Thidiazuron

from Wikipedia, the free encyclopedia
Structural formula
Structural formula of thidiazuron
General
Surname Thidiazuron
other names
  • N- phenyl- N '-1,2,3-thiadiazol-5-ylurea
  • Dropp
  • Defolit
Molecular formula C 9 H 8 N 4 OS
Brief description

colorless crystals

External identifiers / databases
CAS number 51707-55-2
EC number 257-356-7
ECHA InfoCard 100.052.125
PubChem 40087
Wikidata Q1968056
properties
Molar mass 220.25 g mol −1
Physical state

firmly

density

1.51 g cm −3

Melting point

211.5 ° C

solubility

practically insoluble in water (20 mg l −1 at 20 ° C)

safety instructions
GHS labeling of hazardous substances
07 - Warning 09 - Dangerous for the environment

Caution

H and P phrases H: 315-319-332-335-410
P: 273-305 + 351 + 338-391-501
Toxicological data
As far as possible and customary, SI units are used. Unless otherwise noted, the data given apply to standard conditions .

Thidiazuron is a chemical compound from the group of phenylureas .

Extraction and presentation

Thidiazuron can be obtained by reacting 3-amino-1,2-thiadiazole and phenyl isocyanate .

use

Thidiazuron has been used as a growth regulator with a cytokinin- like effect and as a defoliant in cotton cultivation since the 1980s .

Admission

The use of the active ingredient thidiazuron in plant protection products is not permitted in the European Union or Switzerland. However, it is known that the active ingredient manufactured by Bayer is sold on the Brazilian and South African markets.

Individual evidence

  1. a b c d e f Entry on thidiazuron in the Pesticide Properties DataBase (PPDB) of the University of Hertfordshire , accessed on March 24, 2014.
  2. a b Data sheet Thidiazuron from Sigma-Aldrich , accessed on May 20, 2017 ( PDF ).
  3. Thomas A. Unger: Pesticide Synthesis Handbook . William Andrew, 1996, ISBN 0-8155-1853-6 , pp. 258 ( limited preview in Google Book search).
  4. Patent US4294605 : Agents for the defoliation of plants. Applied on November 21, 1979 , published October 13, 1981 , Applicant: Schering. And patent DE2214623.
  5. MC Mok, DWS Mok, DJ Armstrong, K. Shudo, Y. Isogai, T. Okamoto: Cytokinin activity of N-phenyl-N′-1,2,3-thiadiazol-5-ylurea (thidiazuron) . In: Phytochemistry . tape 21 , no. January 7 , 1982, pp. 1509-1511 , doi : 10.1016 / S0031-9422 (82) 85007-3 ( PDF ).
  6. General Directorate Health and Food Safety of the European Commission: Entry on thidiazuron in the EU pesticide database; Entry in the national registers of plant protection products in Switzerland , Austria and Germany ; accessed on March 26, 2016.
  7. Decision of the Commission of April 4, 2008 (PDF) on the non-inclusion of azocyclotine, cyhexatin and thidiazuron in Annex I of Council Directive 91/414 / EEC.
  8. Jump up ↑ Benjamin Luig, Fran Paula de Castro and Alan Tygel (both Campanha Permanente Contra os Agrotóxicos e Pela Vida), Lena Luig (INKOTA network), Simphiwe Dada (Khanyisa), Sarah Schneider (MISEREOR) and Jan Urhahn (Rosa-Luxemburg- Foundation): Dangerous pesticides. (PDF; 2.4 MB) from Bayer and BASF - a global business with double standards. Rosa Luxemburg Foundation , INKOTA network , Episcopal Aid Organization Misereor u. a., April 2020, accessed on April 25, 2020 .