How to use chiral in a sentence

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Sentence Examples Although chiral a-hydroxy aldehydes are interesting compounds, their synthesis from chiral cyanohydrins has always been difficult. Several attempts were made to analyze the sample by chiral chromatography but a single peak was always found. As with hands, chiral molecules can occur in two different forms, called enantiomers, which are mirror-images of one another. Recently, though, it was discovered that life itself can generate a particular enantiomer or chiral form of a particular molecule. One of the principal barriers to high yield is the creation of both enantiomers of a chiral compound, when only one is desired. The easiest way to tell whether a molecule is chiral or not is to try to superpose it on its mirror image. But what we learn in chemistry is that chiral objects cannot be distinguished by an achiral probe. The stereochemistry at each of its five chiral centres is pharmacologically critical. It has five chiral carbons and only the naturally occurring diastereoisomer is biologically active. Such isomers are called enantiomers and molecules that have enantiomers are said to be chiral or to show chirality. The second type is the cholesteric liquid crystal phase, also called the chiral nematic liquid crystal phase. Most alkaloids are also chiral molecules, meaning they have nonsuperimposable mirror images. A liquid crystal device is constituted by a chiral smectic liquid crystal to form a plurality of pixels. To break supersymmetry using the F-term, one can add chiral multiplets that transform as singlets under the gauge symmetries in the theory. Any object that is not superimposable onto its mirror image is chiral. The identity and enantiomeric purity of chiral starting materials and chiral reagents should be established. As a result, the demand for stereoselective analytical HPLC techniques to evaluate the enantiomeric purity of chiral compounds has increased. But related objects, a simple knife or a nail, for example, are superimposable on their mirror images and thus are not chiral. A compound containing two or more chiral centres, whose mirror images are superimposable because the molecule as a whole is symmetric. Also a new idea the so-called infrared regularisation, was proposed for treating heavy particles such as the nucleon in the chiral expansion. Show More Sentences In in flies we have seen examples of incorrect chiral type, incorrect rotation, symmetrical ommatidia, and ommatidia with an incorrect number of photoreceptor cells. The most common examples of chiral molecules are enantiomers. Possible preparation of other chiral intermediates or building blocks for pharmaceuticals and agrochemicals. Boehringer's patent also claimed both enantiomers of the chiral compound, but Boehringer had only guessed at which was the active form. Rhodia PPD announces the marketing of the chiral ligand Binap, and is rewarded with a Nobel Prize. In their chiral nematic states, the materials have a helical macrostructure which acts like a diffraction grating and selectively reflect light just like a compact disc does. The life sciences firm specialises in the niche area of chiral catalysis, which enables the production of pharmaceuticals with reduced side effects. Chirality in a molecule could be also induced, for example, by the presence of other quadrivalent chiral atoms, restricted rotation about single bonds, or by helicity. The enantiomeric excesses were determined by chiral HPLC with chiral column. To this suspension equimolar quantities of an aldehyde and a chiral amine are added successively, while stirring. Our results show that circular dichroism can be directly controlled using circularly polarised light, chiral order can be directly induced or switched. Cohen and coauthor Yiqiao Tang calculated that there are regions of space in which electromagnetic fields could be more chiral than in others. Unfortunately, particle physics predicts that any particle that has chirality cannot have mass, so a massive chiral fermion is a contradiction in terms. Like its amphetamine cousins, propylhexedrine is a chiral compound such that two stereoisomers are possible. Therefore, the phosphorus atom can act as a chiral center unlike a nitrogen atom. Furthermore, chemists often want to synthesize one of two possible mirror-image forms, or chiral molecules. Diastereoisomers may be chiral or achiral. The chiral efficiency of BINAP is a result of dissymmetric templates created by a transition metal atom and the C2 chiral diphosphine. This is accomplished by making the NMR signals for the protons of the enantiomers non-equivalent by the use of chiral lanthanide shift reagents, chiral solvating agents or chiral derivatizing agents. His group developed a new family of hydrogen bonding chiral guanidine catalysts, as well as a new class of highly reactive dienes for the Diels-Alder reaction. Show More Sentences The chiral nature of gold clusters influences the way they respond to circularly polarized light. Many types of molecules in living organisms, such as proteins and carbohydrates, are chiral, and medications and other important compounds often need to consist of one enantiomer and not its mirror image. The chiral compound is optically active 1-phenylethanol or 1-phenylethylamine. Enantiomers have identical physical and chemical properties except that they rotate the plane of polarized light in opposite directions and behave differently in a chiral environment. Esterases represent one of the most important classes of industrial biocatalysts due to their ability to catalyze stereospecific reactions and their importance in producing chiral intermediates. They have also been found useful as chiral auxiliaries, as inducers of enantioselectivity, and as fluorescence sensors. The macrocyclic antibiotic vancomycin has been used as a powerful chiral selector, specifically in capillary electrophoresis. The amino acids which were formed through prebiotic reactions were surely chiral. In the case of the latter, two chiral members, the snub cube and the snub dodecahedron, are realized. The conjugated arrangement of the CDZM maintains the resonant chiral properties of the conjugated gammadion structure, exhibiting two distinct fundamental resonances in the low frequency range. Unless an optically active agent is introduced or a separation into enantiomers deliberately performed, any chiral end products of the synthetic sequence will be racemic mixtures. In the case of substances whose molecule contains more than one chiral centre, all the diastereoisomers and their racemic pairs are controlled, unless specifically excepted by a decision of the Commission. Various enantiomers of the chiral compounds show different biological activities in the living systems during the medical and pharmaceutical processes. Its main field of expertise covers the development and production of heterocycles, boronic acids, amino acids, metal catalysts and chiral compounds. Wenzel describes chiral NMR derivatizing solvating agents, metal-based reagents and liquid crystals and explains the compounds for which they can be used for analysis. A privileged chiral ligand or catalyst is one that shows good enantioselectivity over a wide range of different reactions, due to its core structure. In the close vicinity of a chiral nanostructure, the circular dichroism of a biomolecule could be greatly enhanced, due to the interaction with the local superchiral fields. The authors cover general principles of this scientific discipline such as macrocyclic stereocontrol, chiral acetals, conjugate additions and carbonyl addition reactions. In particular, his group has developed new methods for the synthesis of planar chiral macrocycles and novel olefin metathesis catalysts for the formation of helicenes. This structure, called a chiral condensate, consists of quark-antiquark pairs, but only certain types of quarks pair up with certain types of antiquarks. Show More Sentences The major difference is that 3 utilized a chiral side group that contained 12 stereogenic centers that underwent multiple substitution reactions as it was being prepared. Examples from Classical Literature Snapper and his colleagues used their catalyst, which is chiral, on a compound with two alcohol groups in symmetrical positions on the molecule. Thus, optically active phosphines have been widely used as chiral ligands for transition metalcatalyzed asymmetric reactions. Polymer-immobilized chiral catalysts and reagents have received considerable attention in regard to the organic synthesis of optically active compounds. Find more words! 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Words that rhyme with chiral What is the adverb for chiral? What is the adjective for chiral? What is the noun for chiral? Use our Sentence Generator Nearby Words Chirac Chiquita chipset Chips chips chippy chirality Chiricahua Chirico chirimoya chirk chiro 6-letter Words Starting With c ch chi chir chira