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1 spite the fact that the Fe(4)S(4) cluster is achiral.
2 -(-) so that nonactin has S4 symmetry and is achiral.
3 ders the resulting bis-bispidine macrocycles achiral.
4 o asymmetric variant of the rearrangement of achiral 1,5-dienes has emerged, despite the successes th
6 2,2-trifluoro-1-methylethylamino group or an achiral 2,2,2-trifluoroethylamino group is required at t
7 xose was accomplished in 19 total steps from achiral 2-acylfuran, and digitoxin was fashioned in 15 s
9 ereocontrolling event, with the anion of the achiral acid being the structural element responsible fo
11 simplest possible combination of chiral and achiral active stresses, yet this leads to an unpreceden
13 actones bearing two stereogenic centers from achiral aldehydes (both aromatic and aliphatic) and alky
14 markably high levels of stereoinduction with achiral aldehydes, leading preferentially to 1,5-anti re
16 s, the compounds with six and ten carbons of achiral alkoxy side chains were further subjected to stu
19 gent catalysis is observed upon changing the achiral amino acid residue in the catalyst (at the i+2 p
21 over the screw sense of a helical 17-mer of achiral amino acids, Aib(8)GlyAib(8), from a single chir
22 synthesizes proteins using exclusively L- or achiral aminoacyl-tRNAs (aa-tRNAs), despite the presence
23 the two optically pure enantiomers and their achiral analog have nearly the same degree of cell prote
25 tion of an intermediate pyrazinone with both achiral and chiral acrylate-derived dienophiles provides
29 and repeatability were achieved by combining achiral and chiral narrow-bore columns (2.1 mm x 100 mm
30 hane-A cage for biosensor applications, some achiral and chiral substituents such as left-handed amin
32 hose bicyclopentane units can rotate but are achiral and produce no second-order optical response.
34 ated as a broad proof of concept for chiral, achiral, and HILIC separations of biologically important
35 ectively activate a mixture of two different achiral anhydrides as acyl donors under homogeneous cond
37 bly, the preferred helicity of the stacks of achiral AOPV3 can be retained almost completely after a
38 The racemic mixture of helical stacks of achiral AOPV3 molecules is converted into homochiral hel
40 ary to intuitive expectations, we utilize an achiral architecture to realize a chiral beam-splitting
42 ed and relies on the subtle influence of the achiral aryl imine substituent on the cobalt catalyst.
46 e-type carbonyls by SmI2-H2O, convert simple achiral barbiturates in one step to hemiaminal- or enami
47 , there is no reaction in the absence of the achiral base, yet the presence of the achiral co-catalys
50 The nanoporous host is itself an assembly of achiral, bent-core liquid crystal molecules that phase-s
51 o be transmitted from a chiral analyte to an achiral benzotriazole dye molecule in the vicinity of a
58 ive functioning of the chiral Lewis acid and achiral Bronsted base components gives rise to in situ e
59 ed by performing the same experiment with an achiral BTA ligand, i.e. a phosphine-functionalized BTA
60 one-pot organocatalytic process merging two achiral building blocks into an octacyclic structure via
61 lly pure chiral amines, starting from simple achiral building blocks, are highly desirable because su
62 ard achieving full saturation: chiral versus achiral building blocks, certain forms of conformational
63 Here we report a simple method to assemble achiral building blocks, i.e., the asymmetric colloidal
69 tes, in the presence of < or = 2 mol % of an achiral catalyst to afford synthetically versatile produ
70 stereoselective cycloisomerizations using an achiral catalyst, and then explore phosphoramidite-compl
71 ntioselective transformations at an embedded achiral catalytic center, as illustrated by the oxidativ
72 the use of a diverse assortment of embedded achiral catalytic centers, promising a generation of syn
73 lies formed by BTA Ile and the intrinsically achiral catalytic rhodium catalyst, providing the hydrog
74 r a chiral IL composed of a chiral anion and achiral cation toward another chiral molecule such as a
