Tetrahydro-2-(nitromethylene)-2H-1,3-thiazines

DETAILED DESCRIPTION I claim as my invention 1.
A resonance hybrid in which the two significant forms which contribute thereto are represented by the formula ##SPC4## and including when R is hydrogen, the tautomeric form represented by the formula ##SPC5## wherein R is hydrogen, or contains up to eight carbon atoms and is alkyl, alkenyl, alkoxyalkyl, cycloalkylalkyl, cyanoalkyl, haloalkenyl, phenalkyl or alkoxycarbonylvinyl.
R.
sup.
1 is hydrogen or contains up to eight carbon atoms and is alkyl, alkenyl, alkynyl, haloalkyl, haloalkenyl, halo(hydroxy)alkyl, alkoxyalkyl, cyanoalkyl, hydroxyalkyl, alkoxycarbonylalkyl, alkylcarbonylalkyl, alkylthioalkyl, alkylsulfinylalkyl, phenalkyl or phenylthio optionally substituted on the ring by one or more of halogen, nitro, cyano, alkyl, phenyl, alkoxy or phenoxy; halogen; aminomethyl, --CH.
sub.
2 -NR.
sup.
2 R.
sup.
3, R.
sup.
2 is alkyl, hydroxyalkyl, alkoxyalkyl, cycloalkyl, alkenyl, phenyl or phenalkyl, and R.
sup.
3 is hydrogen or one of the moieties represented by R.
sup.
2 ; ##SPC6## wherein n is zero, one or two, and R.
sup.
4 is a heteromonocyclic moiety of from five to six carbon atoms in the ring, containing in the ring carbon atoms and one to two of oxygen (--O--), sulfur (--S--) and nitrogen (=N- or -NH-) bonded to carbon in the ring; or is ##SPC7## and salts of such compounds in which R is hydrogen.
2.
A resonance hybrid according to claim 1 wherein R is hydrogen.
3.
A resonance hybrid according to claim 2 wherein R.
sup.
1 is hydrogen.
4.
A resonance hybrid according to claim 2 wherein R.
sup.
1 is bromine.
5.
A resonance hybrid according to claim 2 wherein R.
sup.
1 is dimethylaminomethyl.
6.
A resonance hybrid according to claim 2 wherein R.
sup.
1 is 1-piperidinomethyl.
7.
A resonance hybrid according to claim 2 wherein R.
sup.
1 is 4-morpholinomethyl.




Description:
DESCRIPTION OF THE INVENTION It has been found that useful insecticidal activity is possessed by certain tetrahydro-2-(nitromethylene)-2H-1,3-thiazines.
These compounds have been found to be resonance hybrids, the principal forms contributing thereto being described by the formulae: ##SPC1## Wherein the symbols have the respective meanings set out hereinafter