ライフサイエンスコーパス: superacid

1 onstrated by the synthesis of a chiral Lewis superacid.

2 stitute for nonoxidizing strong protic acids/superacids.

3 he conjugate bases of known strong acids and superacids.

4 orm highly electrophilic systems in Bronsted superacids.

5 salts, as well as protosolvation of NO2+ by superacids.

6 CH horizontal lineC(X)CF3, X = F, Cl, Br] in superacids.

7 The mode of generation of Lewis superacids 6A and 6B allows an approximate comparison (o

8 observed, in triflatoboric acid, a powerful superacid, alkylation takes place, indicating protolytic

9 ts of two key players, a silicon-based Lewis superacid and a nucleophilic gold acetylide.

10 acationic electrophile has been generated in superacid and shown to undergo an arylation reaction wit

11 (FIA) confirms its classification as a Lewis superacid and the Gutmann-Beckett method as well as addu

12 -short SWNTs (US-SWNTs) in organic solvents, superacid and water is about 2 wt %.

13 mes the major limitations of presently known superacids and has potentially wide application.

14 The chemistry is most efficient in excess superacid, and it has been accomplished with aryl and al

15 notubes form true thermodynamic solutions in superacids, and report the full phase diagram, allowing

16 f triaryl methanols were ionized in Bronsted superacids, and the corresponding tricationic intermedia

17 tent image is captured when small amounts of superacid are generated by the photolysis of iodonium sa

18 ion, (CH3)3O+ with excess of 1:1 (2)HF/SbF5 superacid at -30 degreesC over a period of 30 days showe

19 The Lewis superacid, bis(1-methyl-ortho-carboranyl)borane, is rapi

20 The pioneering discovery of the use of superacids by George A. Olah, in the early 1960s, to cha

21 ew method for the generation of chiral Lewis superacids by protonation of a non-Lewis acidic oxazabor

22 This paper describes the superacid-catalyzed chemistry of olefinic amines and rel

23 In superacid-catalyzed reactions with arenes, two competing

24 nitroalkenes with arenes and nitriles in the superacid CF(3)SO(3)H (TfOH) results in the formation of

25 ted heterocycles are reacted in the Bronsted superacid CF(3)SO(3)H (triflic acid), and products are o

26 tituted superelectrophiles were generated in superacid (CF(3)SO(3)H), and their chemistry was examine

27 trifluoromethyl-alkyl)thiophenes in Bronsted superacids (CF(3)SO(3)H, FSO(3)H) gave rise to short-liv

28 zene in good yields (74-96%) in the Bronsted superacid, CF(3)SO(3)H (triflic acid).

29 In synthetic studies, the Bronsted superacid CF3SO3H is found to be an effective acid catal

30 ated 1,5-diarylpent-2-en-4-yn-1-ones add the superacid CF3SO3H to the acetylenic bond with formation

31 hydes and ketone with arenes in the Bronsted superacid CF3SO3H.

32 ne) were found to be extreme examples in the superacid class.

33 the properties of these glycosyl cations in superacid closely resemble those within the active sites

34 Phenanthrene is nearly inert to the same superacid conditions.

35 Compared to weaker Bronsted acids, the superacid consistently provides better yields along with

36 Superacids, defined as acids with a Hammett acidity func

37 The advent of molecular Bronsted superacids derived from weakly coordinating, redox-inact

38 s CO2 while traditional mixed Lewis/Bronsted superacids do not.

39 uoroterephthalonitrile (TFPN) over the Lewis superacids, e.g., zinc triflimide [Zn(NTf(2) )(2) ] with

40 In this study, we exploit a superacid environment to generate, accumulate, and fully

41 ne, and hexamethylbenzene with the carborane superacid H(CB(11)HR(5)X(6)) (R = H, Me; X = Cl, Br).

