Determination of p,p′-DDT in commercial samples

Wain, R. L.; Martin, Anne-Sophie

doi:10.1039/an9487300479

Cited by 3 publications

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“…A procedure and an equation for the calculation of the ,µ'-DDT content of commercial mixtures of the o,p-and p,p'isomers have been worked out (105), which depend on differences in the rates of dehydrohalogenation by alcoholic potassium hydroxide.…”

Section: Chloro Compoundsmentioning

confidence: 99%

Volumetric Analytical Methods for Organic Compounds

Smith¹,

Shriner²

1950

Anal. Chem.

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Section: Chloro Compoundsmentioning

confidence: 99%

Volumetric Analytical Methods for Organic Compounds

Smith¹,

Shriner²

1950

Anal. Chem.

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Über die Bestimmung vom Gesamt‐Chlorgehalt in DDT und DDT‐haltigen Präparaten

Vastagh¹,

Vastagh²,

Gervay³

1952

Archiv der Pharmazie

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form ausgeschiittelt und die Chloroformlosung, nach dem Waschen mit Wasser, auf dem Wasserbade i. Vak. abgedampft. Der hellgelbe Riiolrstand kristallisierte sofort aus Ather, Schmp. 93-94". Der Misrh.-Schmp. der Substanz mit dem nach la) dargestellten /?-Methyl-P-azetyl-phenylhydrazin zeigte keine Erniedrigung ; Ausb. 85% (ber. auf Aus-gangs+stanz) und 70% (ber. auf a -/?-Diazetyl-phenylhydrazin). /?-Athyl-a -,!?-diazetyl-phenylliydrazin I11 (R = C,H,): 2,3 g Natrium wurden in 50 ccm absol. Alkohol aufgeliist und rnit 19,2 g a -/?-Diazetyl-phenylhydrazin versetzt. Unter dauerndem Riihren wurden 15,4 g DiLthylsulfat in kleinen Portionen hinzugegeben, wobei die Temperatur auf 20" gehalten wurde. Nach 50 Stdn. war die Reaktion beendet. Der Inhalt des ReaktionsgefLBes wurde rnit 200 ccm Chloroform ausgeschiittelt. Nach dern Waschen mit Wasser wurde das Chloroform auf dcm Wasserbade i. Vak. abgedampft. Der braune olige Ruckstand wurde i. Valr. destilliert. Das farblose /?-Athyl-a . P-diazetylphenylhydrazin zeigte den Sdp.,, 184-188"; Ausb. 700/6. Leicht loslichin Wasser, Alkohol, Ather, schwer loslich in Petrolather. C12Hl,0,N, (220,2) Ber. C G0,54 H 7,34 N 12,72 Gef.: i) 60,35 i) 7,07 12,98

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Ralph Louis Wain, C.B.E. 29 May 1911 – 14 December 2000

Fowden¹

2002

Biogr. Mems Fell. R. Soc.

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Ralph Louis Wain died on 14 December 2000, at the age of 89 years. Just a few weeks before his death he had kept an audience enraptured by his enthusiastic presentation of chemical ideas during a two-hour lecture. Louis applied his chemical acumen to the solution of agricultural problems, believing the advancement of agricultural practice was highly dependent on developments in chemistry. He was interested particularly in how subtle changes in the structures of chemicals could influence their plant-growth-regulatory properties, and he discovered and actively promoted a group of selective herbicides, some of which are still used today in commercial practice. Many would regard him as Britain's most outstanding agricultural chemist of the twentieth century. He received numerous honours and prizes, but two gave him especial pleasure, perhaps because of their unusual citations. These were the Actonian Prize of the Royal Institution of Great Britain, awarded only every seventh year, for outstanding scientific work 'which illustrated the wisdom and beneficence of the Almighty' (previous winners had included Edison, Marconi, Marie Curie and Fleming), and the John Scott (USA) International Award for 'research for the benefit, welfare and happiness of mankind'. Wain was ever conscious of the need to protect and increase the harvests of food crops for the peoples of poorer, developing countries, and he was a major player in scientists' successes in increasing food crop production. Louis took every opportunity to convey his ideas and enthusiasm to fascinated audiences, whether they were schoolchildren or learned scientists, at home or abroad. He listed travel as one of his hobbies. Did this passion derive from the many invitations he received to lecture abroad? Whatever the answer, he gained great satisfaction from this role; and his audiences were most appreciative of his lucid lecturing style, and often the puckish humour with which his ideas were presented.

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Determination of p,p′-DDT in commercial samples

Cited by 3 publications

References 0 publications

Volumetric Analytical Methods for Organic Compounds

Volumetric Analytical Methods for Organic Compounds

Über die Bestimmung vom Gesamt‐Chlorgehalt in DDT und DDT‐haltigen Präparaten

Ralph Louis Wain, C.B.E. 29 May 1911 – 14 December 2000

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