Claims
- 1. A compound of the formula ##STR16## wherein: R.sub.2 is selected from the group consisting of hydrogen and lower alkyl;
- R.sub.5 and R.sub.6 are selected from the group consisting of hydrogen and lower alkyl and may be the same or different; R.sub.8 is selected from the group consisting of hydrogen and lower alkyl;
- R.sub.7 is hydrogen, lower alkyl or ##STR17## R.sub.9 is CH.sub.2 OH R.sub.10 is hydrogen; consisting of hydrogen, lower alkyl, phenyl and hydroxyl substituted loweralkyl and may be the same or different;
- when R.sub.7 contains a hydroxyl group in the .alpha. or .beta. position, R.sub.7 may form the hemiketal ring closure at the carbon 3 of the butyrolactone with protonation of the carbonyl group on the same carbon atom; and
- X is selected from the group consisting of O, S, and NH.
- 2. The compound of claim 1 having the structure formula ##STR18## wherein: R.sub.2 is --CH.sub.3 ;
- R.sub.5 and R.sub.6 are each hydrogen;
- X is O;
- R.sub.8 is as defined in claim 1.
- 3. A crystalline molecular complex, comprising the compound of claim 2 and succinic anhydride in a molar ratio of 2:1.
- 4. A crystalline molecular complex, comprising the compound of claim 2 and succinimide in a molar ratio of 2:1.
- 5. A crystalline molecular complex, comprising the compound of claim 2 and N-methyl succinimide in molar ratio of 2:1.
Parent Case Info
This application is a continuation-in-part of pending application Ser. No. 450,493, filed Dec. 16, 1982, now abandoned, which is in turn a continuation of application Ser. No. 192,806, filed Oct. 1, 1980, now abandoned, which is in turn a divisional of application Ser. No. 093,594, filed Nov. 13, 1979, now U.S. Pat. No. 4,287,205, which is in turn a continuation of Ser. No. 917,327, filed June 20, 1978, now abandoned.
US Referenced Citations (3)
Number |
Name |
Date |
Kind |
3452002 |
Brasch |
Jun 1969 |
|
3499007 |
von Brachel et al. |
Mar 1970 |
|
4326072 |
Kruse et al. |
Apr 1982 |
|
Foreign Referenced Citations (1)
Number |
Date |
Country |
520226 |
Jan 1956 |
CAX |
Divisions (1)
|
Number |
Date |
Country |
Parent |
93594 |
Nov 1979 |
|
Continuations (2)
|
Number |
Date |
Country |
Parent |
192806 |
Oct 1980 |
|
Parent |
917327 |
Jun 1978 |
|
Continuation in Parts (1)
|
Number |
Date |
Country |
Parent |
450493 |
Dec 1982 |
|