Patent ID: 7923558

Claim:
Process for obtaining pure tetrahydrocannabinol from reaction mixtures containing tetrahydrocannabinol compounds or from crude product containing tetrahydrocannabinol compounds, characterized in that the tetrahydrocannabinol compound in the reaction mixture or in the crude product is converted to a crystallizable derivative of formulae (III) and (IIIA): in which R 1 is hydrogen, chlorine or (C 1-10 )-alkyl; X is —O— (oxygen) or —NH—; and R 2 is an optionally substituted aliphatic or aromatic radical which optionally carries a substituent capable of salt formation; or a heterocyclic radical which optionally is itself capable of salt formation and/or optionally carries a substituent capable of salt formation; or a radical of an aliphatic or aromatic polybasic acid; whereby said derivative is crystallized out and isolated and the pure tetrahydrocannabinol compound is then obtained from the crystallized derivative.