Synthesis of some thiophosphoric acid esters derived from 4-hydroxy-4'-nitrobiphenyl and their azo-analogues as new biocides

Extending our work on organophosphates of potential biological activated, we have now prepared certain new biphenyl analogues 3b-d of the known insecticide parathion [Ia] [O,O- diethyl-O-p-nitrophenyl phosphorothioate; E 605][5], and the phosphonothionate ester EPN [Ib] [O-ethyl O-p-nitrophenyl benzenephosphonothionate][5] for toxicological evaluation

Photochemistry of pesticides VI Photolysis of methyl 2benzimidazolecarbamate [carbendazim] in aqueous hydrochloric acid

Methyl 2-benzimidazolecarbamate [Carbendazim, MBC, 1] is an outstanding agent in plant protection. It possesses broad spectrum of biological activities which are devoid of serious injury to man and his environment. The photolysis of MBC, 1 has attracted the interest of a number of investigators

Synthesis of dialkyl [2-0 carbamoyl-3,4,5,6-tetrachlorophenyl] phosphates and dialkyl [4-0-carbamoyl-2,3, 5,5,6, tetrachlorophenyl] phosphates as new biocides

ORGANOPHOSPHATES have attracted much interest by virtue of the wide potentialities they possess. Thus they find application as insecticides[1] fungicides[2] and as herbicides [3]. Meanwhile, carbamates are well known for their broad biological activity[4-9]. This prompted us to prepare a number of new compounds, derived from tetrachlorobenzoquinones, encorporating both the phosphoric-, and carbamic acid-ester moieties to examine their biological activity. The phosphate adducts IIIa-c and IVa-c were prepared according to established procedures[10-11] by reacting dialkyl phosphites with tetrachloro-o-benzoquinone [I] and tetrachloro-p-benzoquinone [II] respectively, in the presence of triethylamine