parent chain. There are always two side chains in ethers {eq}R-O-R {/eq}, the longest of these two side chains is the parent chain. Use the alkane base name to write the name of the parent chain. Example: for a two-carbon parent chain, ethane, a three-carbon parent chain,propane...
Cyclic ethers which have 4 atoms in a ring (one oxygen, three carbons) are calledoxetanes(see picture below). Most other cyclic ethers are named systematically usingIUPACnomenclature rules, although there are a few with frequently used trivial names such as tetrahydrofuran, THF, (see picture bel...
Based on the results obtained, most of these crown ethers were unable to form stable complexes, and only polyether rings that contain 5–10 oxygen atoms with two carbons between each oxygen atom showed good complexation.16 After his seminal discoveries, many other researchers have adopted the use...
Meanwhile, we also determined the enantiomeric excess (ee) of the obtained hemiacetal products. To determine the absolute configuration, (R)-selective alcohol dehydrogenase fromLactobacillus kefirwas used to prepare the standard compounds with complementary chirality starting from lactones, respectively (Supp...
Three new templates were added to the CYANA default library in addition to a previously derived template for oxidized SEC39. The new templates were as follows: (1) a C-terminal amidation template; (2) a template based on selenomethionine where the S-C bond was substituted with Se-C bond ...
The two triethers, PyPyPy and SySySy were dimorphic each with a stable form much resembling metastable α in diffraction pattern, hence presumed to be of a new (more dense) hexagonal type of cross sectional structure. Three dialkyl monoacyl compounds PyPyP, SySyS and SyPyS and also three ...
196,197 The same basic antimony coordination is present in the isostructural M2[Sb4(C6H4O7)2(C6H5O7)2(C6H6O7)4(H2O)2] (M = K or Rb)56,197 which are based upon tetrameric units with three differently charged citrate anions (Figure 31),in Ag2[Sb2(C6H6O7)4]196 and Cu[Sb...
The two triethers, PyPyPy and SySySy were dimorphic each with a stable form much resembling metastable α in diffraction pattern, hence presumed to be of a new (more dense) hexagonal type of cross sectional structure. Three dialkyl monoacyl compounds PyPyP, SySyS and SyPyS and also three ...
The efficient preparation of the cyclic N,O-acetals from lactams by DIBAL reduction followed by direct trapping of the resulting N,O-hemiacetals using TMSOTf/pyridine system is described. In addition, the facile nucleophilic addition of various carbon nucleophiles at the carbonyl carbons of the la...
Figure 2 shows the 1H and the 13C NMR spectra of the copolymer with the mole fraction of BVEEB of 0.5. Because the characteristic absorption due to the vinyloxy protons (6.3-6.6ppm) and carbons (86.7 and 151.6 ppm) disappeared in the 1H and 13C NMR spectra, the extent of cyclization ...