method of producing mono-(di-, tetra-)methyl-1,2-bis-(1,3
2,2,4,4-Tetramethyl-1,3-cyclobutanediol (CBDO) is an aliphatic diol. This diol is produced as a mixture of cis- and trans-isomers, depending on the relative stereochemistry of the hydroxyl groups. It is used as a monomer for the synthesis of polymeric materials. CBDO is currently being researched as an alternative to bisphenol A (BPA).
Caeser (1948) synthesized 2,5-di-(1,1,3,3-tetramethylbutyl)thiophene by reacting diisobutylene with thiophene and isolated it as a low-melting solid (b.p. 146–147°C, m.p. 36–37°C). He correctly proposed the structure from its physical properties as well as from the work by Kutz & Corson (1946) on the mono-alkyl derivatives.
Production. The synthesis and properties of tetramethylurea were comprehensively described. The reaction of dimethylamine with phosgene in the presence of e. g. 50 % sodium hydroxide solution and subsequent extraction with 1,2-dichloroethane yields tetramethylurea in 95% yield.
The category contains mono constituent, multi-constituent and UVCB substances with fatty acid carbon chain lengths ranging from C5 - C28, which are mainly saturated but also mono unsaturated C16 and C18, polyunsaturated C18, branched C5 and C9,branched C14 – C22 building mono-, di-, tri-, and tetra esters with an alcohol (i.e.polyol).
1,2,3,5-Tetrachlorobenzene | C6H2Cl4
The half-life of 1,2,3,5-tetrachlorobenzene in sewage sludge amended soil was 45.4 days(2). An enriched microbial culture derived from sediment of the Rhine River reductively dechlorinated 1,2,3,5-tetrachlorobenzene to 1,3,5-trichlorobenzene in 280 days after a lag period of 47 days(3).
1-methyl-4-[4-(4,4,5,5-tetramethyl-1,3,2-dioxaborolan-2-yl) benzyl] piperazine CAS Number 938043-30-2. Empirical Formula (Hill Notation) C 18 H 29 BN 2 O 2. Molecular Weight 316.25 . MDL number MFCD09266182. PubChem Substance ID 329768576. NACRES NA.22
Borazine finds application in the Rh-catalyzed hydroboration of olefins and acetylenes leading to mono-, di-, and trialkylborazines, and dialkylvinylborazines. 373 Bis(pinacolato)diboron is widely used in the catalytic monoboration and diboration of carbon–carbon multiple bonds. 374 It is commercially available, and its preparation has been
1,3,5-Trichlorobenzene | C6H3Cl3
Significant levels of radioactivity from 1,3,5-trichlorobenzene remained in the tissues after 56 days for all tissues examined. Approximately 85% of the 1,3,5-trichlorobenzene and 92% of the 1,2,3-trichlorobenzene were excreted within 24 hr of dosing. Compartmental analysis showed 1,3,5-trichlorobenzene to have the highest values for the linear
Although chronic toxicity data is available for members within the polyol esters category in accordance to Regulation (EC) No 1907/2006, Annex IX 9.1 Aquatic toxicity, further tests on long term toxicity to invertebrates for the PE esters tetra-esterification products of 2,2-bis[[(1-oxopentyl)oxy]methyl]propane-1,3-diyl divalerate (CAS 15834-04
Exposure Data - Polychlorinated Biphenyls and Polybrominated
Based on the number of bromine substituents, there are 10 homologous groups of PBBs (monobromobiphenyls to decabromobiphenyls). The mono-, di-, tri-, tetra-, penta-, hexa-, hepta-, octa-, nona-, and decabromo congeners can exist in 3, 12, 24, 42, 46, 42, 24, 12, 3, and 1 form(s), respectively . Homologues with different patterns of substitution
Towards a global historical emission inventory for selected
In particular, the information on imports and exports for the principal users of PCBs around the time of peak production is considered to be fairly reliable. The estimates account for a reported historical global production of ∼1.3 million t PCBs, more than 70% of which are tri-, tetra- and pentachlorinated biphenyls.
2,2-bis[[(1-oxoisooctadecyl)oxy]methyl]-1,3-pro... - Brief
There are four methods to aggregate and summarise data, depending on the available data and endpoint. An icon is displayed to indicate the type of aggregation and summarisation performed: [R] Range of values – Range of results values (min-max) and range values of experimental condition(s) (min-max).