Process for the preparation of alkylthioalkanoate salts
First Claim
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1. A process for the preparation of a compound corresponding to the formula:
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space="preserve" listing-type="equation">R.sup.1 --S--(CH.sub.2).sub.n --CH(R.sup.2)--C(O)--OMwhere R1 comprises a lower alkyl group, M is alkali metal, n is an integer between 2 and 4, inclusive and R2 is selected from the group consisting of hydrogen, hydroxyl, amino,
space="preserve" listing-type="equation">--OR.sup.3, and
space="preserve" listing-type="equation">--NH--R.sup.4where R3 is selected from the group consisting of alkyl and aryl, and R4 is selected from the group consisting of alkyl, aryl, and acyl, the process comprising;
reacting a lower alkyl mercaptan corresponding to the formula;
space="preserve" listing-type="equation">R.sup.1 --SH, where R1 is as defined above, with an alkali metal phenate to produce an alkali metal mercaptide corresponding to the formula;
space="preserve" listing-type="equation">R.sup.1 --S--M where R1 and M are as defined above; and
reacting said alkali metal mercaptide, in the presence of an aprotic polar organic solvent, with a lactone corresponding to the formula ##STR4## where R2 and n are as defined above.
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Abstract
A process for the preparation of alkylthioalkanoate salts by reaction of an alkali metal alkylmercaptide with a lactone in the presence of an aprotic polar organic solvent. Preferably, the alkali metal mercaptide is prepared by reaction of an alkylmercaptan and an alkali metal phenate.
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Citations
26 Claims
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1. A process for the preparation of a compound corresponding to the formula:
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space="preserve" listing-type="equation">R.sup.1 --S--(CH.sub.2).sub.n --CH(R.sup.2)--C(O)--OMwhere R1 comprises a lower alkyl group, M is alkali metal, n is an integer between 2 and 4, inclusive and R2 is selected from the group consisting of hydrogen, hydroxyl, amino,
space="preserve" listing-type="equation">--OR.sup.3, and
space="preserve" listing-type="equation">--NH--R.sup.4where R3 is selected from the group consisting of alkyl and aryl, and R4 is selected from the group consisting of alkyl, aryl, and acyl, the process comprising; reacting a lower alkyl mercaptan corresponding to the formula;
space="preserve" listing-type="equation">R.sup.1 --SH,where R1 is as defined above, with an alkali metal phenate to produce an alkali metal mercaptide corresponding to the formula;
space="preserve" listing-type="equation">R.sup.1 --S--Mwhere R1 and M are as defined above; and
reacting said alkali metal mercaptide, in the presence of an aprotic polar organic solvent, with a lactone corresponding to the formula ##STR4## where R2 and n are as defined above. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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- 8. A process for the preparation of an alkythioalkanoate compound corresponding to the formula
- space="preserve" listing-type="equation">R.sup.1 --S--(CH.sub.2).sub.n --CH(R.sup.2)--C(O)--OM
where R1 comprises a lower alkyl group, M is alkali metal, n is an integer between 2 and 4, inclusive, and R2 is selected from the group consisting of hydrogen, hydroxyl, amino,
space="preserve" listing-type="equation">--OR.sup.3 and
space="preserve" listing-type="equation">--NH--R.sup.4where R3 is selected from the group consisting of alkyl and aryl, and R4 is selected from the group consisting of alkyl, aryl, and acyl, the process comprising admixing and reacting, in the presence of an aprotic polar organic solvent, a lower alkyl mercaptan corresponding to the formula;
space="preserve" listing-type="equation">R.sup.1 --S--Hwhere R1 is as defined above, an alkali metal phenate, and a lactone corresponding to the formula;
##STR5## where R2 is as defined above; and
maintaining the resulting mixture at a temperature of at least 80°
C. for a time sufficient to form said alkylthioalkanoate compound.- View Dependent Claims (9, 10, 11, 12, 13)
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14. A process for the preparation of a compound corresponding to the formula:
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space="preserve" listing-type="equation">R.sup.1 --S--(CH.sub.2).sub.n --CH(R.sup.2)--C(O)--OMwhere R1 comprises a lower alkyl group, M is alkali metal, n is an integer between 2 and 4 inclusive, and R2 is selected from the group consisting of hydrogen, hydroxyl, amino,
space="preserve" listing-type="equation">--OR.sup.3 and
space="preserve" listing-type="equation">--NH--R.sup.4where R3 is selected from the group consisting of alkyl and aryl, and R4 is selected from the group consisting of alkyl, aryl, and acyl, the process comprising the steps of; reacting a substituted or unsubstituted phenol with an alkali metal hydroxide in a crude base reaction system comprising a solvent selected from the group consisting of pyridine and aprotic ring substituted pyridines that form low boiling azeotropes with water; removing water from said crude base reaction system by azeotropic distillation, thereby forming a substantially anhydrous base reagent mixture containing an alkali metal phenate; reacting a lower alkyl mercaptan corresponding to the formula;
space="preserve" listing-type="equation">R.sup.1 --S--Hwhere R1 is defined above, with said alkali metal phenate, thereby producing an alkali metal mercaptide corresponding to the formula;
space="preserve" listing-type="equation">R.sup.1 --S--Mwhere R1 and M are as defined above; and
reacting said alkali metal mercaptide, in the presence of an aprotic polar organic solvent, with a lactone corresponding to the formula;
##STR6## where R2 and n are as defined above. - View Dependent Claims (15, 16, 17, 18)
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19. A process for the preparation of an alkylthioalkanoate compound corresponding to the formula:
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space="preserve" listing-type="equation">R.sup.1 --S--(CH.sub.2).sub.n --CH(R.sup.2)--C(O)--OMwhere R1 comprises a lower alkyl group, M is alkali metal, n is an integer between 2 and 4, inclusive, and R2 is selected from the group consisting of hydrogen, hydroxyl, amino,