76 f catalytic asymmetric reactions and second, achiral chromatography can be used as a new, nonconventi
77 in this review clearly suggest that SDE via achiral chromatography might be expected for any given c
78 n is based on chirally perturbing the acting achiral chromophore by orthogonally tethering a single a
79 .g., those based on other highly luminescent achiral chromophores and/or chirally perturbing moieties
80 of the achiral base, yet the presence of the achiral co-catalyst gives rise to facile formation of pr
81 erintuitive strategy involving the use of an achiral co-catalyst structurally similar to the chiral c
84 und numbers without parentheses represent an achiral compound or a single enantiomer] by extension at
87 ion between petals in the cluster favors the achiral configuration, whereas out-of-plane attraction b
90 The obtained compounds can be considered as achiral conformationally restricted analogues of threoni
91 ns and rotatory strengths are calculated for achiral, conjugated hydrocarbons with the aim of determi
92 gen fiber, a conformation producing a strong achiral contribution to the second-order nonlinear effec
93 e is energetically unstable, with either the achiral conventional structure or a closed pore structur
96 to be less prone to polymorphism than their achiral counterparts and compounds able to hydrogen bond
97 of D- and L-aspartic acid are exposed to an achiral Cu(111) surface, a small e.e. in the gas phase,
98 on can minimize the deleterious influence of achiral Cu-alkyl species, resulting in improved enantiom
100 ctive Cu-H elimination may be avoided and/or achiral Cu-boryl intermediates can be converted to allyl
101 ic core of C3 symmetry, was synthesized from achiral [Cu20H11{S2P(OiPr)2}9] (1H) of C(3h) symmetry by
102 sm (CD) is observed from J-aggregates of the achiral cyanine dye in association with a random coil CM
104 ,4-3,5)nG2-CH2-Boc-L-Tyr-L-Ala-OMe and their achiral dendritic alcohol (4-3,4-3,5)nG2-CH2OH precursor
107 of an amine with an allene that furnished an achiral dihydropyrrole in 22% yield, we have developed,
108 ImmH (K*i(1/4) 5 pM, fourth-generation) uses achiral dihydroxyaminoalcohol seramide as the ribocation
110 ce, inducing a screw sense preference in the achiral domain of the maleamide-linked foldamers that is
111 ynthetic intermediates, including chiral and achiral drugs and metabolites, constitutional isomers, s
112 aphy on an achiral stationary phase using an achiral eluent, which leads to the substantial enantiome
113 mma-amino alcohols were produced from simple achiral enals in one flask by combining dienamine- and i
114 lic C6 carbon of HMMF, resulting in a cyclic achiral enolate intermediate that subsequently becomes p
117 d chromatography (HPLC)) and a topologically achiral figure eight knot (18% by HPLC), competing produ
118 e/maleamide linker to couple a chiral and an achiral fragment allows the change in hydrogen bond netw
121 ntiotopic-group-selective cross-couplings of achiral geminal bis(pinacolboronates) provide a route fo
122 ene synthase) for conversion of the acyclic, achiral geranylgeranyl diphosphate to the polycyclic, ch
124 control over the screw sense of an otherwise achiral helical peptide foldamer formed from the achiral
126 to the design of a new protocol in which an achiral hydrogen bond donor thiourea catalyst was utiliz
127 njugated to its hydrophilic part (RF-NBD) or achiral hydrogenated and a red fluorescent dye in its hy
128 in their hydrophobic part (RF), one contains achiral hydrogenated dendrons (RH), while one denoted hy
129 ombination of chiral-racemic fluorinated and achiral hydrogenated dendrons (RHF) in its hydrophobic p
131 As shown previously, oligomers derived from achiral imidazole amino acids fold into canonical helice
132 at the plasmonic and excitonic resonances of achiral inorganic nanocrystals (NCs) capped and/or forme
133 on between orthogonal DNA enantiomers via an achiral intermediary, opening the door for "heterochiral
134 antiomers interconvert (racemize) through an achiral intermediate involving a slight rotation of the
135 Interconversion presumably occurs via an achiral intermediate, either a rapidly inverting (via an
