substituents In A Sentence
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- The presence of echo-substituents in diazo component which can form intermolecular hydrogen bond with imino group in the hydrozon form is in favour of the dyeing behaviors.
- As demonstrated by the variance in resultant mixtures, sterically demanding substituents alter a substrate' s relative tendency to rearrange through its preferred transition state.
- It further propose that the last step, protonation of a cyclohexadienyl anion, occurred ortho with respect to these substituents.
- "' Silanes "'refer to many compounds with four substituents on silicon, including an organosilicon compound.
- However, when the dienophile substituents are endo, there is considerable orbital overlap with the diene.
- "' Mesitylene "'or "'1, 3, 5-trimethylbenzene "'is a derivative of benzene with three methyl substituents positioned symmetrically around the ring.
- Heteroatom-containing substituents may direct metalation to the benzylic site closest to the heteroatom or increase the acidity of the ring carbons via an inductive effect.
- In atactic macromolecules the substituents are placed randomly along the chain.
- Other substituents, like methoxy and ethoxy, can even have opposite signs for the substituent constant as a result of opposing inductive and mesomeric effect.
- As is depicted in a Fischer projection of D-threose, the adjacent substituents will have a anti in the isomer referred to as " erythro ".
- Stereoisomerism about double bonds arises because rotation about the double bond is restricted, keeping the substituents fixed relative to each other.
- Thus substituents in the diene can significantly affect the rate of the reaction not only by their electronic character but by their influence on the relative proportions of the different conformers.
- There is an attempt to overcome resistance by the addition of derivatives and substituents to the vincristine molecule.
- With certain polar substituents, hydrogen bonding can occur in the allylic system between the substituents.
- Only alkyl and aryl substituents like methyl are electron-releasing in both respects.
- The process of apparicine dehydrogenation followed by oxidation with permanganate enables identification of the location of the two piperidine ring carbon substituents.
- It is " tert "-butyl substituents this compound is thermally stable.
- These substituents stabilize the negative charge on the carboxylate oxygen atom by an electron-withdrawing inductive effect (-I ) and also by a negative mesomeric effect (-M ).
- For sterically bulky substituents, even silanetriols have been prepared.
- Most structural changes, including replacing the " N "-methyl group with other substituents, abolished neurotoxicity.
- The acyl substituents of phospholipids provide the hydrophobic environment that is necessary for the function of intrinsic membrane proteins.
- They also found that introducing alkoxy substituents to the aluminum hydride decreases the reducing ability.
- For imidazolium salts, the C2 position may not need to be blocked if the nitrogen substituents ( N1 or N3 ) are sterically-demanding.
- Additionally, they noted the structural specifications, like stereochemistry, substituents of the reagents.
- For electron withdrawing groups the double bonds of the product avoid the substituents.
- The damage can include breakage of biopolymer chains, cross-linking of biopolymers, or chemical attachment of unnatural substituents ( haptens ) to biopolymers.
- Depending on the catalyst, some substituents can increase the rate of reaction.
- Substitution of hydrogen atoms by more electronegative substituents leads to radicals with a pyramidal geometry, such as the trifluoromethyl radical, CF 3.
- The reaction works well for methyl, benzyl, and phenyl substituents.
- The extraction behavior of dialkyl ( aryl ) Sulfides may be controlled by polar and steric substituents effects.
- The color of the dyes can be controlled selecting the number of azo-groups and various substituents.
- The third approach involves: 1) the synthesis of certain molecules containing readily polarised groups of substituents, and 2) the controlled polymerisation or crystallisation of these molecules.
- Only bonding with 4 equivalent substituents results in exactly hybridization.
- The functional group is also called a "'diazoamino group "'( but only one of the two substituents R 1 and R 3 may be hydrogen ) because it is related to a diazo group.
- All compounds only exhibit a nematic phase. Their mesomorphic properties and fluoro-substituents effect were studied in detail.
- Each phosphorus centre, which is pyramidal, bears three different substituents-anisyl, phenyl, and the ethylene group.
- Small aliphatic amines display significant solubility in many solvents, whereas those with large substituents are lipophilic.
- An unstable derivative with 4-alkyl substituents was reported in 1982.
- Moreover, the substituents on the bicyclic chromophore can also produce strong van der Waals and hydrophobic interactions with the residues located at the exterior part of the binding pocket.
- The logP of metformin is less than that of phenformin (-0.84 ) because two methyl substituents on metformin impart lesser lipophilicity than the larger phenylethyl side chain in phenformin.
- Variations in the substituents on the quinoline rings affect its luminescence properties.
- This treatment does not include ortho-substituents, which would introduce steric effects.
- Small molecular changes, such as substituents or ring flexibility can cause changes in the pharmacological and physiochemical properties of a drug.
- A study of doubly charged ion mass spectra (2E spectra), the substituents effect and the target gas pressure deppendence of biphenyl derivitives was presented in this work.
- In sufficiently high concentrations, imidogen polymerizes to form triazidine that, without stabilizing substituents, is in itself only a metastable molecule.
- Orientation of Substituent Groups.-The determination of the relative positions of the substituents in a benzene derivative constitutes an important factor in the general investigation of such compound
- Sulfur-containing substituents including linear thioether and sulfone, cyclic thiophene, thiadiazole and thianthrene are the most commonly used groups for increasing refractive index of a polymer.
- A representative reagent is Ioversol ( Figure to right ), which has water-solubilizing diol substituents.
- Unfortunately, substituents on the ring can react deleteriously with some of the most common catalysts.
- For methyl cinnamate, the two substituents ( Ph v . s.
- Some experimental and theoretical studies have been made to measure relative apicophilicities for various substituents.
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