space="preserve" listing-type="equation">--OR.sup.3 and
space="preserve" listing-type="equation">--NH--R.sup.4where R3 is selected from the group consisting of alkyl and aryl, and R4 is selected, from the group consisting of alkyl, aryl, and acyl, the process comprising the steps of; reacting a substituted or unsubstituted phenol with an alkali metal hydroxide in a crude base reaction system comprising a solvent selected from the group consisting of pyridine and aprotic ring substituted pyridines that form low boiling azeotropes with water; removing water from said crude base reaction system by azeotropic distillation, thereby forming a substantially anhydrous base reagent mixture; preparing a final reaction mixture by admixing with said anhydrous base reagent mixture a lower alkylmercaptan corresponding to the formula;
space="preserve" listing-type="equation">R.sup.1 --S--Hwhere R1 is as defined above, and a lactone corresponding to the formula;
##STR7## where R2 and n are as defined above; and
maintaining the final reaction mixture at a temperature of at least 80°
C. for a time sufficient to form said alkylthioalkanoate compound. - View Dependent Claims (20, 21, 22)
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23. A process for the preparation of a compound corresponding to the formula:
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space="preserve" listing-type="equation">CH.sub.3 --S--(CH.sub.2).sub.2 --CH(R.sup.2)--C(O)--OMwhere M is alkali metal and R2 is selected from the group consisting of hydrogen, hydroxyl, amino,
space="preserve" listing-type="equation">--OR.sup.3 and
space="preserve" listing-type="equation">--N--R.sup.4where R3 is selected from the group consisting of alkyl and aryl, and R4 is selected from the group consisting of alkyl, aryl, and acyl, the process comprising reacting methylmercaptan with an alkali metal phenate to produce a alkali metal methylmercaptide corresponding to the forumla;
space="preserve" listing-type="equation">CH.sub.3 --S--M,where M is as defined above; and reacting said alkali metal methylmercaptide, in the presence of an aprotic polar organic solvent, with a lactone corresponding to the formula;
##STR8## where R2 is as defined above.
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24. A process for the preparation of a methylthiobutyrate compound corresponding to the formula:
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space="preserve" listing-type="equation">CH.sub.3 --S--(CH.sub.2).sub.2 --CH(R.sup.2)--C(O)--OMwhere M is alkali metal and R2 is selected from the group consisting of hydrogen, hydroxyl, amino,
space="preserve" listing-type="equation">--OR.sup.3 and
space="preserve" listing-type="equation">--NH--R.sup.4where R3 is selected from the group consisting of alkyl and aryl, and R4 is selected from the group consisting of alkyl, aryl, and acyl, the process comprising admixing and reacting, in the presence of an aprotic polar organic solvent, methylmercaptan, an alkali metal phenate and a lactone corresponding to the formula;
##STR9## where R2 is as defined above; and
maintaining the resulting mixture at a temperature of at least 80°
C. for a time sufficient to form said methylthiobutyrate compound.
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25. A process for the preparation of a compound corresponding to the formula:
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space="preserve" listing-type="equation">CH.sub.3 --S--(CH.sub.2).sub.2 --CH(R.sup.2)--C(O)--OMwhere M is alkali metal and R2 is selected from the group consisting of hydrogen, hydroxyl, amino,
space="preserve" listing-type="equation">--OR.sub.3 and
space="preserve" listing-type="equation">--NH--R.sup.4where R3 is selected from the group consisting of alkyl and aryl, and R4 is selected from the group consisting of alkyl, aryl, and acyl, the process comprising the steps of; reacting a substituted or unsubstituted phenol with an alkali metal hydroxide in a crude base reaction system comprising a solvent selected from the group consisting of pyridine and aprotic ring substituted pyridines that form low boiling azeotropes with water; removing water from said crude base reaction system by azeotropic distillation, thereby forming a substantially anhydrous base reagent mixture containing an alkali metal phenate; reacting methylmercaptan with said alkali metal phenate, thereby producing an alkali metal mercaptide corresponding to the formula;
space="preserve" listing-type="equation">CH.sub.3 --S--Mwhere M is as defined above; and reacting said alkali metal mercaptide, in the presence of an aprotic polar organic solvent, with a lactone corresponding to the formula;
##STR10## where R2 is as defined above.
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26. A process for the preparation of a methylthiobutyrate compound corresponding to the formula:
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space="preserve" listing-type="equation">CH.sub.3 --S--(CH.sub.2).sub.2 --CH(R.sup.2)--C(O)--OMwhere M is alkali metal and R2 is selected from the group consisting of hydrogen, hydroxyl, amino,
space="preserve" listing-type="equation">--OR.sup.3 and
space="preserve" listing-type="equation">--NH--R.sup.4where R3 is selected from the group consisting of alkyl and aryl, and R4 is selected from the group consisting of alky, aryl, and acyl, the process comprising the steps of; reacting a substituted or unsubstituted phenol with an alkali metal hydroxide in a crude base reaction system comprising a solvent selected from the group consisting of pyridine and aprotic ring substituted pyridines that form low boiling azeotropes with water; removing water from said crude base reaction system by azeotropic distillation, thereby forming a substantially anhydrous base reagent mixture; preparing a final reaction mixture by admixing with said anhydrous base reagent mixture methylmercaptan and a lactone corresponding to the formula;
##STR11## where R2 is as defined above; and
maintaining the final reaction mixture at a temperature of at least about 80°
C. for a time sufficient to form said methylthiobutyrate compound.
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Specification