Abstract: Process for preparing amino- and carbamoyl-substituted anthraquinones by Diels-Alder reaction of an N-butadienylcarbamic acid ester of the formula H.sub.2 C.dbd.CH--CH.dbd.CH--NH--COOR.sup.2, wherein R.sup.2 is alkyl or phenylalkyl, with a 1,4-naphthoquinone or with 1,4-benzoquinone to form a carbamoyl-substituted hydroanthraquinone intermediate and by oxidation of this intermediate with an oxygen-containing gas in a tertiary amine and in the presence of a copper salt to obtain a carbamoyl-substituted anthraquinone product. The Diels-Alder reaction and the oxidation reaction can be carried out as a one-pot synthesis or in separate steps. The carbamic acid ester reactant provides a blocking group represented by --COOR.sup.2, and this blocking group is optionally removed by treatment of the carbamoyl-substituted anthraquinone with an alkaline hydroxide solution.

Abstract: A process for preparing pyrimidines of the formula I ##STR1## where R.sup.1 is C.sub.1 -C.sub.8 -alkyl, C.sub.7 -C.sub.12 -aralkyl or phenyl andR.sup.2, R.sup.3 and R.sup.4 are each, independently of one another, hydrogen, C.sub.1 -C.sub.8 -alkyl, C.sub.7 -C.sub.12 -aralkyl or phenyl,entails reacting nitriles of the formula IIR.sup.1 -C.tbd.N (II)where R.sup.1 has the abovementioned meaning, with 1,3-diaminopropanes of the formula III ##STR2## where R.sup.2 to R.sup.4 have the abovementioned meanings, in the presence of copper(II) acetate at from 150.degree. to 250.degree. C. to give the tetrahydropyrimidine of the formula IV ##STR3## where R.sup.1 to R.sup.4 have the abovementioned meanings, and dehydrogenating the tetrahydropyrimidine of the formula IV with Raney nickel at from 150.degree. to 300.degree. C. to give the pyrimidine of the formula I.

Abstract: Tert-amyl compounds of the general formula I ##STR1## and novel processes for preparing 2-tert-amylbutadiene by dehydrating 3,4,4-trimethylhex-1-en-3-ol at from 100.degree. to 350.degree. C. and from 0.01 to 50 bar on acidic catalysts, its preparation by partially hydrogenating 3,4,4-trimethyl-hex-1-yn-03-ol at from 0.degree. to 50.degree. C. and from 0.01 to 50 bar and its preparation by reacting tert-amyl methyl ketone (3,3-dimethylpentan-2-one) with acetylene in the presence of basic catalysts at from 0.degree. to 60.degree. C. and from 0.01 to 50 bar, and also the preparation of 2-tert-amylanthraquinone by reacting 2-tert-amylbutadiene with 1,4-naphthoquinone at from 20.degree. to 200.degree. C. and from 0.01 to 50 bar to give 2-tert-amyl-1,4,4a,9a-tetrahydroanthraquinone and then oxidizing the latter in the presence of a strong base at from 0.degree. to 50.degree. C. are described.

Abstract: A process for the preparation of benzo[b]thiophenes of the general formula I ##STR1## in which R.sup.1, R.sup.2, R.sup.3, R.sup.4 independently denote hydrogen, C.sub.1 -C.sub.4 alkyl, C.sub.1 -C.sub.4 alkoxy, C.sub.1 -C.sub.4 haloalkyl, nitro, cyano, halo, C.sub.1 -C.sub.4 alkylcarbonyl, benzoyl, C.sub.1 -C.sub.4 alkylcarbonylamino, benzoylamino,N-(C.sub.1 -C.sub.4 alkyl)phenylamino, C.sub.1 -C.sub.4 alkoxycarbonyl, C.sub.1 -C.sub.4 alkylsulfonyl, phenylsulfonyl, aminosulfonyl, aminocarbonyl, C.sub.1 -C.sub.4 phenylalkyl and nitrobenzyl or R.sup.1 +R.sup.2 or R.sup.2 +R.sup.3 or R.sup.3 +R.sup.4 denote a butadienediyl chain optionally substituted by R.sup.1 to R.sup.4, in whicha) thiophenols of the general formula II ##STR2## in which the substituents R.sup.1 to R.sup.4 have the aforementioned meanings, are reacted with chloroacetaldehyde at a temperature ranging from 0.degree. to 150.degree. C. andb) the resulting (arylthio)acetaldehydes of the general formula III ##STR3## in which the substituents R.sup.

Abstract: A process for producing selected 3-trihalomethyl-5-lower alkoxy-1,2,4-thiadiazole compounds by the reaction of N-halotrihaloacetamidines with alkali metal xanthate salts.