ライフサイエンスコーパス: azulene

1 upling through nonalternant n-systems (e.g., azulene).

2 florisil to give excellent yields of calix[4]azulene.

3 eral synthetic route to 1,3,6-trisubstituted azulenes.

4 yrolyses using (13)C- or substituent-labeled azulenes.

5 (1-azulenyl)tetrazole and the sodium salt of azulene-1-carbaldehyde tosylhydrazone using the falling

6 formation of naphthalene-d(0) and -d(2) from azulene-4-d.

7 titatively for all the products from 1-(13)C-azulene, 9-(13)C-azulene, and 4,7-(13)C(2)-azulene, in a

8 rization of 1,2,3,8a,9-pentahydrocyclopent[a]azulene-9,9-dicarbonitrile through complete active space

9 Azulene, a blue structural isomer of naphthalene, is int

10 d by reacting an indene-derived enamine with azulene aldehydes in the presence of Bu(2)BOTf, and azul

11 Recently, azulene analogs have been used in optical technology.

12 sis of novel, unparalleled diaza-dibenzo[a,e]azulene and diaza-benzo[a]fluorene derivatives has been

13 Rearrangement of azulene and generation of benzyne from phthalic anhydrid

14 el reveals that the anti-Kasha properties of azulene and its derivatives result from (i) the contrast

15 le mechanisms of the experimentally observed azulene and naphthalene automerizations.

16 obtained with substituted and (13)C-labeled azulenes and benzazulenes.

17 activation energies (>/=350 kJ mol(-1) from azulene) and so can only be competitive at temperatures

18 l the products from 1-(13)C-azulene, 9-(13)C-azulene, and 4,7-(13)C(2)-azulene, in addition to accoun

19 Although fully unsaturated azulenes are formed as byproducts during the synthesis o

20 Furthermore, thermal azulene-azulene isomerization is feasible through vinyli

21 d to selectively obtain 4- and 5-substituted azulenes based on the nature of bases and nucleophiles e

22 ies of an archetypal anti-Kasha fluorophore, azulene, based on its ground- and excited-state (anti)ar

23 -[1,1'-biazulene] motif (serving as a unique azulene-based surrogate of the ubiquitous BINOL moiety)

24 Novel azulene building blocks, prepared via the cycloaddition

25 y be readily prepared from the corresponding azulenes by an SE Ar reaction.

26 synthesis of aryl-substituted naphtho[2,1-a]azulenes by the combination of Suzuki-Miyaura, Sonogashi

27 reducing the formation of fully unsaturated azulene byproducts.

28 The substituted azulenes can be converted into dialdehydes under Vilsmei

29 erium exchange also occurred at the internal azulene CH as well as at the meso-positions with TFA-d.

30 differences in exchange coupling mediated by azulene compared to exchange coupling mediated by altern

31 terojunction solar cells, where the relative azulene content affected the device metrics and the powe

32 d single-crystal analyses suggested a formal azulene core for 9, which showed a smaller highest occup

33 epending upon the attachment position on the azulene core.

34 tanding of aromaticity-into a cyclopenta[c,d]azulene (CPA) one in a chevron-like graphene nanoribbon

35 yrin framework with cyclopentadiene, indene, azulene, cycloheptatriene, or benzene, new families of p

36 nic behavior that depended critically on the azulene density along the polymer chain.

37 per repeat unit) to copolymers in which the azulene density was diluted with other pendant groups.

38 ic properties were realized by adjusting the azulene density, ranging from homopolymers (having one a

39 t-effective procedure for the preparation of azulene derivatives from 2-hydroxycyclohepta-2,4,6-trien

40 ical and electrochemical properties of these azulene derivatives was studied by experimental and theo

41 des a rationale for the preparation of novel azulene derivatives with improved properties for applica

42 The limit of detection for azulene derived from the aqueous sample was as low as ~1

43 aldehydes in the presence of Bu(2)BOTf, and azulene dialdehydes similarly reacted to give fulvene di

44 Bis(pyrrolylmethyl)azulene dialdehydes underwent intramolecular McMurry cou

45 nthrylene 8 was synthesized and converted to azulene-embedded 9, which is a tribenzo-fused non-altern

46 nsity, ranging from homopolymers (having one azulene group per repeat unit) to copolymers in which th

47 nyl-1-buten-3-ynes from flash thermolysis of azulene has an activation energy of 360 kJ mol(-1); subt

48 Azulene has been recognized for its application in medic

49 The mechanism(s) of thermal rearrangement of azulenes have been enigmatic for several decades.

50 e, naphthalene, anthracene, anthanthrene, or azulene hearts.

