[442-51-3] M 212.3, m 261 (dec), pK ²⁰ 7.61. Crystd from MeOH.

Harmine hydrochloride (hydrate) [343-27-1] M 248.7, m 280 (dec). Crystd from water.

Hecogenine acetate [915-35-5] M 472.7, m 265-268 , [ ?] ²³ _D -4.5 (c 1, CHCl ₃). Crystd from MeOH.

Heptadecanoic acid (margaric) [506-12-7] M 270.5, m 60-61 , b 227 /100mm, pK _Est 4.9. Crystd from MeOH or pet ether.

1-Heptadecanol [1454-85-9] M 256.5, m 54 . Crystd from acetone.

Heptafluoro-2-iodopropane [677-69-0] M 295.9, b 41 . Purified by gas chromatography on a triacetin (glyceryl triacetate) column, followed by bulb-to-bulb distn at low temperature. Stored over Cu powder to stabilise it.

n-Heptaldehyde [111-71-7] M 114.2, b 40.5 /12mm, 152.8 /760mm, d 0.819, n ²⁵ 1.4130. Dried with CaSO ₄ or Na ₂SO ₄ and fractionally distd under reduced pressure. More extensive purification by pptn as the bisulfite compound (formed by adding the aldehyde to saturated aqueous NaHSO ₃) which was filtered off and recrystd from hot H ₂O. The crystals, after being filtered and washed well with H ₂O, were hydrolysed by adding 700mL of aqueous Na ₂CO ₃ (12.5% w/w of anhydrous Na ₂CO ₃) per 100g of aldehyde. The aldehyde was then steam distd, separated, dried with CuSO ₄ and distd under reduced pressure in a slow stream of nitrogen. [McNesby and Davis J Am Chem Soc 76 2148 1954].

n