[ 514-10-3] M 302.5, m 172-175 , [ ?] ²⁵ _D -116 (-106 )(c 1, EtOH), pK 5.27. Crystd dissolving 100g of acid in 95% EtOH (700mL), adding to H ₂O (600mL) and cooling. Filter, dry in a vacuum (over KOH or CaSO ₄) store in an O ₂-free atmospher. ? in EtOH nm(log ?): 2343(4.3), 241(4.4), 2505(4.2), 235(4.34) and 240(4.36). [ Org Synth 23 1 1952; J Am Chem Soc 35 3736 1949; Monatsh Chem 116 1345 1985.]

S-Absicic acid [ 21293-29-8] 264.3, m 160-161 , 161-163 (sublimation,), [ ?] ₂₈₇ + 24,000 , [ ?] ₂₄₅ -69,000 (c-150 ?g/ML in acidified MeOH or EtOH), pK _Est 3.9. Crystd from CCl ₄-pet.ether, EtOH + hexane and sublimes at 120 .

Acenaphthalene [ 208-96-8] M 152.2, m 92-93 . Dissolved in warm redistd MeOH, Filtered through a sintered glass Funnel and cooled to -78 to ppte the material as yellow plates [Dainton, Ivin and Walmsley Trans Faraday Soc 56 1784 1960]. Alternatively can be sublined in vacuo.

Acenaphthaquinone [ 82-86-0] M 182.2 m 260-261 . Extracted with, then recrystd twice from ^*C ₆H ₆ [LeFevre, Sundaram and Sundaram J Chem Soc 974 1963.]

Acenaphthene [ 83-32]-9] M 154.2, m 94.0 . Crystd from EtOH. Purified by chromatography from CCl ₄ on alumina with