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The FLP <jats:bold>2\u2009b<\/jats:bold> is inactive toward dihydrogen under typical ambient conditions, in contrast to the C<jats:sub>2<\/jats:sub>\u2010 and C<jats:sub>4<\/jats:sub>\u2010bridged FLP analogues. Dynamic NMR spectroscopy showed that this was not due to kinetically hindered P\u22c5\u22c5\u22c5B dissociation of <jats:bold>2\u2009b<\/jats:bold>. DFT calculations showed that the hydrogen\u2010splitting reaction of the parent compound <jats:bold>2\u2009a<\/jats:bold> is markedly endergonic. The PH<jats:sup>+<\/jats:sup>\/BH<jats:sup>\u2212<\/jats:sup> H<jats:sub>2<\/jats:sub>\u2010splitting product of <jats:bold>2\u2009b<\/jats:bold> was indirectly synthesized by a sequence of H<jats:sup>+<\/jats:sup>\/H<jats:sup>\u2212<\/jats:sup> addition. It lost H<jats:sub>2<\/jats:sub> at ambient conditions and confirmed the result of the DFT analysis.<\/jats:p>","DOI":"10.1002\/chem.201505200","type":"journal-article","created":{"date-parts":[[2016,3,21]],"date-time":"2016-03-21T22:34:03Z","timestamp":1458599643000},"page":"5988-5995","source":"Crossref","is-referenced-by-count":44,"title":["Why Does the Intramolecular Trimethylene\u2010Bridged Frustrated Lewis Pair Mes<sub>2<\/sub>PCH<sub>2<\/sub>CH<sub>2<\/sub>CH<sub>2<\/sub>B(C<sub>6<\/sub>F<sub>5<\/sub>)<sub>2<\/sub> Not Activate Dihydrogen?"],"prefix":"10.1002","volume":"22","author":[{"given":"Thomas","family":"\u00d6zg\u00fcn","sequence":"first","affiliation":[{"name":"Organisch-Chemisches Institut Westf\u00e4lische Wilhelms-Universit\u00e4t  Corrensstrasse 40 48149 M\u00fcnster Germany"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Ke\u2010Yin","family":"Ye","sequence":"additional","affiliation":[{"name":"Organisch-Chemisches Institut Westf\u00e4lische Wilhelms-Universit\u00e4t  Corrensstrasse 40 48149 M\u00fcnster Germany"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Constantin G.","family":"Daniliuc","sequence":"additional","affiliation":[{"name":"Organisch-Chemisches Institut Westf\u00e4lische Wilhelms-Universit\u00e4t  Corrensstrasse 40 48149 M\u00fcnster Germany"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Birgit","family":"Wibbeling","sequence":"additional","affiliation":[{"name":"Organisch-Chemisches Institut Westf\u00e4lische Wilhelms-Universit\u00e4t  Corrensstrasse 40 48149 M\u00fcnster Germany"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Lei","family":"Liu","sequence":"additional","affiliation":[{"name":"Mulliken Center for Theoretical Chemistry Institut f\u00fcr Physikalische und Theoretische Chemie Universit\u00e4t Bonn  Beringstra\u00dfe 4 53115 Bonn Germany"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-5844-4371","authenticated-orcid":false,"given":"Stefan","family":"Grimme","sequence":"additional","affiliation":[{"name":"Mulliken Center for Theoretical Chemistry Institut f\u00fcr Physikalische und Theoretische Chemie Universit\u00e4t Bonn  Beringstra\u00dfe 4 53115 Bonn Germany"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Gerald","family":"Kehr","sequence":"additional","affiliation":[{"name":"Organisch-Chemisches Institut Westf\u00e4lische Wilhelms-Universit\u00e4t  Corrensstrasse 40 48149 M\u00fcnster Germany"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Gerhard","family":"Erker","sequence":"additional","affiliation":[{"name":"Organisch-Chemisches Institut Westf\u00e4lische Wilhelms-Universit\u00e4t  Corrensstrasse 40 48149 M\u00fcnster Germany"}],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"311","published-online":{"date-parts":[[2016,3,21]]},"reference":[{"key":"e_1_2_6_1_1","doi-asserted-by":"publisher","DOI":"10.1002\/anie.201409800"},{"key":"e_1_2_6_1_2","doi-asserted-by":"publisher","DOI":"10.1002\/ange.201409800"},{"key":"e_1_2_6_2_1","doi-asserted-by":"publisher","DOI":"10.1007\/128_2012_373"},{"key":"e_1_2_6_3_1","doi-asserted-by":"publisher","DOI":"10.1039\/b710475h"},{"key":"e_1_2_6_4_1","doi-asserted-by":"publisher","DOI":"10.1039\/C4SC00395K"},{"key":"e_1_2_6_5_1","unstructured":"See for example"},{"key":"e_1_2_6_6_2","doi-asserted-by":"publisher","DOI":"10.1021\/ja302652a"},{"key":"e_1_2_6_7_2","doi-asserted-by":"publisher","DOI":"10.1002\/anie.201208750"},{"key":"e_1_2_6_7_3","doi-asserted-by":"publisher","DOI":"10.1002\/ange.201208750"},{"key":"e_1_2_6_8_2","doi-asserted-by":"publisher","DOI":"10.1002\/anie.201307551"},{"key":"e_1_2_6_8_3","doi-asserted-by":"publisher","DOI":"10.1002\/ange.201307551"},{"key":"e_1_2_6_9_2","doi-asserted-by":"publisher","DOI":"10.1021\/ja4118335"},{"key":"e_1_2_6_10_1","doi-asserted-by":"publisher","DOI":"10.1016\/j.cattod.2014.10.040"},{"key":"e_1_2_6_11_1","unstructured":"\u00a0"},{"key":"e_1_2_6_12_2","doi-asserted-by":"publisher","DOI":"10.1002\/anie.200801432"},{"key":"e_1_2_6_12_3","doi-asserted-by":"publisher","DOI":"10.1002\/ange.200801432"},{"key":"e_1_2_6_13_2","doi-asserted-by":"publisher","DOI":"10.1021\/ja512658m"},{"key":"e_1_2_6_14_2","doi-asserted-by":"publisher","DOI":"10.1002\/chem.201502278"},{"key":"e_1_2_6_15_1","doi-asserted-by":"publisher","DOI":"10.1021\/ja413060u"},{"key":"e_1_2_6_16_1","unstructured":"\u00a0"},{"key":"e_1_2_6_17_2","unstructured":"Dissertation P. 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