group containing from 1 to 3 carbon atoms; R4 represents a halogen atom, a nitrile group, a nitro group, an -SCH3 group, a C1-6 alkylcarbonyl group, a C3-6 cycloalkylcarbonyl group, a -CX3 group, a -WCX3 group, a -(CH2)nCX3 group, a -(CX2)n CX3 group, a -W(CX2)nC...
To understand the scope of these approaches and the importance of atom mapping, suppose we look for reactions that let us obtain an alcohol from a carbonyl group, such as an ester. If we look for reactions in which there is a carbonyl group in the starting material and alcohol in the pro...
Define chemical group. chemical group synonyms, chemical group pronunciation, chemical group translation, English dictionary definition of chemical group. Noun 1. chemical group - two or more atoms bound together as a single unit and forming part of a mo
CAS No:N/A ||Chemical Formula:C17H32N2O5 ||Molecular Weight:344.45200 ||Exact Mass:344.23112 ||3,3'-((carbonylbis(azanediyl))bis(methylene))bis(5-methylhexanoic acid) http://www.pipitech.com/pregabalin-dimer-a.html 相关产品 我们有下列相关杂质对照品,请加QQ87478684或打电话18371201331(微信同...
Compound of formula (I) wherein: A is a bicyclic heteroaryl, optionally substituted with one or more substituents; B is linker group connecting group A to group D and comprising a 3 or 4 atom linker where each atom is independently selected from carbon, oxygen, nitrogen and sulphur and is...
The pH of all of these mixed formulations were maintained constant at 7.2 while all of them showed significant solution turbidity, the 0.7 molar ratio formula- tions were the most turbid. At this pH, the degree of dissociation of the carboxylate group is close to one25,27. In these ...
and 3-methyl-4-oxopentanoic acid. In reactions similar to (12.4.13), δ-ketonic acids generate pyranones. Cyclic lactones are formed even when the carbonyl group is part of a cycloalkane, as shown below for 3-methyl-3-(4-methyl-2-oxo-cyclohexyl)butanoic acid that generates 4,4,7-trim...
Transition of aglycone compounds having a 7(8) double bond, and a carbonyl group at C-16, to compounds oxidized at C-22 or C-23 without the oxygen at C-16 (b) Transition of aglycone molecule from 9(11) double bond and C-16 keto group to compounds having oxygen at C-16, and th...
The CxHy fragments accounted for 75% of WISOM, revealing that hydrocarbon-like structures were predominant in WISOM. The contribution of the CxHyO>1 group was enhanced in winter (mean: 10%). The increase of oxygenated groups in winter might be due to the enhanced contributions of the long-...
The present invention relates to compounds of the general formula (I): wherein: R 4 R 4 represents hydrogen, R 4 R 4, -C (= Y) -NHR 4 R 4, -SO 2 R NH 4 R 4 ^ -C (= Z ^ 1 ^) - R ^ 4 ^, -SO ~ 2 -R ^ 4 ^ OR -C (= Z ^ 1 ^) -OR ^ 4 ^; R 2 ...