prov:value
| - Compounds of the formulae IIa and IIIa ##STR8## in which X is chlorine or bromine, R is methyl and especially hydrogen, R1 is hydrogen, Cl, Br, F, I, formyl, --CH(OCH3)2, --CH(OC2 H5)2, ##STR9## --CH???CH--CN, --CH???CHCOOCH3, --CH???CHCOOC2 H5, C1-4 -alkyl, C1-4 alkoxy, phenoxy, di-(C1-2 -alkyl)-amino, --NO2, --CN, --CF3, C1-4 -alkylsulfonyl, benzyl, --CO--C1-4 -alkyl, --CO-phenyl, --OCO--C1-4 -a
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