136 servation that the ordering exhibited by the achiral LCs is specific to the enantiomers used to form
141 ved from a combination of one chiral and one achiral ligand, where a synergistic interaction of the t
142 catalyst is introduced which contains solely achiral ligands and acquires its chirality entirely from
143 edral iridium(III) complex exclusively bears achiral ligands and effectively catalyzes the enantiosel
145 bstituted 1,3-dienes give almost exclusively achiral linear 1,4-addition products, unless the 2-posit
147 nt and induce a helical superstructure in an achiral liquid crystal host but also to be able to rever
148 When doped into a commercially available achiral liquid crystal host, the chiral switch was able
152 nable helical superstructure or to retain an achiral liquid-crystal phase whose helical superstructur
153 from right-handed to left-handed through an achiral liquid-crystal phase, whereas its reverse proces
154 taining different combinations of chiral and achiral macrocycle and axle components, the dominant inf
155 way in which handedness is transmitted into achiral materials is not yet understood at the atomic le
156 preference may furthermore be induced in the achiral, meso oligoureas by formation of a 1:1 hydrogen-
157 e, we study a metasurface composed of tilted achiral meta-atoms with no spatial variation of the unit
158 , supramolecular helical rods composed of an achiral metal complex and a complementary enantiopure mo
160 rstanding of the chiroptical interactions in achiral metasurfaces, our work opens up new perspectives
161 rough diastereoselective reactions involving achiral Mo-based bispyrrolides and enantiomerically pure
162 es, and of prochiral molecules on chiral and achiral model surfaces, especially on well-defined metal
170 icomponent supramolecular networks formed by achiral molecules at the interface of a chiral solvent a
171 of LCs on surfaces presenting chiral versus achiral molecules provide insights into the molecular or
172 r knowledge, 20g and 23g represent the first achiral molecules that modulate selectively hUII and URP
174 y demonstrate a new nematic order, formed by achiral molecules, in which the director follows an obli
178 ctural design to achieve CPL from inherently achiral monochromophore systems in simple organic molecu
180 reaction cascade leading from two identical achiral monomers to homodimericin A is presented, and ho
181 amounts of axially chiral phosphoric acids, achiral N,N'-binaphthyl hydrazines undergo a facile [3,3
182 o catalyze the oxidative desymmetrization of achiral N,N-dialkyl piperidine-4-carboxylates to give pr
184 tic kinetic resolution of cyclic amines with achiral N-heterocyclic carbenes and chiral hydroxamic ac
189 reactions with the less sterically demanding achiral NHCs, the presence of MeOH is required for high
192 nucleobase-peptide conjugates (NPCs), where achiral nucleobases are helically displayed on the surfa
193 lysis approach, namely the combination of an achiral nucleophilic catalyst and a chiral anion-binding
194 -butylphosphine was found to be an effective achiral nucleophilic catalyst, effecting good yield and
195 nction in concert such that one serves as an achiral nucleophilic promoter and the other performs as
197 -(+)-herbertene by asymmetric cyclization of achiral olefinic alkyllithium precursors in the presence
199 dimensional helical self-assembled stacks of achiral oligo(p-phenylenevinylene) ureidotriazine (AOPV3
202 acyclic quaternary carbon stereocenters from achiral or chiral racemic reactants via transition metal
205 and a chromophoric, CD-silent probe that is achiral or exists as a racemic mixture of rapidly interc
206 talytic enantioselective desymmetrisation of achiral or meso compounds is a powerful strategy for the
207 ic redox-relay oxidative Heck reaction using achiral or racemic acyclic alkenols and boronic acid der
210 umerical simulations result in defect-ridden achiral patterns, containing domains of either hand, due
211 mers of alpha-aminoisobutyric acid (Aib) are achiral peptides that typically adopt 310 helical confor
212 armacokinetic properties of a novel class of achiral peptidomimetic HCV NS3 protease inhibitors.
