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1 is stabilized by becoming an aluminum oxygen pi bond.
2 g the sterically bulky NR(2) over the alkene pi bond.
3 CC bond, and an in-plane alkyne (or alkene) pi bond.
4 tion among the three, has the strongest Fe-O pi-bond.
5 o-substituted furan across a tethered indole pi-bond.
6 dipolar cycloaddition across the neighboring pi-bond.
7 s well as cyclopropanation across a tethered pi-bond.
8 of the rhodium carbenoid across the aromatic pi-bond.
9 nt [4 + 2]-cycloaddition across the tethered pi-bond.
10 ile) to form a new product with a transposed pi-bond.
11 referred protonation reaction at the enamine pi-bond.
12 nd benzene, the latter with the formation of pi bonds.
13 distinct pathway to the thioboration of C-C pi bonds.
14 ized three-, four-, or five-center sigma and pi bonds.
15 of a conjugated chain of C horizontal lineC pi bonds.
16 e moieties through Ru horizontal linecarbene pi bonds.
17 ns from cyclopropanes and C horizontal lineO pi bonds.
18 to carbonyls, imines, and related polarized pi bonds.
19 um nanoparticle surface by ruthenium-carbene pi bonds.
20 racterized by their strong and covalent Fe-O pi-bonds.
21 onbridging carbon atoms remain unpaired with pi-bonds.
22 tructures of transition metal complexes with pi-bonds.
23 h carbon p orbitals in the formation of ring pi-bonds.
24 gh remote protonation of the pyrrole gamma-C pi-bonds.
25 of cation-pi interactions involving olefinic pi-bonds.
26 depend on whether the ligands are sigma- or pi-bonded.
27 azolyl ligand substituents on Fe-L sigma and pi bonding.
28 rpreted in terms of CH-pi, pi-pi, and cation-pi bonding.
29 s associated either with the mobilization of pi-bonded 2-pentene or with the equally large activation
30 of an endo cycloaddition of the neighboring pi-bond across the transient thioisomunchnone dipole.
31 he discussion is classified according to the pi-bonds activated by gold(i), in an order of alkynes, a
32 ne species PhICl(2), and catalyse a range of pi-bond activation reactions previously only catalysed t
33 from 5,6-dihydro-2'-deoxyuridin-6-yl involve pi-bond addition to or hydrogen atom abstraction from th
35 it triple pi aromaticity with 11 delocalized pi bonds, analogous to benzo(g,h,i)perylene (C22H12).
36 a-bonded arrays are compared to conventional pi-bonded analogues with respect to orbital symmetry and
37 ion conditions that include dewetting of the pi bond and an unsymmetrical perepoxide transition state
40 o the surface of a graphene electrode via pi-pi bonds and electrochemical reduction of graphene oxide
43 es place on the more nucleophilic enol ether pi-bond and the resulting carbonium ion undergoes a subs
44 from the large energy gap between the Fe-NO pi-bonding and antibonding molecular orbitals relative t
45 so present for dienes containing both alkene pi-bonds and allylic sigma-bonds, and the ene yields are
46 by a combination of electronic (weaker Fe=N pi-bonding) and thermodynamic (more exothermic HAT) effe
47 are strongly coupled by M(2) delta-to-bridge pi-bonding, and further coupled by direct M(2)...M(2) bo
49 -), H(2)B(8), and H(2)B(9)(-), each with two pi bonds, are similar to butadiene, while H(2)B(10)(2-),
54 another ten pi-electrons responsible for the pi-bonding between the central pentagonal unit and the o
56 nd) in both 1 and 2 owing to the significant pi-bonding between the vanadium and the oxide ligand.
57 nelastic scattering reveals that half of the pi-bonds between graphite layers convert to sigma-bonds,
58 xbiph) )Ir(phpy)(Cl)] (1-Cl), which contains pi-bonded biphenyltetramethylcyclopentadienyl (Cp(xbiph)
59 dified thiolate compensates for this loss of pi bonding by increasing its covalent bond strength.
