| 摘要 |
<p>1304722 Phosphorus-containing pyridine derivatives AGRIPAT SA 31 March 1970 [28 March 1969] 15107/70 Headings C2C and C2P [Also in Division A5] The invention comprises compounds of the formula wherein R 1 and R 2 are C 1 -C 5 alkyl radicals which may be substituted by C 1 -C 4 alkoxy, R 3 is halogen or C 1 -C 5 alkyl, X is O or S and n is an integer from 0 to 2. They may be obtained by reacting, in any order, and in the presence of an inorganic or organic base, a compound of the formula with a compound of the formula wherein Hal is Cl or Br and with hydrogen sulphide. The intermediate compounds formed have the formulµ the compounds being obtained by using a reactant of Formula II and H 2 S respectively in the first step. The products I have pesticidal properties. O - [5 - cyano - pyridyl (2)] - .O,O - diethyl phosphorothioate is obtained by reacting 2- hydroxy - 5 - cyano - pyridine with (C 2 H 5 O) 2 P(S)Cl in methyl ethyl ketone in the presence of potassium carbonate. 2 - Hydroxy - 5 - thiocarbamoyl - pyridine is obtained by introducing H 2 S gas into a solution of 2 - hydroxy - 5 - cyano - pyridine in a mixture of pyridine and triethylamine.</p> |
