4-Bromobenzaldehyde

4-Bromobenzaldehyde
Names
	Preferred IUPAC name 4-Bromobenzaldehyde
	Other names p-Bromobenzaldehyde
Identifiers
CAS Number	1122-91-4 ;
3D model (JSmol)	Interactive image;
ChEMBL	ChEMBL3753357;
ChemSpider	63906 ;
ECHA InfoCard	100.013.060
EC Number	214-365-0;
PubChem CID	70741;
UNII	4L8VM24F65 ;
CompTox Dashboard (EPA)	DTXSID5061534 ;
	InChI InChI=InChI = 1S/C7H5BrO/c8-7-3-1-6(5-9)2-4-7/h1-5H Key: ZRYZBQLXDKPBDU-UHFFFAOYSA-N ;
	SMILES C1=CC(=CC=C1C=O)Br;
Properties
Chemical formula	C7H5BrO
Molar mass	185.020 g·mol−1
Appearance	white solid
Odor	almond
Melting point	57 °C (135 °F; 330 K)
Boiling point	255–258 °C (491–496 °F; 528–531 K)
Hazards
	GHS labelling:
Pictograms
Signal word	Danger
Hazard statements	H302, H315, H319, H334, H335
Precautionary statements	P233, P260, P261, P264, P264+P265, P270, P271, P280, P284, P301+P317, P302+P352, P304+P340, P305+P351+P338, P319, P321, P330, P332+P317, P337+P317, P342+P316, P362+P364, P403, P403+P233, P405, P501
Related compounds
Related compounds	3-Bromobenzaldehyde
	Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa). Infobox references

4-Bromobenzaldehyde, or p-bromobenzaldehyde, is an organobromine compound with the formula BrC₆H₄CHO. It is one of three isomers of bromobenzaldehyde.^[3] It displays reactivity characteristic of benzaldehyde and an aryl bromide.

Preparation

4-Bromobenzaldehyde may be prepared in the laboratory in two steps by oxidation 4-bromotoluene.^[4] In the first step, two bromine atoms are added to the methyl group of 4-bromotoluene by free radical bromination to form 4-bromobenzal bromide. In the second step, the dibrominated methyl group is hydrolyzed with calcium carbonate, then steam distilled to collect 4-bromobenzaldehyde.

Reactions

Owing to the bromoaryl group, 4-bromobenzaldehyde participates in various cross coupling reactions, such as Suzuki coupling.^[5] In a Sonogashira coupling it couples with trimethylsilylacetylene to form 4-((trimethylsilyl)ethynyl)benzaldehyde, precursor to 4-ethynylbenzaldehyde.^[6]

References

^ ^a ^b "4-Bromobenzaldehyde". ChemSpider. Retrieved 21 October 2023.
^ "4-Bromobenzaldehyde Safety and Hazards". PubChem. U.S. National Library of Medicine.
^ "4-Bromobenzaldehyde". PubChem. U.S. National Library of Medicine. Retrieved 2023-10-22.
^ Coleman GH, Honeywell GE (1937). "p-Bromobenzaldehyde". Organic Syntheses. 17: 20. doi:10.15227/orgsyn.017.0020.
^ Huff BE, Koenig TM, Mitchell D, Staszak MA (1998). "Synthesis of Unsymmetrical Biaryls Using a Modified Suzuki Cross-Coupling: 4-Biphenylcarboxaldehyde". Organic Syntheses. 75: 53. doi:10.15227/orgsyn.075.0053.
^ Xu X, Cai P, Chen H, Zhou HC, Huang N (October 2022). "Three-Dimensional Covalent Organic Frameworks with she Topology". Journal of the American Chemical Society. 144 (40): 18511–18517. doi:10.1021/jacs.2c07733. PMID 36170014. S2CID 252566430.

[chemspider-1] "4-Bromobenzaldehyde". ChemSpider. Retrieved 21 October 2023.

[2] "4-Bromobenzaldehyde Safety and Hazards". PubChem. U.S. National Library of Medicine.

[3] "4-Bromobenzaldehyde". PubChem. U.S. National Library of Medicine. Retrieved 2023-10-22.

[4] Coleman GH, Honeywell GE (1937). "p-Bromobenzaldehyde". Organic Syntheses. 17: 20. doi:10.15227/orgsyn.017.0020.

[5] Huff BE, Koenig TM, Mitchell D, Staszak MA (1998). "Synthesis of Unsymmetrical Biaryls Using a Modified Suzuki Cross-Coupling: 4-Biphenylcarboxaldehyde". Organic Syntheses. 75: 53. doi:10.15227/orgsyn.075.0053.

[6] Xu X, Cai P, Chen H, Zhou HC, Huang N (October 2022). "Three-Dimensional Covalent Organic Frameworks with she Topology". Journal of the American Chemical Society. 144 (40): 18511–18517. doi:10.1021/jacs.2c07733. PMID 36170014. S2CID 252566430.

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