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3-Acyl-5-(1-aminoalkylidene)-4-hydroxy-2 H- pyran-2,6(3 H)-dione derivatives carrying lipophilic amino groups were found to be highly potent inhibitors of photosynthetic electron transport, and both the acyl and the aminoalkylidene groups on the pyran ring appeared to be indispensable for high activity. The structural features needed for activity in the 3-acyl-5- (l-am inoalkylidene)-4-hydroxy -2 H-pyran -2 ,6 (3 H)-dione derivatives were very similar to those for 3 -(l-aminoalkylidene)-2H-pyran-2,4(3H)-diones, except for the acyl group in the former compounds. Thermoluminescence measurements indicated that the 3-acyl-5- (1-aminoalkylidene)-4 -hydroxy -2H-pyran -2 ,6 (3 H )-dione derivatives bind to the D 1 protein in a manner similar to that of DCMU .

Photosystem II Inhibition by 3-Acyl-5-(l-aminoalkylidene)-4-hydroxy- 2H -pyran-2,6(3H)-dione Derivatives