n-butylamine n-butylamine n-butylamine is an organic compound (specifically, an amine) with the formula ch3(ch2)3nh2. this colourless liquid is one of the four isomeric amines of butane, the others being sec-butylamine, tert-butylamine, and isobutylamine. it is a liquid having the fishy, ammonia-like odor common to amines. the liquid acquires a yellow color upon storage in air. it is soluble in all organic solvents. its vapours are heavier than air and it produces toxic oxides of nitrogen during combustion. n-butylamine names preferred iupac name butan-1-amine other names 1-aminobutane1-butanaminemonobutylamine identifiers cas number 109-73-9 y 3d model (jsmol) interactive image abbreviations nba beilstein reference 605269 chebi chebi:43799 n chembl chembl13968 y chemspider 7716 y drugbank db03659 n echa infocard 100.003.364 ec number 203-699-2 gmelin reference 1784 mesh n-butylamine pubchem cid 8007 rtecs number eo29750002 unii n2qv60b4wr n un number 1125 comptox dashboard (epa) dtxsid1021904 inchi inchi=1s/c4h11n/c1-2-3-4-5/h2-5h2,1h3 ykey: hqabupzfayxkjw-uhfffaoysa-n y smiles ccccn properties chemical formula c4h11n molar mass 73.139 g·mol−1 appearance colorless liquid odor fishy, ammoniacal density 740 mg ml−1 melting point −49 °c; −56 °f; 224 k boiling point 77 to 79 °c; 170 to 174 °f; 350 to 352 k solubility in water miscible log p 1.056 vapor pressure 9.1 kpa (at 20 °c) henry's lawconstant (kh) 570 μmol pa−1 kg−1 basicity (pkb) 3.22 magnetic susceptibility (χ) -58.9·10−6 cm3/mol refractive index (nd) 1.401 viscosity 500 µpa s (at 20 °c) thermochemistry heat capacity (c) 188 j k−1 mol−1 std enthalpy offormation (δfh⦵298) −128.9–−126.5 kj mol−1 std enthalpy ofcombustion (δch⦵298) −3.0196–−3.0174 mj mol−1 hazards ghs labelling: pictograms signal word danger hazard statements h225, h302, h312, h314, h332 precautionary statements p210, p280, p305+p351+p338, p310 nfpa 704 (fire diamond) 2 3 0 flash point −7 °c (19 °f; 266 k) autoignitiontemperature 312 °c (594 °f; 585 k) explosive limits 1.7–9.8% lethal dose or concentration (ld, lc): ld50 (median dose) 366 mg kg−1 (oral, rat)626 mg kg−1 (dermal, rabbit)430 mg kg−1 (oral, mouse)430 mg kg−1 (oral, guinea pig) lclo (lowest published) 4000 ppm (rat, 4 hr)263 ppm (mouse, 2 hr) niosh (us health exposure limits): pel (permissible) c 5 ppm (15 mg/m3) rel (recommended) c 5 ppm (15 mg/m3) idlh (immediate danger) 300 ppm safety data sheet (sds) hazard.com related compounds related alkanamines propylamineisopropylamine1,2-diaminopropane1,3-diaminopropaneisobutylaminetert-butylaminesec-butylamineputrescinepentylaminecadaverine related compounds 2-methyl-2-nitrosopropane except where otherwise noted, data are given for materials in their standard state (at 25 °c , 100 kpa). n verify (what is yn ?) infobox references synthesis and reactions it is produced by the reaction of ammonia and alcohols over alumina: ch3(ch2)3oh + nh3 → ch3(ch2)3nh2 + h2o n-butylamine is a weak base. the pka of + is 10.78. n-butylamine exhibits reactions typical of other simple alkyl amines, i.e., alkylation, acylation, condensation with carbonyls. it forms complexes with metal ions, examples being cis- and trans-. uses this compound is used as an ingredient in the manufacture of pesticides (such as thiocarbazides), pharmaceuticals, and emulsifiers. it is also a precursor for the manufacture of n,n′-dibutylthiourea, a rubber vulcanization accelerator, and n-butylbenzenesulfonamide, a plasticizer of nylon. it is used in the synthesis of fengabine, the fungicide benomyl, and butamoxane, and the antidiabetic tolbutamide. butylamine is a precursor to the fungicide benomyl. safety the ld50 to rats through the oral exposure route is 366 mg/kg. in regards to occupational exposures to n-butylamine, the occupational safety and health administration and national institute for occupational safety and health have set occupational exposure limits at a ceiling of 5 ppm (15 mg/m3) for dermal exposure.