4'4'-Dioxaspiro-spirocyclically substituted terminates (I), are new. 4'4'-Dioxaspiro-spirocyclically substituted terminates of formula (I), are new. W 1>；H, alkyl, alkenyl, alkynyl, halo, alkoxy, haloalkyl, haloalkoxy or CN； X : halo, alkyl, alkenyl, alkynyl, alkoxy, haloalkyl, haloalkoxy, NO 2or CN； Y 1>；, Z : H, alkyl, alkenyl, alkynyl, alkoxy, halo, haloalkyl, haloalkoxy, CN or NO 2； AB 1>；C : 5-6-membered ketal (optionally substituted by alkyl, haloalkyl, alkoxy, alkoxyalkyl or optionally substituted phenyl)； G : metal ion equivalent or ammonium ion； and m, n : 1-2. Independent claims are included for: (1) the preparation of (I)； (2) an agent comprising an active agent combination comprising (I), and at least a compound for improving the crop plant compatibility such as: e.g. AD-67, MON-4660, dicyclonone (BAS-145138), benoxacor, 5-chloro-quinolin-8-oxy-acetic acid-(1-methyl-hexylester), cumyluron, cyometrinil, 2,4-D, 2,4-DB, daimuron, dymron, dicamba, dimepiperate, DKA-24, dichlormid, fenclorim, flurazole, fluxofenim, furilazole (MON-13900), lactidichlor, 4-chloro-o-(tolyloxy)-acetic acid, mecoprop, 2-dichloromethyl-2-methyl-1,3-dioxolane, 2-propenyl-1-oxa-4-azaspiro[4.5]decane-4-carbodithioate, 1,8-naphthalic acid anhydride, oxabetrinil, 2,2-dichloro-N-(1,3-dioxolan-2-yl-methyl)-N-(2-propenyl)-acetamide, 3-dichloroacetyl-2,2-dimethyl-oxazolidine, 3-dichloroacetyl-2,2,5-trimethyloxazolidine, 4-(4-chloro-o-tolyl)-butteric acid, 4-(4-chloro-phenoxy)-butteric acid, diphenylmethoxy acetic acid, diphenylmethoxy acetic acid-methylester, diphenylmethoxy acetic acid-ethylester, 1-(2-chloro-phenyl)-5-phenyl-1H-pyrazol-3-carboxylic acid-methylester, 1,2-(dichloro-phenyl)-5-methyl-1H-pyrazol-3-carboxylic acid-ethylester, 1-(2,4-dichlorophenyl)-5-isopropyl-1H-pyrazol-3-carboxylic acid-ethylester, 1-(2,4-dichloro-phenyl)-5-(1,1-dimethyl-ethyl)-1H-pyrazol-3-carboxylic acid-ethylester, 5-(2,4-dichloro-benzyl)-2-isoxazolin-3-carboxylic acid-ethylester, 5-phenyl-2-isoxazol