214 crowns substituted with chiral, racemic, or achiral peripheral alkyl chains, including enantiopure R
215 romic shift of fluorescence emission for the achiral perylene moiety as a chemical junction of the BC
217 anes to carbodiimides yields both chiral and achiral phosphaguanidine boranes under ambient temperatu
219 tunable helical superstructure or retain an achiral photoresponsive liquid crystal phase whose helic
220 chiral ((R)/(S)-BINOL, diethyl tartrate) and achiral (piperazine and trigol) linkers with varying ste
221 ess of intrinsically chiral NCs or arranging achiral plasmonic particles in chiral configurations.
222 ic molecules (tricyclic to pentacyclic) from achiral polyene precursors by enantioselective proton-in
223 erization of lactides starting from a single achiral precursor and the proper choice of an achiral si
224 on of key chiral intermediates from a simple achiral precursor, 2) the utility of a key 1,2-cyclobuta
225 ternatively, from the commercially available achiral precursor, monoprotected 1,4-cyclohexanedione.
228 talo- and manno- configurations from simple achiral precursors through organocatalytic asymmetric in
229 bserved that conglomerate crystallization of achiral precursors yielding racemate metal organic frame
236 ension of this methodology from the study of achiral pyridine-based catalysis to chiral peptide-based
240 ly simple system of hard Brownian particles: achiral regular triangles confined to two dimensions.
242 ical rods are formed upon co-assembly of the achiral rhodium complex of BTA(PPh2) and the enantiopure
243 ross-metathesis (DROCM) reactions, involving achiral Ru catalysts and enantiomerically enriched allyl
245 her hand, polynuclear complexes based on the achiral [Ru(2,2':6',2''-terpyridine)2](2+) motif are eas
246 tum yield, as well as chiral transfer to the achiral segment of the fluorescent peptide amphiphile.
248 pped at the inlet of a (4)D column, on which achiral separation allows precise quantification of each
249 eparations are performed, the first being an achiral separation followed by a chiral separation of a
252 glutathionyl-alpha-veratrylethanone) from an achiral side chain-truncated model substrate (beta-guaia
262 compounds, subjected to chromatography on an achiral stationary phase using an achiral eluent, which
263 ce of a two-catalyst system consisting of an achiral strong Bronsted acid (o-nitrobenzenesulfonic aci
264 nsic or pseudo-chiral (meta)surfaces have an achiral structure, yet they can give rise to circular di
265 d method can discriminate between chiral and achiral structures regardless of their orientation.
267 e polybinaphthyls have been synthesized from achiral substrates by asymmetric oxidative phenolic coup
268 ions are mostly highly enantioselective with achiral substrates, and due to the accelerated nature of
271 feasibility of asymmetric sulfinylations by achiral sulfinylating agents (from the perspective of Al
272 uid chromatography (UHPLC), core shell HPLC, achiral supercritical fluid chromatography (SFC) and chi
275 used to resolve thymidine enantiomers at an achiral surface with an OPV3T enantiomer as the resolvin
276 ane elasticity, geometrical frustration, and achiral symmetry breaking can be used to fold colloidal
277 As the concentration is lowered, breaking of achiral symmetry in the director configuration is observ
280 eration vibrational spectroscopy; chiral and achiral tensor elements were separated using different i
286 ted by a dual catalyst system composed of an achiral thiourea and a chiral primary aminothiourea.
288 nal groups--those that can be converted from achiral to chiral in a single step--that are accessible
289 crete catalysts--a chiral nucleophile and an achiral transition metal complex working in tandem.
290 key catalytic ring-closing metathesis of an achiral triene is used to establish the all-carbon quate
294 the interface: energetic preference towards achiral versus the faster growth kinetics of chiral nano
295 ganizationally chiral domains even when R is achiral, while adatom binding leads to rectangular plane
296 ) nanoparticles (Fe NPs) functionalized with achiral (with 1) and chiral (with 2) PNNP-type tetradent
298 the above system is that the precursors are achiral; yet, the tubules are formed from helical ribbon
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