60 tes the first catalytic aminoboration of C-C pi bonds by B-N sigma bonds and its application to the s
62 sequently, RR observations indicate that the pi-bonding character of the chromyl bond is actually inc
63 u3, which consists of isomers with 11 and 10 pi-bonded CNs (delta 42 and delta 89, respectively).
67 failed to take place, even when the tethered pi-bond contained an electron-withdrawing carbomethoxy g
69 xes and show that increased sigma as well as pi bonding contributes to the high stability constants o
74 combination of axial trans sigma-bonding and pi-bonding effects that include expansion of the porphin
75 g, secondary bonding interactions, sigma and pi-bond energies (multiply bonded compounds), and Lewis
79 on of this powerful construction to internal pi-bonds expands the scope of this method and opens up v
80 munchnone dipole across several nucleophilic pi-bonds failed, and instead, products derived from cycl
82 s to be no correlation between the extent of pi-bond formation (as measured by the Calpha-Cbeta dista
83 analyses of the BaNH wave function show Ba-N pi bonds formed by electron donation from the formally f
86 he balance of forces arising from sigma- and pi-bond frameworks, provides a simple method for predict
87 ition, the chemoselective use of C-C and C-O pi-bond functionality, as atom-less protecting groups as
88 to carbonyls, imines, and related polarized pi bonds has emerged as a particularly efficient and pow
89 mprised of varying degrees of both sigma and pi-bonding; however, the overall bond order is generally
90 tly synthesized, revealing that the strongly pi-bonding imido functionality prevents significant meta
91 e furo[3,4-b]indole system with the tethered pi-bond imposes distinct restrictions upon the bond angl
92 wever, the major contributor to the stronger pi bond in 1b is shown to be the unfavorable interaction
93 ch contribute to the greater strength of the pi bond in 1b, relative to that in 1a, are analyzed and
97 e between the dissociation enthalpies of the pi bonds in 1a and 1b, which is shown to amount to 16 +/
99 n of an Fe(3+)-O-O(-) intermediate to a -C=N pi-bond in a P450 system resembles the analogous reactio
100 imination sequence to introduce the required pi-bond in the C-ring of (+/-)-lycoricidine, and (2) con
104 ve functionalization of distal carbon-carbon pi-bonds in the presence of an otherwise reactive norbor
105 ne hydrogen bond, apparently to the carbonyl pi-bond, in addition to an in-plane hydrogen bond to an
106 an studies indicate that elimination of this pi-bond increases the overall pi-bond order in the conju
107 evidence for the intermolecular covalent pi-pi bonding interaction through space between neighboring
108 l oriented in the equatorial plane forming a pi-bonding interaction solely with the equatorial oxo, O
109 I) and uranium(V) species are stabilized via pi-bonding interaction, involving uranium f-orbitals and
111 also show unexpectedly that Phe(6), via the pi-bond, interacts with the receptor, consistent with th
113 ticipate in symmetry-allowed ligand-to-metal pi bonding involving phosphorus p-electrons and a metal-
114 HPtBu2)2}] is located in an antibonding Rh-N pi* bond involving the nitrido moiety, thus resulting in
115 e dominant covalent contributions arise from pi-bonding involving psi2 and psi3 orbital combinations.
116 primarily through C(term) such that the C=C pi bond is polarized with positive charge buildup on C(i
118 A striking and unexpected feature of this pi bond is that the bond strength is unchanged by substi
121 -H bond addition across alkene and polarized pi-bonds is reported for which Co(III) catalysis was sho
122 , bonded uniformly via delocalized sigma and pi bonds, is not perfectly smooth and exhibits unusual h
123 -heterocyclic carbene) disilahydronium ion ("pi-bonded" isomer) and is reminiscent of the degenerate
126 ticipating in the intermolecular covalent pi-pi bonding making them partially localized on the phenal
128 the charge density of the substrate-cofactor pi-bonding network, particularly at the adjacent alpha-c
132 al-catalyzed C-H bond additions to polarized pi bonds occur within cascade reaction sequences to prov
133 process: (i) insertion of a phenyl into the pi bond of a coordinating olefin, and (ii) C-H activatio
134 d orbital (NBO)) energy of the carbon-carbon pi bond of olefins (N = 45, R(2) values of 0.82-0.85) an
135 gation between the cyclopropane ring and the pi bond of the etheno bridge in 3 makes the barrier for
139 ted furanyl carbamates containing a tethered pi-bond on the indole ring were examined as an approach
140 XAFS studies show that cyclohexene is weakly pi-bonded on monolayer Ni/Pt(111) but di-sigma-bonded to
141 ad, products derived from cyclization of the pi-bond onto the initially formed thio-N-acyliminium ion
142 es result: oxo-peroxo species, di-sigma- and pi-bonded open ozone complexes, some eta1 and eta2 cycli
143 ogen bonding, van der Waals interactions, pi-pi bonding or metal coordination between the blocks.
