1,3-butanediol 1,3-butanediol 1,3-butanediol is an organic compound with the formula ch3ch(oh)ch2ch2oh. with two alcohol functional groups, the molecule is classified as a diol. the compound is also chiral, but most studies do not distinguish the enantiomers. the compound is a colorless, bittersweet, water-soluble liquid. it is one of four common structural isomers of butanediol. it is used in flavoring. 1,3-butanediol ball and stick model of 1,3-butanediol (s) spacefill model of 1,3-butanediol (s) names preferred iupac name butane-1,3-diol other names 1,3-butylene glycol, butane-1,3-diol, or 1,3-dihydroxybutane identifiers cas number 107-88-0 y6290-03-5 (r) y24621-61-2 (s) y 3d model (jsmol) interactive image beilstein reference 1731276 1718944 (r) 1718943 (s) chebi chebi:52683 n chembl chembl1231503 n chemspider 7608 y553103 (r) y394191 (s) y drugbank db02202 n echa infocard 100.003.209 ec number 203-529-7 e number e1502 (additional chemicals) gmelin reference 2409 2493173 (r) 1994384 (s) kegg d10695 n mesh 1,3-butylene+glycol pubchem cid 7896637497 (r)446973 (s) rtecs number ek0440000 unii 3xus85k0ra y comptox dashboard (epa) dtxsid8026773 inchi inchi=1s/c4h10o2/c1-4(6)2-3-5/h4-6h,2-3h2,1h3 nkey: pupzlcdoiymwbv-uhfffaoysa-n n smiles cc(o)cco properties chemical formula c4h10o2 molar mass 90.122 g·mol−1 appearance colourless liquid density 1.0053 g cm−3 melting point −50 °c (−58 °f; 223 k) boiling point 204 to 210 °c; 399 to 410 °f; 477 to 483 k solubility in water 1 kg dm−3 log p −0.74 vapor pressure 8 pa (at 20 °c) refractive index (nd) 1.44 thermochemistry std molarentropy (s⦵298) 227.2 j k−1 mol−1 std enthalpy offormation (δfh⦵298) −501 kj mol−1 std enthalpy ofcombustion (δch⦵298) −2.5022 mj mol−1 hazards ghs labelling: pictograms signal word warning hazard statements h319, h413 precautionary statements p305+p351+p338 nfpa 704 (fire diamond) 1 1 0 flash point 108 °c (226 °f; 381 k) autoignitiontemperature 394 °c (741 °f; 667 k) related compounds related butanediol 1,2-butanediol 1,4-butanediol 2,3-butanediol related compounds 2-methylpentane 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 production and uses hydrogenation of 3-hydroxybutanal gives 1,3-butanediol: ch3ch(oh)ch2cho + h2 → ch3ch(oh)ch2ch2oh dehydration of 1,3-butanediol gives 1,3-butadiene: ch3ch(oh)ch2ch2oh → ch2=ch-ch=ch2 + 2 h2o occurrence 1,3-butanediol is used as a hypoglycaemic agent. 1,3-butanediol has been detected in green bell peppers, orange bell peppers, pepper (capsicum annuum), red bell peppers, and yellow bell peppers. 1,3 butanediol, also referred to as 1,3-butylene glycol, maintains fda gras status as a flavor molecule.