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Relevant academic research and scientific papers

Olefin cyclopropanations via sequential atom transfer radical addition-dechlorination reactions

In organic synthesis, cyclopropanation reactions are often performed with Simmons-Smith-type reagents or by transition metal catalyzed reactions of olefins with diazo compounds. A novel method for the synthesis of substituted cyclopropanes is described that is based on a two-step reaction sequence. Olefins are reacted with 1,1'-dichlorides in a Ru-catalyzed atom transfer radical addition (ATRA) process and the resulting 1,3-dichlorides are directly converted into cyclopropanes by reductive coupling with magnesium. This one-pot procedure is applicable to a variety of substrates and can be performed in an inter- or intramolecular fashion. Schweizerische Chemische Gesellschaft.

Ruthenium vs. osmium complexes as catalysts for atom transfer radical addition reactions

The catalytic activity of [Cp*OsBr2(PPh 3)] in conjunction with Mg has been evaluated for atom transfer radical addition (ATRA) and cyclization (ATRC) reactions. The Os complex enabled these reactions to be performed with

Synergistic herbicidal compositions

Synergistic herbicidal activity is displayed by compositions comprising the following two components: (a) a pyrrolidone of the formula STR1 in which X is selected from the group consisting of hydrogen, chlorine and methyl; Y is selected from the group consisting of hydrogen, chlorine and bromine; Z is selected from the group consisting of chlorine and bromine; R1 is selected from the group consisting of hydrogen and C1 -C4 alkyl; R2 is selected from the group consisting of hydrogen, halogen, C1 -C4 alkyl, acetyl, trifluoromethyl, nitro, cyano, C1 -C4 alkoxy, C1 -C4 alkylthio, C1 -C4 alkylsulfinyl, C1 -C4 alkylsulfonyl, trifluoromethylsulfinyl, trifluoromethylsulfonyl, pentafluoropropionamido, and 3-methylureido; and R3 is selected from the group consisting of hydrogen, C1 -C4 alkyl, chlorine and trifluoromethyl; and (b) a phosphonic acid of the formula STR2 in which R4 is selected from the group consisting of C1 -C4 alkyl, C1 -C4 haloalkyl, and --CH2 NHCH2 COOH, at a weight ratio of (a) to (b) of from about 0.1:1 to about 20:1.

Synergistic herbicidal compositions

Synergistic herbicidal activity is displayed by composition comprising the following two components: (a) a pyrrolidone of the formula STR1 in which X is selected from the group consisting of hydrogen, chlorine, and methyl; Y is selected from the group consisting of hydrogen, chlorine, and bromine; Z is selected from the group consisting of chlorine and bromine; R1 is selected from the group consisting of hydrogen and C1 -C4 alkyl; R2 is selected from the group consisting of hydrogen, C1 -C4 alkyl, acetyl, trifluoromethyl, nitro, cyano, C1 -C4 alkoxy, C1 -C4 alkylthio, C1 -C4 alkylsulfinyl, C1 -C4 alkylsulfonyl, trifluoromethylthio, trifluoromethylsulfinyl, trifluoromethylsulfonyl, pentafluoropropionamido, and 3-methylureido; and R3 is selected from the group consisting of hydrogen, C1 -C4 alkyl, chlorine and trifluoromethyl; and (b) a cyclohexenedione of the formula STR2 in which R4 is 1'-(2-hydroxyethylimino)ethyl or acetyl, at a weight ratio of (a) to (b) of from about 0.01:1 to about 10:1.

Synergistic herbicidal compositions

Synergistic herbicidal activity is displayed by compositions comprising the following two components: (a) a pyrrolidone of the formula STR1 in which X is selected from the group consisting of hydrogen, chlorine and methyl; Y is selected from the group consisting of hydrogen, chlorine and bromine; Z is selected from the group consisting of chlorine and bromine; R1 is selected from the group consisting of hydrogen and C1 -C4 alkyl; R2 is selected from the group consisting of hydrogen, halogen, C1 -C4 alkyl, acetyl, trifluoromethyl, nitro, cyano, C1 -C4 alkoxy, C1 -C4 alkylthio, C1 -C4 alkylsulfinyl, C1 -C4 alkylsulfonyl, trifluoromethylthio, trifluoromethylsulfinyl, trifluoromethylsulfonyl, pentafluoropropionamido, and 3-methylureido; and R3 is selected from the group consisting of hydrogen, C1 -C4 alkyl, chlorine and trifluoromethyl; and (b) a m-ureidophenyl carbamate of the formula STR2 in which R4 is C1 -C4 alkyl; R5 is C1 -C4 alkyl; and R6 is selected from the group consisting of hydrogen and C1 -C4 alkyl, 1t a weight ratio of (a) to (b) of from about 0.1: to about 50:1.

Synergistic herbicidal compositions

Synergistic herbicidal activity is displayed by a composition comprising the following two components: (a) a pyrrolidone of the formula STR1 in which X is selected from the group consisting of hydrogen, chlorine and methyl; Y is selected from the group consisting of hydrogen, chlorine and bromine; Z is selected from the group consisting of chlorine and bromine; R1 is selected from the group consisting of hydrogen and C1 -C4 alkyl; R2 is selected from the group consisting of hydrogen, C1 -C4 alkyl, acetyl, trifluoromethyl, nitro, cyano, C1 -C4 alkoxy, C1 -C4 alkylthio, C1 -C4 alkylsulfonyl, C1 -C4 alkylsulfinyl, trifluoromethylthio, trifluoromethylsulfinyl, trifluoromethylsulfonyl, pentafluoropropionamido, and 3-methylureido; and R3 is selected from the group consisting of hydrogen, C1 -C4 alkyl, chlorine and trifluoromethyl; and (b) a urea of the formula STR2 in which R4 is selected from the group consisting of phenyl and substituted phenyl, wherein the substituents are selected from the group consisting of p-chlorophenoxy and alkylacetamido; R5 is selected from the group consisting of hydrogen and C1 -C4 alkyl; and R6 is selected from the group consisting of C1 -C4 alkyl and C1 -C4 alkoxy; at a weight ratio of (a) to (b) of from about 0.01:1 to about 20:1.

Synergistic herbicidal compositions

Synergistic herbicidal activity is displayed by a composition comprising the following two components: (a) a pyrrolidone of the formula STR1 in which X is selected from the group consisting of hydrogen, chlorine, and methyl; Y is selected from the group consisting of hydrogen, chlorine, and bromine; Z is selected from the group consisting of chlorine and bromine; R1 is selected from the group consisting of hydrogen and C1 -C4 alkyl; R2 is selected from the group consisting of hydrogen, C1 -C4 alkyl, acetyl, trifluoromethyl, nitro, cyano, C1 -C4 alkoxy, C1 -C4 alkylthio, C1 -C4 alkylsulfonyl, C1 -C4 alkylsulfinyl, trifluoromethylthio, trifluoromethylsulfinyl, trifluoromethylsulfonyl, pentafluoropropionamido, and 3-methylureido; and R3 is selected from the group consisting of hydrogen, C1 -C4 alkyl, chlorine and trifluoromethyl; and (b) 3-amino-1,2,4-triazole, at a weight ratio of (a) to (b) of from about 0.01:1 to about 20:1.