![]() Dolge Company in Westport, Connecticut, published their synthesis in 1941. Robert Pokorny, an industrial chemist for the C.B. In the USA, a similar search for an acid with a longer half life, i.e., a metabolically and environmentally more stable compound, led to 2,4-dichlorophenoxyacetic acid (2,4-D) and 2,4,5-trichlorophenoxyacetic acid (2,4,5-T), both phenoxy herbicides and analogs of IAA. MCPA was discovered at about that time by his ICI group. In 1940, he published his finding that IAA killed broadleaf plants within a cereal field. William Templeman found that when indole-3-acetic acid (IAA), the naturally occurring auxin, was used at high concentrations, it could stop plant growth. The precise sequence of early 2,4-D discovery events and publications has been discussed. Hitchcock at the Boyce Thompson Institute, who were not the original inventors. The first scientific publication describing the 2,4-D structure and plant growth regulating activity was by Percy W. ![]() In December 1942, following a meeting at the Ministry of Agriculture the Rothamsted and ICI workers pooled resources and Nutman moved to Jealott's Hill to join the ICI effort. All four groups were subject to wartime secrecy laws and did not follow the usual procedures of publication and patent disclosure. Mitchell, and associates at the University of Chicago and the United States Department of Agriculture. Jones and associates at the American Chemical Paint Company and Ezra Kraus, John W. Nutman and associates at Rothamsted Research in the UK Franklin D. ![]() ![]() Templeman and associates at Imperial Chemical Industries (ICI) in the UK Philip S. The discovery of 2,4-D as well as the similar hormone herbicides 2,4,5-T, and MCPA occurred during World War II and was a case of multiple discovery by four groups working independently under wartime secrecy in the United Kingdom and the United States: William G. ![]()
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