Properties: Needles from methylene chloride at -40°. Very thermolabile. Complete retention of activity is possible only by storage at -40° or lower. mp 7.5° (deflagrates). [a]D25 -130° (c = 0.4 in ethanol). uv max (ether): 267, 281 nm (e 61,000, 67,000). Sol in alcohol, ether, amyl acetate, methylene chloride. Forms a water-sol sodium salt. The acid itself is sparingly sol in water and is relatively stable in extremely dil aq solns (approx 0.005 mg/ml), half-life inversely related to concn. Undergoes an unusual rearrangement in normal aq KOH at 27°, involving an allene to acetylene isomerization accompanied by migration of the existing acetylenic bonds. The rearranged acid,
isomycomycin, has been assigned the structure
3,5-tridecadiene-7,9,11-triynoic acid, CH3-C℃-C℃-C℃-CH=CHCH=CHCH2COOH.
Melting point: mp 7.5° (deflagrates)
Optical Rotation: [a]D25 -130° (c = 0.4 in ethanol)
Absorption maximum: uv max (ether): 267, 281 nm (e 61,000, 67,000)
产品链接: 544-51-4››