Triphenyltin acetate fungicide

Nangniot and Martens [3] determined triphenyltin acetate fungicide in vegetable matter by a method based on the hanging drop mercury electrode. 

Triaryltin compounds such as triphenyltin hydroxide (TPTH, Fentin hydroxide, Du-Ter, I), or triphenyltin acetate (TPTOAC, Brestan, II) have been shown to be effective as protectant fungicides. These compounds have demonstrated other activity such as antifoulants, bactericides and algi-cides. Due to their low phytotoxicity they have been developed for plant protection. In several cases they have been reported to exhibit the unusual property of deterring insects from feeding. (2 )... 

Ascher et al. (1967) found that triphenyl tin hydroxide (fentin hydroxide, 34) and triphenyltin acetate (fentin acetate, 35), already known for their fungicidal and insect antifeedant effect, also show insect sterilising activity. They assumed that the sterilisation of male insects is brought about by a slow poisoning of the sperm. 

Ascher and co-workers (Ascher and Rones, 1964 Ascher and Nissim, 1964), as well as Murbach and Corbaz (1963) reported on the antifeedant activity of triphenyltins such as triphenyltin hydroxyde (2) and triphenyltin acetate (3) known as fungicides under the names Du-Ter and Brestan , respectively. Later these compounds were reported to show sterilising effect, too (see Section 1.9). 

Triorganotins, Rj Sn X, have in-vitro fungicidal and antibacterial properties which may be used for crop protection. Trialkyltin compounds are phytotoxic, but triphenyltins are well tolerated by plants and maintain a high biocidal activity. Triphenyltin acetate or hydroxide and tricyclohexyltin hydroxide are now registered in the United States and in many European and Asian countries as pesticides, but are also used as chemo-sterilants and antifeedants in insect control. 

---