| 摘要 |
Organo-silicon compounds of the general formula (CH3)3Si-[OSi(CH3)2]n-(CH2) m-S-CH2-COOM, wherein n is 0, 1 or 2, m is 2 or 3, and M represents lithium, sodium or potassium, are prepared by neutralizing the free acids with a base of the metal M. The compounds may also be prepared by using an ester of the acid referred to above which is hydrolyzable under the reaction conditions. The organo-silicon compounds may be employed as emulsifying agents for preparing aqueous emulsions of liquid organopolysiloxanes. In the examples, the following compounds are prepared: lithium, sodium and potassium 3-thia-7-trimethylsiloxy-7,7-dimethyl-7-silaheptanoate, and sodium 3-thia-6-sila-6,6-dimethylheptanoate and 3-thia-7 - sila - 7,7 - dimethyloctanoate. Specification 688,408 is referred to.ALSO:The invention comprises a process for the preparation of compounds of the general formula <FORM:0688407/IV (b)/1> wherein n is 0, 1 or 2, m is 2 or 3, and M represents lithium, sodium or potassium, by neutralizing with a base of the metal M an acid of the above general formula where M represents hydrogen, and the new compounds lithium, lithium, sodium and potassium 3-thia-6-sila-6,6 - dimethylheptanoate, 3 - thia - 7 - sila - 7,7 - dimethyl - octanoate, and 3 - thia - 7,7 - dimethyl - 7 - trimethylsiloxy - 7 - silaheptanoate. The above process may be modified by using an ester of the acid which is hydrolyzable under the reaction conditions. In the examples, lithium, sodium and potassium 3 - thia - 7 - trimethylsiloxy - 7,7 - dimethyl - 7 - silaheptanoate, and sodium 3-thia-6-sila-6,6-dimethylheptanoate and 3-thia-7-sila-7,7 dji, methyloctanoate are prepared. Specification 688,408 is referred to.ALSO:Emulsifying agents comprise organo-silicon compounds of the general formula: (CH3)3Si - [OSi(CH3)2]n p - (CH2)m - S - CH2 COOM, wherein n is 0, 1 or 2, m is 2 or 3 and M represents lithium, sodium or potassium.ALSO:Froth flotation reagents comprise organosilicon compounds of the general formula: (CH3)3Si - [OSi(CH3)2]n - (CH2)m - SCH2 COOM, wherein n is 0, 1 or 2, m is 2 or 3 and M represents lithium, sodium or potassium. The reagents may be used in the recovery of heavy metals, e.g. lead, copper, silver or gold.
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