Process for preparing phosphorothioates and phenylphosphonothioates
First Claim
1. In the process of preparing a compound corresponding to the formula ##STR35## wherein:
- R1 and R2 are each independently lower alkyl; and
R is ##STR36## wherein;
n is 0, 1, 2 or 3; and
X is nitro, cyano, halo, lower alkyl, lower alkoxy, lower alkylthio or lower alkylsulfinyl, with the proviso that R does not bear more than one nitro group, lower alkylthio group or lower alkyl-sulfinyl group;
by reacting in an inert liquid reaction medium under neutral or alkaline conditions (a) a compound corresponding to the formula
space="preserve" listing-type="equation">R--O.sup.⊖
M.sup.⊕
or M.sup.⊕
.spsp.⊖
O--C.sub.6 H.sub.4 --S--C.sub.6 H.sub.4 --O.sup.⊖
M.sup.⊕
with (b) a compound corresponding to the formula ##STR37## wherein M is an alkali metal and R, R1 and R2 have the aforesaid meaning;
the improvement consisting of conducting the process in the presence of a small but catalytic amount of (1) a quaternary ammonium salt having a minimum solubility of at least 1 weight percent in the liquid reaction medium at 25°
C and (2) 1,4-diazabicyclo[2.2.2]octane.
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Abstract
Mixtures of (1) a quaternary ammonium salt(s) and (2) 1,4-diazabicyclo[2.2.2]octane are novel catalysts in the process of reacting an alkali metal phenate, pyridinate or pyrimidinate with an O,O-dialkyl phosphorochloridothioate or O-alkyl phenylphosphonochloridothioate to produce the corresponding phosphorothioates and phenylphosphonothioates. The process is conducted under alkaline conditions in a liquid reaction medium. As an example, O,O-diethyl O-(3,5,6-trichloro-2-pyridyl)phosphorothioate is prepared in excellent yields and purity by reacting sodium 3,5,6-trichloropyridinate with O,O-diethyl phosphorochloridothioate in a stirred methylene chloride-water reaction medium in the presence of a catalytic amount of benzyltriethylammonium chloride and 1,4-diazabicyclo[2.2.2]octane.
7 Citations
15 Claims
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1. In the process of preparing a compound corresponding to the formula ##STR35## wherein:
- R1 and R2 are each independently lower alkyl; and
R is ##STR36## wherein;
n is 0, 1, 2 or 3; andX is nitro, cyano, halo, lower alkyl, lower alkoxy, lower alkylthio or lower alkylsulfinyl, with the proviso that R does not bear more than one nitro group, lower alkylthio group or lower alkyl-sulfinyl group; by reacting in an inert liquid reaction medium under neutral or alkaline conditions (a) a compound corresponding to the formula
space="preserve" listing-type="equation">R--O.sup.⊖
M.sup.⊕
or M.sup.⊕
.spsp.⊖
O--C.sub.6 H.sub.4 --S--C.sub.6 H.sub.4 --O.sup.⊖
M.sup.⊕with (b) a compound corresponding to the formula ##STR37## wherein M is an alkali metal and R, R1 and R2 have the aforesaid meaning; the improvement consisting of conducting the process in the presence of a small but catalytic amount of (1) a quaternary ammonium salt having a minimum solubility of at least 1 weight percent in the liquid reaction medium at 25°
C and (2) 1,4-diazabicyclo[2.2.2]octane. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15)
- R1 and R2 are each independently lower alkyl; and
Specification