NOVEL PHOSPHINIC ACIDS AND SULPHUR-CONTAINING DERIVATIVES THEREOF, AND SYNTHESIS METHODS THEREOF Russian patent published in 2012 - IPC C07F9/30 C07F9/50 

FIELD: chemistry.

SUBSTANCE: invention relates to metal extractants of formula (I) and salts thereof, a method of producing compounds of formula from phosphines of formula , where R¹ and R² are different and denote -CH₂-CHR³R⁴ or -CR³(CH₂R⁵)R⁶, where R³ denotes methyl or ethyl, R⁴ and R⁶ denote an optionally substituted alkyl or heteroalkyl, R⁵ denotes H, an optionally substituted alkyl or heteroalkyl, or R⁵, R⁶ and an ethylene group with which they are bonded form an optionally substituted 5- or 6-member cycloalkyl or heterocycloalkyl ring, the substitutes being selected from alkyl, hydroxyl, halogen, alkoxyl, alkylthio group, carboxy group and acetyl group; X and Y independently denote O or S; except (2,4,4-trimethylpentyl)-(1-methylcyclohexyl)phosphinic acid or (2,4,4-trimethylpentyl)-(1-ethylcyclohexyl)phosphinic acid, or sulphur-containing derivatives thereof. The method involves obtaining a phosphine of formula (II) by reacting a phosphine of formula R¹PH₂ with an olefin of formula CH₂=CHR³R⁴ or HR⁵C=CR³R⁶ and then reacting the obtained phosphine with an oxidant or sulphur, or oxidation thereof to phosphine oxide followed by treatment with sulphur. Novel compounds of formula (I) are disclosed.

EFFECT: high efficiency of metal extractants and a novel efficient method of producing said extractants.

22 cl, 4 ex, 6 tbl