Substituted 5-hydroxy-2-heteroaryl-3-phenylpentanonitrile derivatives, processes for their preparation and their use as herbicides and/or plant growth regulators

A compound of formula (I) and/or salt thereof,

• wherein
• Q represents a mono- or bicyclic heteroaromatic radical with in total 1 to 9 carbon ring atoms, where the heteroatom or heteroatoms in the heteroaromatic ring are selected from the group consisting of N, O, S, P, B, Si, and Se, represents hydrogen or a hydrolyzable radical,
• (R2)n represent n substituents R2, where R2 (if n=1) or each of the substituents R2 (if n is greater than 1) independently of one another represents fluorine, chlorine, bromine, iodine, or methyl,
• (R3)m represents m substituents R3,
• where R3 (if m=1) or each of the substituents R3 (if m is greater than 1) independently of one another represents fluorine, chlorine, bromine, iodine, cyano, nitro, trifluoromethyl or trifluoromethoxy,
• n represents 0, 1, 2, or 3, and
• m represents 0, 1, 2, or 3.