Claims
- 1. A compound of the formula ##STR7##
- wherein each of R.sub.1 and R.sub.1 ' is lower alkyl, phenyl, phenyl substituted by one or more lower alkyl, fluorine, chlorine, bromine, nitro and lower alkoxy or benzyl, each of R.sub.2, R.sub.3 and R.sub.4 is hydrogen or lower alkyl and Z is the residue of a dienophile moiety selected from the group consisting of maleic anhydride and citraconic anhydride.
- 2. The compound of claim 1 wherein R.sub.1 is methyl or ethyl.
- 3. The compound of claim 1 wherein each of R.sub.2, R.sub.3 and R.sub.4 is hydrogen.
- 4. The compound of claim 3 which is 4(O,O-dimethylphosphoryloxy)-cyclohex-4-en-cis-1,2-carboxylic anhydride.
Parent Case Info
This is a division of application Ser. No. 618,853 filed Oct. 2, 1975, now U.S. Pat. No. 4,025,584, which in turn is a division of application Ser. No. 497,598, filed Aug. 15, 1974, now U.S. Pat. No. 3,933,948, granted Jan. 20, 1976.
US Referenced Citations (2)
Number |
Name |
Date |
Kind |
3346597 |
De Acetis |
Oct 1967 |
|
4025584 |
Burri et al. |
May 1977 |
|
Non-Patent Literature Citations (1)
Entry |
Houben-Weyl, Methoden der Organischen Chemie, vol. 12/2 (1964), p. 334. |
Divisions (2)
|
Number |
Date |
Country |
Parent |
618853 |
Oct 1975 |
|
Parent |
497598 |
Aug 1974 |
|