TEMPO-substituted b-keto esters containing sterically different substituents
subjected to the tan-dem reaction afford the corresponding in-dole-containing tertiary alcohol in good to excellent yields (compounds 26~29, 31) under optimized con-ditions.
The birefringence properties of the molecular structure of methacrylate polymers, with the exception of the ester substituent
, are expected to be located near PMMA in the birefringence map because the [[gamma].
We also evaluated cellulose tribenzoate derivatives with various substituents
on the phenyl groups, and found that tris(4-methylbenzoate) showed a much better chiral recognition than cellulose tribenzoate to many racemates.
This high value implies that, when R = phenyl, the substituent
and the pyrogallol ring may not rotate around that bond and remain in their original positions with respect to the bond as the compound is assembled.
groups include methyl, phenyl and trifluoropropyl.
2,6-diethyl-1,3,5,7-tetramethyl substituted BODIPY derivatives with methyl, propyl, pentyl and decyl substituents
at the meso position have been reported (Nagi et al.
and methylene protons, respectively: and [DELTA][zeta] is the protonational chemical shift increase of the substituent
Log P estimates the logarithmic octanol-water partition coefficient, therefore the Log P represents the lipophilic effects of a molecule which includes the sum of the lipophiliccontributions of the parent molecule and its substituent
The inhibitory effects of these HAQs might be related with the type and number of substituent
groups on the molecular structure, and the stability and solubility of the particular compound.
In other cases, an adversarial substance may be an environmental substituent
whose profile of toxicity plus occurrence is far less threatening than the effect of a more prevalent substance that merely has the good fortune of not being associated with a politically convenient target, such as a military-industrial enterprise.
An interesting feature of the tetrahydroisoquinoline alkaloids of peyote is the existence of a methylenedioxy substituent
on the aromatic ring, in contrast to the three methoxy groups in mescaline.
In the search for new fluorogenic reagents with benzofurazan structure along with an additional reactivity-enhancing substituent
to improve reactivity, we synthesized ammonium 5-bromo-7-fluorobenzo-2-oxa-1,3diazole-4-sulfonate (SBD-BF) and characterized this reagent by means of spectroscopic and analytical data.