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(11)    Patent No :    AP 2496    (73) Applicant(s)       
(21)    Application No :    AP/P/2008/004681    CYTEC CANADA INC, 9061 Garner Road, Niagara Falls,       
            Ontario, L2E 6T4,       
                   
(22)    Filing Date :    12.06.2007    Canada       
(24)    Date of Grant &    19.10.2012           
                   
(45)    Publication :

(30)    Priority Data            (72) Inventors   
    (33) Country    (31) Number    (32) Date    ZHOU Yuehui, Canada   
    CA    2,550,557    14.06.2006    DYCK Jeffrey Charles Henry, Canada   
                   
                JAKOVLJEVIC Boban, Canada   
                et al       
                (74) Representative   
(84)    Designated State           
                   
    ZM   ZW            HONEY & BLANCKENBERG   
                   
(51)    International    Classification    C07F 9/30 (20006.01)    C07F 9/50 (2006.01)   

(54)    Title

Novel phosphinic acids and their sulfur derivatives and methods for their preparation

(57)    Abstract

The present invention provides phosphinic acids and their sulfur derivatives, in

accordance with the following formula (I): wherein R1 and R2 are different and each of R1 and R2 is independently selected from an organic radical that branches at the alpha carbon and an organic radical that branches at the beta carbon, and each of X and Y is independently O or S, and wherein said compound is a liquid at room temperature. Compounds of formula (I) find utility for example as metal extractants. Also provided are methods for

(56)    Documents Cited :    US 2584112    US 4348367    US 4555 368    US 437480    US 5028403    EP 0236542

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