Found inside – Page 6MOLECULAR AND VALENCE STRUCTURES OF COMPLEXES OF CYCLOOCTATETRAENE WITH IRON ... Phenyl radicals , * Electrons , * Nuclear magnetic resonance , Complex ions ... Found inside – Page 285Moreover presence of phenyl group, increases stability of carbocation through delocalisation of electrons. Hence, carbocations (1) and (3) are more stable ... Found inside – Page 179Another experimental evidence for this type of limitation is provided by the XPS valence band measurements of the ... valence band structures of the series of n - phenyl molecules converging to the polymer p - polyphenyl whose valence band ... Found inside – Page 1376-590.08976 -594.00042 ( 122.0 , 99.7 ) 17c similarly for the unsubstituted and 4 - methylphenylnitrenium ion ( So - T ... In these reduced valence cations , it is expected that electron - donating groups will stabilize singlet states more than the ... Found inside – Page 44Accordingly to reduce the acidity of the hydrochloride of phenyl hydrazine and to increase the amount of free base it is customary ... by a finer mechanism , its shorter waves , picks out the very bonds of the atoms themselves , the valence electrons , and ... Light is thus an enormously more powerful chemical agent than heat . Found inside – Page 44-30Glover, S.A. and Scott, A. P., MNDO properties of heteroatom and phenyl ... McClelland, R. A., Davidse, P. A., and Hadzialic, G., Electron deficient strong ... Found inside – Page 134former case there is a nucleophilic attack on the radical cation, whereas in the latter the radical cation deprotonates to yield the l0-phenyl-9-anthryl ... Found inside – Page 23If all three hydrogen atoms are replaced by phenyl groups , the valence electrons should be considerably displaced ... It is particularly instructive that the chemical reactions of the compounds of triphenylmethyl , for example , triphenylmethyl ... Found inside – Page 129Where resonance stability is completely lacking , as in the phenyl cation , the ion is usually very short - lived . ... Since the central carbon of carbonium ions has only three bonds , and no other valence electrons , the bonds are sp2 and should ... Found inside – Page 298... 135 22 - , Nonanal , 91 Phenyl cation , 71 ,. by valence shell electron pair repulsion , - , reaction with propylamine , 2 , 18 , 19 135 N.m.I. , carbon - 13 , 159 , 172 , 177 , 201 , 215 Methylcycloheptatriene , 79 - , proton , and phenylallyllithiums ... Found inside – Page 804.5c ) , but conversely , the carbocation can be destabilised if there are electron - withdrawing groups ( X ) attached . ... These especially stabilised cases should not be confused with vinyl and phenyl carbocations , which are particularly destabilised because resonance ... charged heteroatom is the more important contributor in these cases because all atoms have a complete octet of valence electrons . Found inside – Page 155Effect of nonequilibrium solvation on chemical reacVariational transition ... aryl imido / amido complex which indicates that the high electron density at ... Found inside – Page 1215The Mo - N ( phenyl isocyanate nitrogen ) distances of 2.338 ( 9 ) Å ( Mo1 - N5 ) and 2.380 ( 8 ) Å ( Mo2 - N5 ) are ... If the terminal NPh ligand is regarded as a six - electron donor , each Mo metal in 4 has 16 valence electrons without ... Found inside – Page 261Although 62 can be given a count of 104 valence electrons, a description ... Molecular structures of 58, 59, and the cation in 60 (phenyl groups omitted). Found inside – Page 1294group ( C6H5 + ) by the new positive corner of the methyl carbon atom and the capture of the phenyl group by the new ... 6 valence electrons , as compared with N- in which the full complement of 8 electrons is found in the valence electron ... Found inside – Page 217As was established later using the method of quantum-chemical calculations ... existence of electron levels in the region of previously forbidden energies. Found inside – Page 2236( auth ) 22073 EVIDENCE FOR PHENYL CATION AS AN INTERMEDIATE IN REACTIONS OF ... A normal - coordinate analysis gave reasonable valence force constants and ... Found inside – Page 91One of the phenyl rings in the [ BPh4 ] - anion could even be metalated with CH4 elimination by an electrophilic attack of the highly electron - deficient 14 - valence electron [ ( C5Me5 ) 2ZrMe ] cation ( 101 ) . Phenyl metallation results in an ... Found inside – Page 594... aryl , halides , and so on . Nitrenium ions are similar to nitrenes in that both classes possess a nitrogen atom with only six valence electrons ( Fig . Found inside – Page 213Whereas for the phenyl group three structures with the free valence in the ... spin of the odd electron in the radical makes a paramagnetic contribution . Found inside – Page 128The conjugation effect as seen by electron deformation density in phenyl ... to visualise the chemical bonds which are due to the valence electron clouds on ... Found inside – Page 279Based Completely on the Electron Theory Rudolph Macy ... H H H : C H :! : H H : C : Ü Η ́ H H Methyl ion Phenyl ion Methyl ion Phenyl ion H Carbonium ions Carbanions A carbonium ion is one in which a carbon atom has released a valence electron , so that the resulting ion has a positive charge ( section 10.3 ) . Found inside – Page 23If all three hydrogen atoms are replaced by phenyl groups , the valence electrons should be considerably displaced from the ... It is particularly instructive that the chemical reactions of the compounds of triphenylconclusion most admirably . Found inside – Page 153The **C hyperfine couplings for the free valence carbon atom in the fully deuteriated phenyl radical have been observed.” The isotropic value (129 G) is ... Found inside – Page 4960... excitation, the energy levels of molecules such as Ph-X-R (X = O, S.; R = Me) have been calculated by the valence-bond (V.B.) method. ... Chromophore - The second phenyl group in diphenyl sulphide is practically ineffective in changing the absorption. ... Ph., conventionally labelled it" (obviously modified by SMe or SPh acting as side-chain), and from the eight electrons in a chromophore Ph;S, arising ... Found inside – Page 158... Cp* Pentamethylcyclopentadienyl CVE Cluster valence electron DFT Density ... Phenyl PR3 Organophosphine PSEPT Polyhedral skeletal electron pair theory ... Found inside – Page 5Assuming that electrons in closed shells exert their full screening power on each other and that the screening constant of one valence electron for another is 0.5 and choosing constants which will make the electrostatic potential scale of ... Found inside – Page 8The chemical shift behavior is reminescent of benzyl-Grignard reagents and ... are clearly visible in valence electron photoelectron spectra (UV-PES) in ... Found inside – Page 61... NDDO STUDY OF ANTIAROMATIC THREE - MEMBERED RINGS AND THEIR VALENCE TAUTOMERS , Michael J . S . Dewar ... 9 Jul 73 , Sp AFOSR - TR - 74 - 0960 Contract F44620 - 71 - C - 0119 Availability : Pub . in Jnl . of The Chemical ... of cinnamyl phenyl ether yields both ortho and para products , contrary to Descriptors : * Chemical radicals , Molecular ... Identifiers : * Organic sulfides . lonic fragmentations induced by electron - impact on compounds of the type C6F5SX ( X ... Found inside – Page 2497Chemical Society (Great Britain) ... Part II , all - valence - electron calculations for monosubstituted benzenes : an of the sigma inductive effect , 984 . substitution . ... Part I , reaction of the helium tritiide molecular ion with halogenobenzenes , 2086. ... methylaniline ) , 457 . on ordering factors in mass spectral rearrangements : loss of keten from halogenated phenyl acetates and acetanilides , 1515 . Effect of ... Found inside – Page 238V. PARTICIPATION OF FREE AND VALENCE ELECTRONS IN REDUCTION REACTIONS AT A GERMANIUM ELECTRODE ... For a given rubber and a given chemical class of solvents ... Found inside – Page 16EVIDENCE FOR PHENYL CATION WITH AN ODD NUMBER OF PI ELECTRONS FROM THE ... stability of the color , valence of tin , wave length at which the color is read ... Found inside – Page 157The XUV pulse is capable of ionizing all valence and some inner shell orbitals, ... It is known that the π1 state of the phenyl radical cation absorbs ... Found inside – Page 1125The Question of Si-C par—pir-Electron Delocalization and Comparison with George A. ... Delocalized charges in phenyl-substituted anions and cations tend to ... Found inside – Page 1776... silane and isotopomers , 134 : 766339 nitrene - azo equil . of 1 - phenyl - 3- ( Q - cyano ) . benzylidenetriazene studied ... 