Montedison S.p.a.

Pier M Boschi

Franco Gozzo

Angelo Longoni

Vincenzo Di Toro

A process is herein described for obtaining lower alkyl esters of C-alkyl-tartronic or C-halogenalkyl-tartronic acids according to the reaction: ##STR1## in which R and R.sup.2, like or unlike each other, may be alkyls having C.sub.1 -C.sub.5 or halogenalkyls having C.sub.1 -C.sub.5 and R.sup.1 is an alkyl having C.sub.1 -C.sub.5.

Process for preparing alkyl esters of C-alkyl-tartronic or

Phosphoric or thiophosphoric esters of 5(3)-hydroxypyrazoles are disclosed having the formula: ##STR1## wherein: R=H; alkyl with 1-7 carbon atoms optionally substituted with halogens, CN, and carboalkoxy groups; phenyl optionally substituted; benzyl; alkenyl; or alkynyl;

Phosphoric and thiophosphoric esters of 5(3)-hydroxypyrazoles exerting

Chloroformates of alkyl esters of C-alkyl or C-haloalkyl tartronic acids of the general formula: ##STR1## in which: R represents an alkyl or haloalkyl group having from 1 to 5 carbon atoms, and

Chloroformates of alkyl esters of C-alkyl- or C-haloalkyl tartronic

1,2,4-triazol-(5)-yl-[thio] phosphates are disclosed having the formula ##STR1## wherein R.sup.1 =alkyl with from 1 to 5 carbon atoms;

Phosphoric esters derived from 1,2,4-triazole having an insecticidal,

Process for the preparation of 3-chloro-5-hydroxypyrazoles

Semicarbazones and carbalkoxy hydrazones substituted in 2 position are synthesized by alkylation of the corresponding semicarbazones and carbalkoxy hydrazones, using alkyl halides or alkyl sulphates as alkylating agents.

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Piacenza, Italy

Pier M Boschi