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1 F/SbF5 through a superelectrophilic ammonium-carbenium activation process.
2 [5](+)) decorated at its peri-positions by a carbenium and a boryl unit separated by a B-C distance o
3 ium ylides 1(a-d) with several pi-conjugated carbenium and iminium ions have been investigated.
4 SO2 and makes a normally unreactive tertiary carbenium carbon susceptible to addition.
5 miliar trend based on electron demand at the carbenium center.
6                                          The carbenium formation and polyethylene chain variation was
7 computational studies, we show that the M->C(carbenium) interaction present in these complexes scales
8 ing due to the likelihood involvement of the carbenium intermediate that renders the stereochemical c
9  nature of the molten salts to stabilize the carbenium intermediates.
10                The 1,3-dimethylcyclopentenyl carbenium ion (C7H11(+)) was reproducibly prepared on ze
11                            Herein, a helical carbenium ion (N,N'-di-n-propyl-1,13-dimethoxyquinacridi
12 rly transfer its hydride to the intermediate carbenium ion (stabilized in the form of a cationic thio
13                    Bridged fluoronium ion 1, carbenium ion 2, and fluorocarbenium ion 3 were found to
14 dition sites (X-CH=CH2; X = CHO, NO2), eight carbenium ion acceptors, fulvene, borane, and SiH3(+) we
15 h, upon activation, dissociates generating a carbenium ion and dihydrocinnamic acid, or rearranges to
16 ectrophilic and extremely reactive secondary carbenium ion can be isolated in a neutral, nucleophilic
17 lecular attack of tetracoordinate carbons on carbenium ion centers were located; in some cases, such
18 e formation of the energetically most stable carbenium ion conformation, followed by the cyclization
19  evidence of the intervention of a secondary carbenium ion in the reaction path.
20        The reaction likely involves an allyl carbenium ion intermediate in which the adjacent stereoc
21 that: (1) the reaction proceeds via a cyclic carbenium ion intermediate, (2) the relief of strain in
22 azole phosphate fragments, consistent with a carbenium ion intermediate.
23 stablish a polar environment that stabilizes carbenium ion intermediates and catalyzes hydride transf
24                                The resulting carbenium ion is likely to be further stabilized by prot
25 , where cyclization of the indole-stabilized carbenium ion is slower.
26 tensions of our recently developed theory of carbenium ion stability in zeolites.
27 obile pentene phase and in production of the carbenium ion that reacts with the mobile pentene.
28 r loading, a proton was transferred from the carbenium ion to the base to leave 1,3-dimethylcyclopent
29 C bond followed by trapping of the resultant carbenium ion with boron-bound hydride.
30 rsatile organic photoredox catalyst (helical carbenium ion) for red-light-mediated photoredox reactio
31 (PA = 188 kcal/mol) does not deprotonate the carbenium ion, but these species do react as nucleophile
32 ted benzyl alcohol dehydration to a benzylic carbenium ion, followed by a hydride addition to form to
33 at the reactive electrophile, the cyclohexyl carbenium ion, is directly formed in a protonation step
34  dimers dehydrate without the formation of a carbenium ion, which would otherwise have contributed to
35 lication of related clock reactions in other carbenium ion-based branches of organic synthesis is con
36 g cracking are rapidly incorporated into the carbenium ion-mediated alkylation cycle.
37 rption of cyclohexene and the formation of a carbenium ion.
38 lefin and the transfer of the hydride to the carbenium ion.
39 dged, dicationic, protonated tetrahydrofuran-carbenium ion.
40 ts of the reaction originate from a tertiary carbenium ion.
41 nd functionalized at the gamma position by a carbenium ion.
42          We discuss four basic mechanisms: a carbenium-ion based mechanism taking place on acid sites
43 mpurities that might serve as initiators for carbenium-ion mechanisms, and the active catalyst was fr
44 vation barrier to form an alkoxy group via a carbenium-ion transition state.
45    Elimination involves E1 pathways and late carbenium-ion transition states.
46 f the alkene-like organic moiety at the late carbenium-ion-type transition states involved.
47                   The relative reactivity of carbenium ions (methyl > ethyl > iso-propyl > tert-butyl
48 uted carbenes (X-CH, singlets and triplets), carbenium ions (X-CH2(+)), and their hydrogen addition p
49                                          The carbenium ions activate the alkane polymer strands and a
50 philic addition of SO2, SO2ClF, and SO2F2 to carbenium ions and the nucleophilic addition of SO2 to 1
51 arily governed by the rates of initiation of carbenium ions and the subsequent intermolecular hydride
52 miniscent of the degenerate rearrangement of carbenium ions formed upon protonation of olefins.
53     A general method for generation of allyl carbenium ions from propargyl silanes via a 1,2-silyl sh
54   Cracking and alkylation are facilitated by carbenium ions initiated by AlCl(3)-tert-butyl chloride
55 oretical data for the addition of solvent to carbenium ions uniformly agree with experiments by Olah
56 emperature via hydride extraction to produce carbenium ions, (b) alkylate benzene without a Friedel-C
57                                          The carbenium ions, borane, and SiH3(+) gave not transition
58  DeltaH(ACID); hydride ion affinities of the carbenium ions, HIA; and enthalpies of hydrogenation of
59 r of stabilized aryl or heteroaryl(3-indolyl)carbenium ions, never previously prepared in the solid s
60 of cyclization and reduction of intermediate carbenium ions, where cyclization of the indole-stabiliz
61 Lewis adduct formation for iodonium ions and carbenium ions.
62 nd is demonstrated as a strategy to generate carbenium ions.
63 ction of a phosphine oxide Lewis base with a carbenium Lewis acid.
64  ; Xan=9-xanthylium) where the electrophilic carbenium moiety is juxtaposed with the metal atom.
65 ractions occur between the gold atom and the carbenium moiety of these complexes, the more Lewis acid
66                         We conclude that the carbenium moiety of this complex acts as a latent Z-type
67  through transition states much like primary carbenium (nitrenium, oxenium) cations, poorly conjugate
68 und is prepared in three steps from a simple carbenium precursor.
69 enium(V) complex to form an intermediate oxo-carbenium species able to react with proper soft nucleop
70 m revealing that the in situ generation of a carbenium species acts as an autocatalyst to prompt the
71 stituted pyrazoles through the generation of carbenium species from the reaction between aryl esters
72 o H(2)O(2), based on the use of redox-active carbenium species.
73 d ionic additions through generated reactive carbenium species.
74 n transition state and the product (benzylic carbenium), thus, lowering the free energy barrier of th
75 on centers were located; in some cases, such carbenium-to-carbonium rearrangement processes (in which