51 he graphite-sensitized microwave reaction of azulene in the solid phase at temperatures of 100 to 300

52 C-azulene, 9-(13)C-azulene, and 4,7-(13)C(2)-azulene, in addition to accounting for the products from

53 o several different classes of 1-substituted azulenes, including a conjugated ketone and a fused tetr

54 A range of azulenes, including derivatives of naturally occurring g

55 The former azulene is obtained cleanly from the Cl(9) compound with

56 n on 3-substituted 2-methoxytropones to form azulenes is dependent on the nucleophile and base employ

57 n strategy" for the synthesis of substituted azulenes is described based on the reaction of beta'-bro

58 The azulene-like isomer 5 is the only species for which the

59 by free radical polymerization, in which the azulene moieties represent hydrophobic dipoles strung pe

60 Although the azulene moiety introduces an element of cross-conjugatio

61 The presence of a tert-butyl group on the azulene moiety slightly enhanced the diatropicity of the

62 ide; Az = azulene) that possess nonalternant azulene n-system bridges.

63 n energies lying below that required for the azulene-naphthalene conversion, i.e., the NVM.

64 caradiene-vinylidene mechanism (NVM) for the azulene-naphthalene rearrangement (E(a) ~ 76.5 (74.6) kc

65 ions for most of the products of the thermal azulene-naphthalene rearrangement.

66 orporation of the seven-membered ring of the azulene nucleus directly into the backbone of conjugated

67 In azulene, opposite shifts of the L(a) and L(b) states ari

68 5-oxo-1,3a,4,5,7,9-hexahydro-3H-cyclopenta[e]azulenes or their heteroatom congeners, in excellent yie

69 omerization is expected to take place during azulene pyrolysis, especially under conditions of low-pr

70 Alternatively, azulene reacted with acetoxymethylpyrroles (2 equiv) in

71 Azulene reacts with paraformaldehyde in the presence of

72 ctron-donating or -withdrawing groups on the azulene ring.

73 The azulenes, serving as colored hydrocarbon backbones of mi

74 a-ethano-indene and 1,8a-dihydro-1,3a-ethano-azulene skeletons from suitable propargyl vinyl ethers i

75 We report the synthesis of novel azulene-substituted methacrylate polymers by free radica

76 an electron-donating tert-butyl group on the azulene subunit increases the macrocyclic diatropicity.

77 usual pyrrole rings has been replaced by an azulene subunit.

78 icarbaporphyrinoids with adjacent indene and azulene subunits.

79 These azulene sulfonium salts are bench-stable species that ma

80 anion, NN = spin-1/2 nitronylnitroxide; Az = azulene) that possess nonalternant azulene n-system brid

81 promoted mechanisms for the rearrangement of azulene to naphthalene are assessed with the aid of dens

82 The thermal rearrangement of azulene to naphthalene has been the subject of several e

83 The macrocycle is near planar, and the azulene unit was only tilted out of the plane by 7.4 deg

84 The functionalization of azulenes via reaction with cationic eta(5)-iron carbonyl

85 Eucalyptol, phytol, and azulene were identified as the main compounds.

86 Substituted calix[4]azulenes were prepared by reacting 6-alkylazulenes with

87 [1,2-a]quinolines and 1,2a-diazadibenzo[cd,f]azulenes were prepared from a common intermediate by reg

88 hese include a benzene, a napthalene, and an azulene, where four C atoms are replaced by a pair of B

89 Hydride abstraction of a calix[4]azulene with Ph(3)CPF(6) afforded a tetraazulene analogu

90 Copolymers of azulene with zwitterionic methacrylates proved useful as

91 can be prepared by reacting the substituted azulenes with an acetoxymethylpyrrole in the presence of