Abstract: Compounds having the formula ##STR1## wherein R.sub.1 denotes hydrogen atom, halogen group atom or methyl radical,R.sub.2 denotes cyclohexyl radical, phenyl radical or phenyl radical substituted with methyl radical or nitro radical, andX denotes oxygen atom or sulfur atom,are useful for the control of phytophthora diseases and downy mildew of vegetable and fruit trees.The compounds of formula [I] can be prepared by reacting compounds having the formula ##STR2## wherein R.sub.1, R.sub.2 and X are defined previously, are reacted with a carbonic acid derivative in the presence of an acid-binding agent.

Abstract: Compounds of the general formula ##STR1## wherein X is trifluoromethyl or halogen,R.sub.1 is hydrogen, lower alkyl, lower alkenyl or benzyl,R.sub.2 is lower alkyl,R.sub.3 is hydrogen, alkyl or alkali metal,Y is oxygen or sulfur, andn is 0, 1 or 2;are useful as herbicides.

Abstract: A compound of the general formula ##STR1## wherein R.sub.1 is lower alkyl,R.sub.2 is selected from the group consisting of lower alkyl, lower alkenyl and lower alkynyl,A is a formula which is selected from the formula consisting of: ##STR2## where R.sub.3 is selected from the group consisting of hydrogen and lower alkyl,R.sub.4 is selected from the group consisting of lower alkyl and phenyl, andR.sub.3 forms cyclo-alkylene of 4 to 5 carbon atoms by combining with R.sub.4 ; ##STR3## where R.sub.5 and R.sub.7 are selected from the group consisting of hydrogen and lower alkyl andR.sub.6 is lower alkyl; and ##STR4## where R.sub.8 is selected from the group consisting of hydrogen and lower alkyl andR.sub.9 is lower alkyl;Or a metal salt of the compound defined herein above is useful as herbicide.