ライフサイエンスコーパス: helicene

1 a major method for producing small amount of helicenes.

2 the chloro- and methoxy-substituted diaza[5]helicenes.

3 ger computed tensor elements than the chiral helicenes.

4 lectron delocalization for this series of [7]helicenes.

5 ding block for long [n]helicenes and oligo[7]helicenes.

6 Molecular structures of racemic [7]helicene 1 and its benzodithiophene building block 2 are

7 The functionalized, enantiomerically pure [7]helicene 1 derived from bis(benzodithiophene) functional

8 [7]Helicene 1 possesses a moderately increased electron del

9 ed to develop a novel set of photoresponsive helicenes 2-4 that lead to colored intermediates exhibit

10 Enantiopure helicene 3, either without solvent or in dodecane (but n

11 ion in a series of thiophene-based dibromo[7]helicenes (4-6) with different helix structures is inves

12 tric, polyaromatic hydrocarbons and their [5]helicene, [6]helicene, and [7]helicene isomers.

13 However, in the case of aza[9]helicene, along with the expected angular-angular cycliz

14 elective reactions and methods for producing helicenes, along with their functionalization.

15 o new compounds such as 3,11-di-tert-butyl[4]helicene and 1,8,9-perinaphthothioxanthene.

16 pared to those of analogous carbon-sulfur [7]helicene and [7]helicenes derived from benzodithiophene

17 Synthesis and study of aza[7]helicene and aza[9]helicene is presented in this paper.

18 Racemic [7]helicene and four other macrocyclic products of the anne

19 is an attractive building block for long [n]helicenes and oligo[7]helicenes.

20 Utilizations of non-racemic helicenes and their applications will be treated in the

21 nantiopure fully aromatic [5]-, [6]-, and [7]helicenes and their functionalized derivatives.

22 matic hydrocarbons and their [5]helicene, [6]helicene, and [7]helicene isomers.

23 a stilbene photocyclization to construct the helicene, and a Stille coupling to incorporate the DMAP

24 ension to a nonphotochemical synthesis of [n]helicenes, and the ease of isolation of the products are

25 rotation, and cyclic voltammetry) of the [7]helicene are described.

26 Alternatively, enantiomers of the [7]helicene are obtained via resolution using menthol-based

27 reactions that differentiate the ends of the helicenes are also described.

28 Cationic triangulenes and helicenes are highly stable carbocations with planar and

29 delocalization of the spin density over the helicene backbone.

30 ched with this proof-of-concept single-layer helicene-based device is sufficient to provide real-worl

31 rs allow the achievement of the first purely helicene-based redox-triggered chiroptical switches.

32 s studied for the enantiopure 6,13-dicyano[7]helicene building block.

33 es were originally reported for making lower helicenes, but for many years, photochemical synthesis h

34 try was obtained starting from 7,8-dibromo[5]helicene by Yamamoto nickel(0) couplings.

35 n to this problem present since the birth of helicene chemistry in 1956 by developing a general synth

36 Helicene chemistry is being considered as an expanding a

37 Helicene chemistry is now at a developmental stage, wher

38 ytic systems has promoted the development of helicene chemistry, toward a library of tailor-made and

39 f analogous carbon-sulfur [7]helicene and [7]helicenes derived from benzodithiophene to provide a cor

40 We report two new helicenes derived from the double fusion of an acene wit

41 The configuration of the diaza[6]helicene diastereomers was demonstrated by time-dependen

42 eview on the preparations of enantioenriched helicenes, either from an asymmetric synthesis or from a

43 ble chiral induction strategy with dimenthyl helicene esters synthesized in a 70:30 ratio of isomers

44 on, in which one benzene ring is fused to [5]helicene, forming a phenalenyl subunit.

45 products where the formation of multiple [6]helicene fragments is avoided by the formation of unusua

46 The helicene framework was specifically utilized to position

47 the (P) configuration and toward it when the helicene has the (M) configuration.

48 ons point away from the ring system when the helicene has the (P) configuration and toward it when th

49 Diversely functionalized diaza[5]helicenes have been synthesized starting from 6,9-dichlo

50 These PDI-helicene homologs exhibit very different structural and

51 em benzannulations to give substituted aza[5]helicenes in 82-83% yield.

