Abstract: A process for preparing 2,3-dihydro-7-aminobenzofurans by reaction between 2,3-dihydro-7-halobenzofurans and ammonia in the presence of a copper catalyst, is described. The 2,3-dihydro-7-aminobenzofurans are useful as intermediates for insecticides.

Abstract: A process for preparing 2,2-dimethyl-2,3-dihydro-7-hydroxybenzofuran, which comprises(a) heating a 2,2-dihalo-6-halo-6-(1-haloisobutyl)cyclohexanone in the presence of a dehydrohalogenation agent, hydroylzing the resulting 2-isobutenyl-6-halophenol in the presence of a copper compound catalyst and an alkali, and cyclizing the resulting 1,2-dihydroxy-3-isobutenylbenzene in the presence of a cyclization catalyst,(b) heating a 2,2-dihalo-6-halo-6-(1-haloisobutyl) cyclohexanone in the presence of a dehydrohalogenation agent, reacting the resulting 2,2-dimethyl-2,3-dihydro-7-halobenzofuran with at least one metal selected from the group consisting of lithium, sodium and magnesium, oxidizing the resulting metal compound, and hydrolyzing the oxidized metal compound, or(c) heating a 2,2-dihalo-6-halo-6-(1-haloisobutyl) cyclohexanone in a carboxylic acid in the presence of a salt of a carboxylic acid.

Abstract: A 2,2-dihalo-6-halo-6-(1-haloisobutyl)cyclohexanone represented by the general formula ##STR1## where each of X.sup.1, X.sup.2, X.sup.3 and X.sup.4 is a halogen atom.

Abstract: This invention relates to an improved process for producing certain phosphinic acid derivatives of aminothio methyl carbamate by reacting N-(halothio)phosphinic acid amide and a carbamate compound in the presence of a cupric catalyst in high yields. These compounds are known to be useful as insecticides.

Abstract: Hydrocarbons are reacted with a tri-halogenoacetate of the formula ##EQU1## wherein X, Y and Z each represents a halogen atom and M represents a mono valent metal of group Ib to form the corresponding complexes, and then the thus formed complexes are decomposed to selectively separate the desired hydrocarbon components. The used tri-halogenoacetate also is recovered by the decomposition of the complexes.

Abstract: Hydrocarbons are reacted with a silver tri-halogenomethane sulfonate of the formula ##EQU1## wherein X, Y and Z each represents a halogen atom, to form the corresponding complexes, and then the thus formed complexes are decomposed to selectively separate the desired hydrocarbon components. The used silver tri-halogenomethane sulfonate also is recovered by the decomposition of the complexes.