Abstract: The present invention relates to herbicidally active pyridino-/pyrimidino-thiazole derivatives, as well as to processes and intermediates used for the preparation of such derivatives. The invention further extends to herbicidal compositions comprising such derivatives, as well as to the use of such compounds and compositions in controlling undesirable plant growth: in particular the use in controlling weeds, in crops of useful plants.

Abstract: The present invention relates to herbicidally-active pyridino-/pyrimidino-pyrazole derivatives, as well as to processes and intermediates used for the preparation of such derivatives. The invention further extends to herbicidal compositions comprising such derivatives, as well as to the use of such compounds and compositions in controlling undesirable plant growth: in particular the use in controlling weeds, in crops of useful plants.

Abstract: The present invention relates to herbicidally active pyridino-/pyrimidino-thiazole derivatives, as well as to processes and intermediates used for the preparation of such derivatives. The invention further extends to herbicidal compositions comprising such derivatives, as well as to the use of such compounds and compositions in controlling undesirable plant growth: in particular the use in controlling weeds, in crops of useful plants.

Abstract: The present invention relates to herbicidally-active pyridino-/pyrimidino-pyrazole derivatives, as well as to processes and intermediates used for the preparation of such derivatives. The invention further extends to herbicidal compositions comprising such derivatives, as well as to the use of such compounds and compositions in controlling undesirable plant growth: in particular the use in controlling weeds, in crops of useful plants.

Abstract: The present invention relates to herbicidally active pyridino-/pyrimidino-thiazole derivatives, as well as to processes and intermediates used for the preparation of such derivatives. The invention further extends to herbicidal compositions comprising such derivatives, as well as to the use of such compounds and compositions in controlling undesirable plant growth: in particular the use in controlling weeds, in crops of useful plants.

Abstract: A herbicidal compound of formula (I): ##STR1## or N-oxide or quaternised derivative thereof; Ar is an optionally substituted aryl or heterocyclic ring system;W is O or NR.sup.1 where R.sup.1 is H or lower alkyl;A, B, D are independently selected from N, NR.sup.2, N--E, CR.sup.6, C--E or C(R.sup.6)E;wherein E is: ##STR2## provided 2 of A, B and D are N, NR.sup.2 or N--E; one of A, B and D is CR.sup.6, C--E or C(R.sup.6) E and at least one of A, B or D carries a group E;where R.sup.2 is H, OR.sup.7, CN, COOR.sup.8, alkyl or haloalkyl;R.sup.3 and R.sup.4 are independently selected from H, optionally substituted alkyl, alkenyl or alkynyl, halogen, NR.sup.9 R.sup.10, or R.sup.3 and R.sup.4 together with the carbon to which they are attached form an optically substituted alkenyl or cycloalkyl group;X is (CH.sub.2).sub.n, CH.dbd.CH, CH(OR.sup.16)CH.sub.2 or COCH.sub.2 where n is O, 1 or 2;R.sup.5 is CO.sub.2 R.sup.11, CN, COR.sup.11, CH(OH)R.sup.11, CH(OR.sup.11)R.sup.12, CSNH.sub.2, COSR.sup.11, CSOR.sup.