52 th bromines at the terminal positions of the helicene inner rim and multiple solubilizing alkyl group

53 Racemic synthesis of [7]helicene is based upon iterative alternation of two step

54 The [7]helicene is configurationally stable at room temperature

55 thesis and study of aza[7]helicene and aza[9]helicene is presented in this paper.

56 space electronic delocalization when the PDI-helicene is reduced.

57 A new approach to fused helicenes is reported, where varied substituents are rea

58 s and their [5]helicene, [6]helicene, and [7]helicene isomers.

59 nonhollow supramolecular and macromolecular helicene-like architectures.

60 t dyes combine a cationic hemicyanine with a helicene-like motif to form a new blueprint for chiral s

61 Such [7]helicenes may be viewed as fragments of the unprecedente

62 An efficient synthetic route to fuse [5]helicene moieties around the phthalocyanine core is repo

63 and theoretical techniques reveals that the helicene moiety is a noninnocent ligand bearing a signif

64 The helicene moiety was constructed by the Diels-Alder react

65 The combination of a bis-alkynyl-helicene moiety with two iron centers leads to novel ele

66 ism (FDCD) from single (bridgedtriarylamine) helicene molecules by using an excitation wavelength (45

67 ary of tailor-made and highly functionalized helicene molecules.

68 in the helical carbenic ligand and efficient helicene-NHC-Ir interaction.

69 characterization of enantiomerically pure [6]helicene o-quinones (P)-(+)-1 and (M)-(-)-1 and their ap

70 A gallamide-containing pseudoenantiomeric helicene pair bearing a (10R,11R)-dimethoxymethyldibenzo

71 The new helicenes possess low racemization barriers, as demonstr

72 One of the solvent polymorphs of the [7]helicene possesses pi-stacked columns of opposite enanti

73 genation successfully transformed the double helicene precursor 2, i.e., 12a,26a-dibora-12,13,26,27-t

74 olism of 1 was due to formation of the azoxy-helicene product, pyrido[3,2-f]quinolino[6,5-c]cinnoline

75 For instance, the resolution of some helicene racemates by "hand picking" of a few homochiral

76 licenol triflates add to another ring of the helicenes rather than to an external furan molecule.

77 hile the topology and stereochemistry of the helicene remain unchanged.

78 e leading to sterically less demanding aza[7]helicene resulted in smooth reaction, and only the desir

79 ucing metal-vinyl ruthenium moieties onto [6]helicene results in a significant enhancement of the chi

80 The solid-state structures of these helicenes show a tendency for pi-stacking interactions i

81 The helicene skeleton was substituted by a variety of O-, S-

82 x-step one pot procedure that constructs the helicene skeleton), and because chromatography is not re

83 terochiral interaction between the different helicene species, suppressing the formation of the pure

84 Such [7]helicene structure, functionalized with bromines at the

85 ed bistetracene revealed a twisted double [5]helicene structure, indicating that this synthesis is ap

86 d to access a selenophene-annulated expanded helicene that, in contrast to its benzannulated analogue

87 zoquinone make it easy to prepare nonracemic helicenes that are substituted by hydroxyl groups at the

88 access to several members of a new class of helicenes, the "expanded helicenes", which are composed

89 y chiral polyaromatics represented by iconic helicenes, their availability in an optically pure form

90 rovides quasi-[8]circulenes for all three [7]helicenes, though only 4 gives a good isolated yield.

91 The helicenes undergo excellent complementary photoswitching

92 AH) embedding six enantiomerically stable [5]helicene units.

93 preferential crystallization of this chiral helicene-viologen hybrid has been established to obtain

94 In this case, the helical compound aza[9]helicene was predominantly formed at lower concentration

95 The generation of a chiral helicity in helicenes was observed because of a severe intramolecula

96 n the present study, carbazole-based diaza[6]helicenes were synthesized utilizing versatile quinoline

97 eparation of a novel substituted tetrathia[7]helicene where three new C-C bonds were formed in a one-

98 s of a new class of helicenes, the "expanded helicenes", which are composed of alternating linearly a

99 ized starting from 6,9-dichloro-5,10-diaza[5]helicene, which was prepared from a readily available qu

100 en combined with methanolic HCl gives the [7]helicene whose peripheral side chains are all methoxyls

101 the thiophene rings are annelated into a [7]helicene with cross-conjugated pi-system, are described.

102 erties are similar to those for analogous [7]helicenes with relatively lower electron delocalization,