144 an permitted by the usual pi-pi* FMOs of C-C pi bonds or the pi-n(+) FMOs of heavier group 14 alkyne
145 tabilizes the bioactive conformation through pi-bonding or aromatic edge-to-face interaction and that
146 tachment of an electron from the four-center pi-bonding orbital to generate (TCNE)(2)(-) + e(-).
149 haped cluster with a pentagonal cavity and a pi-bonding pattern similar to that in phenanthrene.
150 h is shown to possess 10 pi electrons with a pi-bonding pattern similar to that of naphthalene and ca
153 unctional theory (DFT), and it is found that pi-bonding plays a critical role in the rearrangement pr
157 urbed, ligand-free dumbbell in Li3NaGe2, the pi- bonding py and pz orbitals are degenerate as in mole
162 serve as starting points for non-degenerate pi-bond shifting (configuration change) via Mobius aroma
163 that mechanisms involving Huckel and Mobius pi-bond shifting can explain the observed or proposed co
164 conformational transition state, with Huckel pi-bond shifts occurring both before and after the trans
165 ntain a flat 7-membered ring and delocalized pi-bonds similar to those of tropylium ion (C(7)H(7)(+))
166 ne are 3 to 4 kcal mol-1 too small and their pi bond strengths, as given by BDE1 - BDE2, are in error
168 als feature bona fide P horizontal lineC p-p pi bonds suitable for conjugated materials having phosph
169 kness of the C=P pi bond compared to the C=C pi bonds, the energies required to reach the phosphaethe
170 bonds antiperiplanar to the breaking alkyne pi-bonds, the stabilization of the bent alkyne geometry
172 s contributions of partial sigma and partial pi bonds to the planar pentacoordinate carbons; the octe
174 ce via initial dissociation of the Ir-olefin pi-bond to give a sigma-complex of the allylic C-H bond;
175 ium-stabilized carbenoid onto the acetylenic pi-bond to give a vinyl carbenoid that subsequently cycl
177 amolecular cycloaddition across the tethered pi-bond to give thio-bicycloannulated products in a one-
179 utadienyl ligand, HCC(Ph)C(H)C(H)Ph, that is pi-bonded to the osmium atom and sigma-bonded to the pla
182 ition across both alkenyl and heteroaromatic pi-bonds to provide novel pentacyclic compounds in good
184 of hexahydroindolinones containing tethered pi-bonds undergo a related acid-induced cyclization reac
185 o bond to a small four-membered ring favours pi-bonding, utilizing 5f- instead of 6d-orbitals, over d
186 e derived from cyclization onto the terminal pi-bond was trapped with p-TsOH from the least hindered
187 ally, for torsion angles up to 80 degrees CH/pi bonds were found, whereas the long C(Me)-C(i) and C(M
189 polyunsaturated substrates at a predictable pi-bond which may be either terminal or, as shown herein
190 ts one of the phenyl sides to establish a CH/pi bond with one of the ortho carbon atoms (the C(o) sid
191 group of the GABA molecule may form a cation-pi bond with residues in a highly conserved "aromatic bo
192 d RS-O(-) fragment is incapable of forming a pi bond with the Fe(III) center, the unmodified thiolate
193 urations could be achieved through sigma and pi bonds with 18 electrons/Fe for the FeC3 site and 18-n
194 egenerate, or nearly degenerate pair that is pi-bonding with respect to Fe-NO and pi-antibonding with
195 Conjugation of allylic C-H bonds with the pi-bond would explain the chemoselectivity observed for
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