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Screenshot of the CAS Common Chemistry database with information about caffeine ().. A CAS Registry Number [1] (also referred to as CAS RN [2] or informally CAS Number) is a unique identification number, assigned by the Chemical Abstracts Service (CAS) in the US to every chemical substance described in the open scientific literature, in order to index the substance in the CAS Registry.
Isobutane is the principal feedstock in alkylation units of refineries. Using isobutane, gasoline-grade "blendstocks" are generated with high branching for good combustion characteristics.
Chemical Abstracts Service Building B in August 2009. Columbus, Ohio. STN (Scientific & Technical Information Network) International is operated jointly [4] by CAS and FIZ Karlsruhe, and is intended primarily for information professionals, using a command language interface.
As 2 O 5: arsenic pentoxide: 1303–28–2 As 2 P 2: arsenic diphosphide: 12512–03–7 As 2 S 3: arsenic trisulfide: 1303–33–9 As 2 S 4: arsenic tetrasulfide: 1303–32–8 As 2 S 5: arsenic pentasulfide: 1303–34–0 As 2 Se: arsenic hemiselenide: 1303–35–1 As 2 Se 3: arsenic triselenide: 1303–36–2 As 2 Se 5: arsenic ...
From this mixture, the cyclic siloxanes including D 5 can be removed by distillation. In the presence of a strong base such as KOH, the polymer/ring mixture is equilibrated, allowing complete conversion to the more volatile cyclic siloxanes: [10] [(CH 3) 2 SiO] 5n → n [(CH 3) 2 SiO] 5. where n is a positive integer. D 4 and D 5 are also ...
The state also set a PFOS standard at 13 ppt. [24] The state had set a standard for PFNA in September 2018, with an MCL of 13 ppt. [25] [26] In August 2020 the State of Michigan adopted drinking water standards for 5 previously unregulated PFAS compounds and lowered acceptable levels for 2 previously regulated compounds PFOS and PFOA to 16 ppt ...
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However, protic solvents with reactive free hydroxy groups are undesirable in battery systems. The epoxy alcohol glycidol is formed in the decarboxylation of glycerol-1,2-carbonate at temperatures > 175 °C, reduced pressure and in the presence of acidic [ 28 ] or basic [ 29 ] (e.g. potassium oxide ) catalysts in yields of 75 to 85%