prov:value
| - Compounds of the formulae IIa and IIIa ##STR8## in which X is chlorine or bromine, R is methyl and especially hydrogen, R.sub.1 is hydrogen, Cl, Br, F, I, formyl, --CH(OCH.sub.3).sub.2, --CH(OC.sub.2 H.sub.5).sub.2, ##STR9## --CH.dbd.CH--CN,--CH.dbd.CHCOOCH.sub.3, --CH.dbd.CHCOOC.sub.2 H.sub.5, C.sub.1-4 -alkyl, C.sub.1-4 alkoxy, phenoxy, di-(C.sub.1-2 -alkyl)-amino, --NO.sub.2, --CN, --CF.sub.3,
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