134 : 121177g nonadiabatic bending dissocn . in 16 valence electron system OCS , 129 : 306677k for non - adiabatic ... Found inside – Page 139The collective electron resonance at 21 eV is a major source of energy absorption for ... that out of the 38 valence electrons (26 a. and 12 non-bonding), ... Found insideMeeting, American Chemical Society. acetylene is trimerised to hexaphenylbenzene . ... the highest occupied donor orbital in the phenyl group , which is conjugated with the non - bonded valence electrons of the substituent atom . and TCNE . Found inside – Page 214Table IV also shows that the cyclopropyl group (813C at -—86.8 ppm) stabilizes an electron-deficient carbon more than a hydrogen (2-propyl cation) but less ... Found inside – Page 138The initial product III has a 17 electron Ni and moving the second phenyl group to ... of IV are all planar and both anions have 17 metal valence electrons. Found inside – Page 329Phenylmercury iodide is formed when diphenyliodonium iodide is refluxed in n - propyl alcohol over mercury ( 95 ) : ( CH3 ) , II + Hg ... complex in which more than eight valence electrons surround the iodine atom ( i.e. , d - electrons also participate in the valence bonds ) ... that the decomposition of diphenyliodonium fluoroborate products phenyl cations instead of phenyl radicals : [ CoH ; : I : C & H 1+ BFT ... Found inside – Page 6646( 2 ) In [ FeCl ( OECorr ) ] and [ FeCl ( TPCorr ) ] the corrolate is one - electron oxidized and noninnocent , with net negative spin density ... with PW91 gradient corrections , and Slater - type valence triple - S plus polarization basis sets , while in the present study we have ... cation radical electron configuration while the phenyl carbanion axial ligand favors the Fe ( IV ) electron configuration , we should recall ... Found inside – Page 361... such as a halide ion , : X ; the hydride ion , Ho ; or the methyl or phenyl anions . These ions contribute as many electrons as the CO but differ in ... Found inside – Page 103Experimental data for the simplest polyphenyl - biphenyl indicate the value for ... of the methods taking into account all valence electrons ( CNDO etc. ) . Found inside – Page 84... [AsPh4 ]+ Lewis structure: Ph Ph As Ph Ph central atom: arsenic valence electrons on central atom: ... Only the attached phenyl carbon atoms are shown. Found inside – Page 4410 8 The formation of the osazones is made in practice by using phenyl hydrazine hydrochloride in place of the free phenyl hydrazine . ... the reaction of the phenyl hydrazine with the sugar involves the free base of the hydrazine and not the ion of the salt . ... its shorter waves , picks out the very bonds of the atoms themselves , the valence electrons , and tears them away from or injects them into atoms . Found inside – Page 64O bond between a phenyl ring and a sulfonate moiety (7.8 kJ/mol). ... According to literature, the analysis of valence electron density or deformation ... Found inside – Page 56Time constraints permit only two results to be presented from our QITMS studies of six - valence electron charged carbene ... 5 , adducts with ethylene are formed at m / z 121 whose collision - induced dissociation gives both phenyl cations ( m ... Found inside – Page 388Under the same conditions diphenyliodonium chloride forms phenylmercuric chloride with a yield of 40 % . ... complex in which the iodine atom possesses more than eight valence electrons ( d - electrons also participate in the formation of valence bonds ) : . ... Hg ' → CoHz : Hg : C1 + CoHg : I : It is interesting that phenyl cations and not phenyl radicals are ormed in the decomposition of diphenyliodonium ... , Nonanal, 91 phenyl cation, 71, reaction with propylamine, 2 18... 2, 18, 19 135 N.m.I 19 135 N.m.I, Nonanal, 91 phenyl cation, 71, hydrazine! Inside – Page 594... aryl, halides, and so on involves the free of. Instructive that the π1 state of the helium tritiide molecular ion with halogenobenzenes,.. Results in an... found inside – Page 23If all three hydrogen atoms replaced! ( Q - cyano )... imaging of purely valence-electron dynamics during a chemical.... The helium tritiide molecular ion with halogenobenzenes, 2086 keten from halogenated acetates. 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