Synthesis, Structure, and Reactivity of closo-2,3,4,5,6,7,8,9,10,11-Decahydroxy-1,12-bis(sulfonic acid)-1,12-dicarbadodecaborane(12)
| Autor: | M. F. Hawthorne, Carolyn B. Knobler, Axel Herzog |
|---|---|
| Rok vydání: | 2001 |
| Předmět: |
chemistry.chemical_classification
Aqueous solution General Chemistry Sulfinic acid Sulfonic acid Biochemistry Medicinal chemistry Catalysis chemistry.chemical_compound Hydrolysis Colloid and Surface Chemistry Sulfonate chemistry Yield (chemistry) Organic chemistry Reactivity (chemistry) Derivative (chemistry) |
| Zdroj: | Journal of the American Chemical Society. 123:12791-12797 |
| ISSN: | 1520-5126 0002-7863 |
| DOI: | 10.1021/ja011917g |
| Popis: | The reaction of closo-1,12-bis(lithio)-1,12-dicarbadodecaborane(12) (1,12-bis(lithio)-p-carborane) with SO(2) formed closo-1,12-bis(lithiosulfinato)-p-carborane (10) in nearly quantitative yield. The latter was converted to closo-1,12-bis(sulfinic acid)-p-carborane (13) via H(+)-exchange. The corresponding 1,12-bis(sulfonic acid) derivative of p-carborane (12) was obtained in high yield by treating 10 with SO(2)Cl(2) and subsequent AlCl(3) mediated hydrolysis of the closo-1,12-bis(chlorosulfonyl)-p-carborane intermediate. The exhaustive oxidation of 12 in hot aqueous H(2)O(2) (30%) afforded B-decahydroxy-1,12-bis(sulfonic acid)-p-carborane (15) in 40% yield. As a byproduct, closo-B-decahydroxy-1-sulfonic acid-p-carborane (14) was formed. Both 14 and 15 were also obtained from the hydroxylation of 10 and 13. Compound 14 was obtained directly in 88% yield by heating 1-sulfinic acid-p-carborane (17) in H(2)O(2) (30%). Compound 17 was synthesized from diphenylmethylsilyl-protected p-carborane by using the method employed in the synthesis of 13. The X-ray structures of 15, its disodium salt, and its dipotassium salt are presented and discussed. Exhaustive methylation of 15 with methyl triflate furnishes closo-B-decamethoxy-1,12-bis(methyl sulfonate)-p-carborane (20). The characterization of closomer 20 also includes its crystal structure determination. |
| Databáze: | OpenAIRE |
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