1-Bromopropane vs 2-Bromopropane
Jun 23,2026
1-Bromopropane is characterized by low ozone depletion potential, high volatility, and non-flammability, and is mainly used as a cleaning agent and solvent. Especially after 2-bromopropane was phased out due to its reproductive toxicity, it has become an important industrial alternative. 1-Bromopropane is widely used as a cleaning agent for electronic components, precision optical instruments, and aerospace parts, and as a solvent for adhesives in the manufacture of foam plastics and furniture.

2-Bromopropane was initially used as a substitute for ozone-depleting solvents in South Korea and Japan. However, after its reproductive and hematopoietic toxicity was confirmed, its isomer, 1-bromopropane, was used as a new alternative. Currently, this substance is banned in the workplace.
Toxicity Differences
Both 1-Bromopropane and 2-Bromopropane are harmful to humans, mainly in terms of neurotoxicity, reproductive toxicity, hematologic toxicity, mutagenicity, and other toxicities. See the table below for details[1-2]:
| Toxicity type | 1-Bromopropane | 2-Bromopropane |
| Neurotoxicity | Extremely high. Much stronger than 2-bromopropane. Accompanied by severe neuropathy, manifested as hindlimb paralysis, decreased grip strength, slowed motor nerve conduction velocity, prolonged distal latency, axonal swelling, and central nervous system depression. | Milderly peripheral nerve changes, not involving the central nervous system. |
| Reproductive toxicity | It has reproductive toxicity, but its target cells differ from those of 2-bromopropane. 1-bromopropane primarily interferes with sperm production (affecting Sertoli cells) and female follicle development (affecting antral follicles and developing follicles), reducing female fertility. | It has reproductive toxicity. 2-bromopropane directly attacks oocytes in spermatogonia and primordial follicles, leading to spermatogenic cell loss and reduced follicle count. Manifestations include oligospermia, amenorrhea, and anemia. |
| Hematologic toxicity | No definite hematologic toxicity was observed even at high concentrations. | It exhibits significant myelotoxicity and pancytopenia; reduces hematocrit; causes bone marrow hypoplasia, with replacement by adipose tissue. |
| Mutagenicity and other | Causes hepatocellular degeneration and increased kidney weight | 2-Bromopropane has higher mutagenicity than 1-bromopropane |
References
[1] ICHIHARA G. Neuro-reproductive toxicities of 1-bromopropane and 2-bromopropane.[J]. International Archives of Occupational and Environmental Health, 2005, 78 2: 79-96. DOI:10.1007/s00420-004-0547-9.
[2] G ICHIHARA. 1-Bromopropane, an alternative to ozone layer depleting solvents, is dose-dependently neurotoxic to rats in long-term inhalation exposure.[J]. Toxicological Sciences, 2000, 55 1: 116-123. DOI:10.1093/toxsci/55.1.116.
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