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The first synthetic herbicides were discovered in the 1930's and 1940's. This was the era when synthetic antibiotics, plastics, and many other materials became available. Synthetic pesticides became popular rapidly after World War II. Crop yields increased significantly through the discovery of 2,4-D.
Name Stores First store in Serbia Parent; P.S. Fashion: 64 [23]: 2006: P.S. Fashion: Extreme Intimo [Wikidata]: 60 [24]: 1992 Extreme Intimo Legend: 48 [25]: 1998 ...
H & M Hennes & Mauritz AB, commonly known by its brand name H&M, is a Swedish multinational fashion retailer headquartered in Stockholm. Known for its fast fashion business model, H&M sells clothing, accessories, and homeware. The company has a significant global presence, operating thousands of stores across 75 geographical markets and ...
Hexamethylenediamine or hexane-1,6-diamine, is the organic compound with the formula H 2 N(CH 2) 6 NH 2. The molecule is a diamine, consisting of a hexamethylene hydrocarbon chain terminated with amine functional groups. The colorless solid (yellowish for some commercial samples) has a strong amine odor. About 1 billion kilograms are produced ...
Hexamethylenetetramine (HMTA), also known as 1,3,5,7-tetraazaadamantane, is a heterocyclic organic compound with diverse applications. [2] [3] It has the chemical formula (CH 2) 6 N 4 and is a white crystalline compound that is highly water soluble in water and polar organic solvents.
4 c 3 h 4 n 2 + c(o)cl 2 → (c 3 h 3 n 2) 2 co + 2 [c 3 h 3 n 2 h 2]cl In this conversion, the imidazole serves both as the nucleophile and the base. An alternative precursor 1-(trimethylsilyl)imidazole requires more preparative effort with the advantage that the coproduct trimethylsilyl chloride is volatile.
Macrocyclic polyamines analogous to crown ethers: 1,4,7-triazacyclononane ((NHCH 2 CH 2) 3) and cyclen ((NHCH 2 CH 2) 4). A related tetraaza macrocycle is cyclam. Tris(2-aminoethyl)amine (N(CH 2 CH 2 NH 2) 3) is a branched polyamine that is a minor side product of the polyethyleneamine process. A related tripodal polyamine is 1,1,1-tris ...
2 NH(OH)(SO − 3) + 2 H 2 O → [NH 3 OH] 2 SO 4 + SO 2− 4. Solid NH 2 OH can be collected by treatment with liquid ammonia. Ammonium sulfate, [NH 4] 2 SO 4, a side-product insoluble in liquid ammonia, is removed by filtration; the liquid ammonia is evaporated to give the desired product. [4] The net reaction is: 2 NO − 2 + 4 SO 2 + 6 H 2 ...
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