SU384827A1 - METHOD OF OBTAINING DIORGANOTIOPHOSPHORYL SULPHENYLAMIDES - Google Patents

Description

one

This invention relates to a process for the preparation of diorganothiophosphoryl sulphenyl amides of the general formula

/ R

(RO), PSN II R

where R is alkyl or aryl;

R is hydrogen, alkyl or alkenyl;

 alkyl or alkenyl;

R and R, together with the nitrogen atom, can form a heterocyclic radical, which can be used as a means of combating plant pests.

Opos-ab is known (the preparation of diorganothiophosphoryl sulphenyl amides by the interaction of dithiophosphoric acid salts with chloramines. The yield is 80%.

The disadvantages of this method are the use of chloramines with oxidative and chlorinating properties, which leads to a number of side reactions. In addition, unsaturated chloramines are unstable and difficult to produce in pure form.

In order to simplify the process and increase the yield of the target product, it has been proposed to perform diorganothiophosphoryl sulphenyl amides

when treating bis- (diorganothiophosphoryl) disulfide of the general formula

one

(RO) 2P-S-S-P (OR).,

Iiii

SS

where R is as indicated above, a primary or secondary amine of the general formula

ten

Rx

) NH

R

where R and R are as defined above.

The process is preferably carried out in an inert organic solvent, for example diethyl ether, benzene.

Target products formed in quantitative yield are recovered by known techniques. When a double excess of amine is used, an amine salt is also formed and

O, O-diorgano-dithiophosphoric acid, which can be used to prepare the starting bis (di-organo-thiophosphoryl) disulfide.

The reaction is usually carried out at 10-100 ° C.

If the salt is amine and O, O-diorganodithiofos xR

(RO) 2PN

Table I

(RO) 2PSN

xH

table 2