QSAR STUDY CONCERNING PHOTOSYNTHESIS INHIBITION IN ALGAE AND PLANT CHLOROPLASTS BY 2-ALKYLTHIO-6-R-BENZOTHIAZOLES .1. 2-ALKYLTHIO-6-AMINOBENZOTHIAZOLES, NZOTHIAZOLYLAMINOMETHYL)-2-BENZOTHIAZOLINETHIONES, THIAZOLYLAMINOMETHYL)-6-BROMO-2-BENZOTHIAZOLINONES

Activity of 2-alkylthio-6-aminobenzothiazoles and their 6-N-substitute d derivatives enzothiazolylaminomethyl)-2-benzothiazolinethiones and h iazolylaminomethyl)-6-bromo-2-benzothiazolinones) concerning photosynt hesis inhibition in algae Chlorella vulgaris and in spinach chloroplas ts has been correlated with lipophilicity and dipole moments of the ef fecters using the Hansch method. Parameters of the Hansch equation wer e calculated by theoretical methods. The benzene and the thiazole ring s of 2-alkylthio-6-R-benzothiazoles are the electron-donor part of the investigated benzothiazole effecters. Antialgal activity of the compo unds of the series containing bromine showed relatively high efficienc y for all investigated derivatives with negligible differences.