated with dilute sodium hydroxide solution and combined with the product that had been stripped. This mixture was filtered and washed giving a product containing 0.034% and 0.526% of the first and second nonabromodiphenyl oxide isomers, respectively, the second being the ortho isomer, and 99.44% of DBDPO.