The invention relates to novel compounds of formula (I), in which W, X, Y, Z, A, B, D, and G have the meanings specified above, to a plurality of methods and intermediate products for producing same, and to the use thereof as pest control agents and/or herbicides and/or fungicides. The invention further relates to selectively herbicidal agents, which contain halogen-substituted spirocyclic ketoneols and to a compound that improves compatibility with cultivated plants. The invention further relates to the heightening of the effect of plant protection agents containing in particular halogen-substituted spirocyclic ketoenols by adding ammonium salts or phosphonium salts and possibly penetration enhancers, to the corresponding agents, to methods for producing same, and to the use thereof in plant protection as pest control agents and/or fungicides and/or to prevent undesired plant growth. The invention further relates to substituted 3-(biphenyl-3-yl)-8,8-difluoro-hydroxy-1-azaspiro[4.5]dec-3-en-2-ones of formula (Ia) for therapeutic purposes, to pharmaceutical agents, and to the use thereof in treatment, in particular for the prophylaxis and treatment of tumor diseases.