42 es of protonation studies using the Bronsted superacid H(CHB(11)Cl(11)) both in the solid state and i

43 The carborane superacid H(CHB11 F11 ) is that acid.

44 A new superacid, H(CB11H6X6) (where X = chlorine or bromine),

45 shows how applications of molecular Bronsted superacids have advanced from stoichiometric reactions t

46 The reaction of Fe(CO)(5) with the superacid HF/AsF(5) leads to the protonation of the iron

47 and fluorinated arylamines was performed in superacid HF/SbF5 through a superelectrophilic ammonium-

48 dimethyl nitramine with anhydrous HF and the superacids HF/MF5 (M=As, Sb) were investigated at temper

49 erated by the reaction of CO with the liquid superacid hydrofluoric acid-antimony pentafluoride (HF-S

50 red the applications of this newly available superacid in catalysis.

51 nd their further transformations promoted by superacid in the same pot.

52 rane (BoCb(3) ), a single site neutral Lewis superacid, in one pot from commercially available materi

53 r structures and properties, for example, in superacids, in salts, or in the gas phase.

54 The superacid is particularly effective when dicationic elec

55 At low SWNT concentration (below 200 ppm) in superacids, light absorbance in the range from 400 to 14

56 een the stabilizing effect of counterions in superacid media and the network of multidentate noncoval

57 ated at the cyano groups (1H2 2+) in various superacid media.

58 reactivity of electrophilic intermediates in superacid media.

59 diprotonated dications in CF(3)SO(3)H-SbF(5) superacid medium.

60 t are typical of common, difficult-to-handle superacid mixtures?

61 infrared spectra are difficult to obtain in superacids or salts (where furthermore the cations may b

62 The H(CB11H6X6) superacid overcomes the major limitations of presently k

63 Safer, less-reactive superacid processing enables printing and coating of car

64 In this Note, we describe superacid-promoted cyclodehydrations leading to function

65 ols are shown to be excellent substrates for superacid-promoted Friedel-Crafts reactions.

66 The superacid-promoted reactions of alpha-hydroxy and alpha-

67 The superacid-promoted reactions of vinyl-substituted N-hete

68 assumed to react with light alkanes through superacid protonolysis, which results in carbocation int

69 furic acid that could potentially outcompete superacid protonolysis.

70 repared and ionization of these compounds in superacid provided superelectrophilic species.

71 ion H0 </= -14.5 and is thus identified as a superacid, providing the first evidence for superacidity

72 sms akin to transition metals and outcompete superacid reactivity.

73 has never been reported because of presumed superacid reactivity.

74 renium ionic liquids are the strongest Lewis superacids reported to date, with the acidity enhanced b

75 ons, an equilibrium involving the 1 and 2 in superacid solutions is most likely responsible for the e

76 Quenching of the superacid solutions of the dications resulted in the for

77 ined in a 3:2 or 3:1 ratio, depending on the superacid system.

78 [Ar-C=C-C(CF(3))(OSiMe(3))-CH=CH-Ar'] in the superacid TfOH give rise to reactive conjugated CF(3)-al

79 [Ar-C C-C(CF(3))(OSiMe(3))-CH CH-Ar'] in the superacid TfOH give rise to reactive conjugated CF(3)-al

80 CH=CH-CO(2)H) reacts with arenes in Bronsted superacid TfOH, affording the aromatic acylation product

81 of chloroethane by the strongest known solid superacid, the carborane acid H(CHB(11)Cl(11)), has been

82 Compound 2 undergoes ring opening in the superacid to give the ipso-monoprotonated 2H+, which on

83 The failure of traditional mixed superacids to protonate weak bases such as CO2 can be tr

84 Here, we show that a superacid treatment, previously shown to enhance the pho

85 r Friedel-Crafts reaction using the Bronsted superacid, triflic acid (CF(3)SO(3)H).

86 The superacid trifluoromethanesulfonic acid (TfOH), 1 M in d

87 We show here that the superacid trifluoromethanesulfonic acid (TfOH), ca. 1 M

88 ution-based chemical treatment by an organic superacid, which uniformly enhances the photoluminescenc

89 d by low-temperature NMR spectroscopy in the superacids, which shed light on their reactivity and rea

90 Reaction of this superacid with C60 gives HC60+ as a stable ion in soluti