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21702-84-1 Usage

Chemical Properties

light beige crystalline powder


2,4-Dibromo-1-methoxybenzene is a brominated flame retardant.

Check Digit Verification of cas no

The CAS Registry Mumber 21702-84-1 includes 8 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 5 digits, 2,1,7,0 and 2 respectively; the second part has 2 digits, 8 and 4 respectively.
Calculate Digit Verification of CAS Registry Number 21702-84:
81 % 10 = 1
So 21702-84-1 is a valid CAS Registry Number.

21702-84-1 Well-known Company Product Price

  • Brand
  • (Code)Product description
  • CAS number
  • Packaging
  • Price
  • Detail
  • Alfa Aesar

  • (A16200)  2,4-Dibromoanisole, 98+%   

  • 21702-84-1

  • 25g

  • 298.0CNY

  • Detail
  • Alfa Aesar

  • (A16200)  2,4-Dibromoanisole, 98+%   

  • 21702-84-1

  • 100g

  • 891.0CNY

  • Detail
  • Alfa Aesar

  • (A16200)  2,4-Dibromoanisole, 98+%   

  • 21702-84-1

  • 500g

  • 2683.0CNY

  • Detail



According to Globally Harmonized System of Classification and Labelling of Chemicals (GHS) - Sixth revised edition

Version: 1.0

Creation Date: Aug 17, 2017

Revision Date: Aug 17, 2017


1.1 GHS Product identifier

Product name 2,4-dibromo-1-methoxybenzene

1.2 Other means of identification

Product number -
Other names 2,4-Dibromo-1-methoxybenzene

1.3 Recommended use of the chemical and restrictions on use

Identified uses For industry use only.
Uses advised against no data available

1.4 Supplier's details

1.5 Emergency phone number

Emergency phone number -
Service hours Monday to Friday, 9am-5pm (Standard time zone: UTC/GMT +8 hours).

More Details:21702-84-1 SDS

21702-84-1Relevant articles and documents


Uemura, Sakae,Fukuzawa, Shin-Ichi,Wakasugi, Mikio,Okano, Masaya

, p. 319 - 324 (1981)

Some aryltellurium(IV) compounds react with iodine and bromine to give the corresponding aryl halides in good to moderate yields (iodo- and bromodetelluration).The addition of ammonium, cesium or potassium fluoride, antimony(V) chloride, and mercury(II) chloride accelerates the reaction in some cases.Compared to these halogenodetellurations, chlorodetelluration and cyanodetelluration of these compounds were very sluggish when various chlorinating agents and metal cyanides were used under several reaction conditions.

Eco-Friendly Methodology for the Formation of Aromatic Carbon–Heteroatom Bonds by Using Green Ionic Liquids

Richards, Kenza,Petit, Eddy,Legrand, Yves-Marie,Grison, Claude

supporting information, p. 809 - 814 (2020/11/30)

A new sustainable method is reported for the formation of aromatic carbon–heteroatom bonds under solvent-free and mild conditions (no co-oxidant, no strong acid and no toxic reagents) by using a new type of green ionic liquid. The bromination of methoxy arenes was chosen as a model reaction. The reaction methodology is based on only using natural sodium bromine, which is transformed into an electrophilic brominating reagent within an ionic liquid, easily prepared from the melted salt FeCl3 hexahydrate. Bromination reactions with this in-situ-generated reagent gave good yields and excellent regioselectivity under simple and environmentally friendly conditions. To understand the unusual bromine polarity reversal of sodium bromine without any strong oxidant, the molecular structure of the reaction medium was characterised by Raman and direct infusion electrospray ionisation mass spectroscopy (ESI-MS). An extensive computational investigation using density functional theory methods was performed to describe a mechanism that suggests indirect oxidation of Br? through new iron adducts. The versatility of the methodology was successively applied to nitration and thiocyanation of methoxy arenes using KNO3 and KSCN in melted hexahydrated FeCl3.

One-pot synthesis of 4-aryl-2-aminothiazoles from styrenes and thioureas promoted by tribromoisocyanuric acid

de Andrade, Vitor S.C.,de Mattos, Marcio C.S.

supporting information, (2020/07/03)

A simple and efficient one-pot protocol has been developed for the conversion of styrenes into 4-aryl-2-aminothiazoles using readily available starting materials. Tribromoisocyanuric acid was successfully used for the co-bromination and oxidation of styrenes to give phenacyl bromides, which in the presence of thioureas produced the corresponding 4-aryl-2-aminothiazoles in 48–70% yield. The protocol involves three reactions in one process: a tandem (formation of phenacyl bromides from styrenes) followed by a telescoped (conversion to thiazole) reaction.

Dehydroxymethyl Bromination of Alkoxybenzyl Alcohols by Using a Hypervalent Iodine Reagent and Lithium Bromide

Shibata, Ayako,Kitamoto, Sara,Fujimura, Kazuma,Hirose, Yuuka,Hamamoto, Hiromi,Nakamura, Akira,Miki, Yasuyoshi,Maegawa, Tomohiro

supporting information, p. 2275 - 2278 (2018/10/20)

We describe the dehydroxymethylbromination of alkoxybenzyl alcohol by using a hypervalent iodine reagent and lithium bromide in F 3 CCH 2 OH at room temperature. Selective monobromination or dibromination was possible by adjusting the molar ratios of hypervalent iodine reagent and lithium bromide.

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