Claims
- 1. A compound of the formula: ##STR6## wherein: R.sub.1 and R.sub.2 are independently selected from the group consisting of lower alkyl (1-5 carbon atoms) with the proviso that at least one of the R.sub.1 and R.sub.2 groups has a substituent selected from the group consisting of --SO.sub.3 H, --OSO.sub.3 H, --PO.sub.3 H.sub.2, --OPO.sub.3 H.sub.2, --COOH and --NHSO.sub.3 H;
- R.sub.3 and R.sub.4 are independently selected from the group consisting of alkyl (5-15 carbon atoms); and
- R.sub.5 and R.sub.6 are independently selected from the group consisting of hydrogen, hydroxyl, and lower alkoxyl (1-5 carbon atoms).
- 2. The compound of claim 1 wherein the substituent of R.sub.1 and R.sub.2 is --SO.sub.3 H.
- 3. The compound of claim 1 wherein R.sub.1 is lower alkyl (1-5 carbon atoms); R.sub.3 and R.sub.4 are alkyl (5-15 carbon atoms); and R.sub.2 is --(CH.sub.2).sub.n SO.sub.3 H, where n is 2-5.
- 4. The compound of claim 3 wherein R.sub.1 is ethyl, R.sub.3 and R.sub.4 are heptyl and n is 3.
Parent Case Info
This is a continuation-in-part of copending application U.S. Ser. No. 645,458 filed Aug. 28, 1984, now U.S. Pat. No. 4,748,129, incorporated herein by reference.
US Referenced Citations (5)
Non-Patent Literature Citations (4)
Entry |
Liebesking et al., "Journal Org. Chem.", 53:2482-88, (1988). |
Springer et al., "Ang. Chem. Intl. Edit.", vol. 7:530, (1968). |
Kim et al., "J. Chem. Soc., Chem. Commun.", :1201, (1987). |
Sprenger et al., "Angew. Chem. Intl. Edit.", vol. 5:894, (1966). |
Continuation in Parts (1)
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Number |
Date |
Country |
Parent |
645458 |
Aug 1984 |
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