<?xml version="1.0" encoding="UTF-8"?><xml><records><record><source-app name="Biblio" version="7.x">Drupal-Biblio</source-app><ref-type>17</ref-type><contributors><authors><author><style face="normal" font="default" size="100%">Pignotti, Louis R.</style></author><author><style face="normal" font="default" size="100%">Kongprakaiwoot, Natcharee</style></author><author><style face="normal" font="default" size="100%">Brennessel, William W.</style></author><author><style face="normal" font="default" size="100%">Baltrusaitis, Jonas</style></author><author><style face="normal" font="default" size="100%">Luck, Rudy L.</style></author><author><style face="normal" font="default" size="100%">Urnezius, Eugenijus.</style></author></authors></contributors><titles><title><style face="normal" font="default" size="100%">1,4-Bis(phosphine)-2,5-difluoro-3,6-dihydroxybenzenes and their P-oxides: Syntheses, structures, ligating and electronic properties.</style></title><secondary-title><style face="normal" font="default" size="100%">Journal of Organometallic Chemistry</style></secondary-title></titles><keywords><keyword><style  face="normal" font="default" size="100%">crystal structure diphosphine phosphine oxide hydroxyphenyl fluoro difluorohydroquinone</style></keyword><keyword><style  face="normal" font="default" size="100%">frontier orbital diphosphine hydroxyphenyl fluoro difluorohydroquinone</style></keyword><keyword><style  face="normal" font="default" size="100%">mol structure diphosphine phosphine oxide hydroxyphenyl fluoro difluorohydroquinone</style></keyword><keyword><style  face="normal" font="default" size="100%">nickel chelate complex hydroxyphenylphosphine difluorohydroquinone diphosphine bridged prepn</style></keyword><keyword><style  face="normal" font="default" size="100%">oxidn potential diphosphine phosphine oxide hydroxyphenyl fluoro benzenediol difluorohydroquinone</style></keyword><keyword><style  face="normal" font="default" size="100%">phosphine diphosphine hydroxyphenyl fluoro difluorohydroquinone prepn structure</style></keyword></keywords><dates><year><style  face="normal" font="default" size="100%">2008</style></year><pub-dates><date><style  face="normal" font="default" size="100%">2008///</style></date></pub-dates></dates><publisher><style face="normal" font="default" size="100%">Elsevier Ltd.</style></publisher><volume><style face="normal" font="default" size="100%">693</style></volume><pages><style face="normal" font="default" size="100%">3263 - 3272</style></pages><isbn><style face="normal" font="default" size="100%">0022-328X</style></isbn><language><style face="normal" font="default" size="100%">eng</style></language><abstract><style face="normal" font="default" size="100%">Difluorinated p-diphosphino-1,4-benzenediols 2,5-F2-3,6-(R2P)2C6(OH)2-1,4 (2a,b; R = Ph, iPr), their nickel chelate P,O-complexes, and P,P'-dioxides (3a,b; R = Ph, iPr) were prepd. and characterized.  Reactions of 1,4-difluoro-2,5-dimethoxybenzene with LDA (1:2) at low temps. generated organodilithio intermediates; quenching the reaction mixts. with chlorophosphines ClPR2 produced 1,4-(R2P)2-2,5-difluoro-3,6-dimethoxybenzenes (1a,b; R = Ph, iPr).  Demethylation of 1a-b was accomplished by BBr3, yielding bis(phosphino)hydroquinones 2a-b.  Treating 2a-b with excess hydrogen peroxide produced bis(phosphinyl)hydroquinones 3a-b.  The binucleating properties of 2a were established by the formation of a bimetallic nickel complex upon reaction with Ph2Ni(PMe3)2.  Electrochem. activity of hydroquinones 2a-b and 3a-b was examd. by cyclic voltammetry.  In addn., compds. 2a, 3a and 3b were obtained in cryst. form and characterized by single-crystal x-ray diffraction.  The influence of the fluorine substituents on the compn. of the frontier orbitals of 2a and 3a was examd. by computational methods. [on SciFinder(R)]</style></abstract><issue><style face="normal" font="default" size="100%">20</style></issue><notes><style face="normal" font="default" size="100%">CAPLUS AN 2008:1135825(Journal)</style></notes></record></records></xml>