Spontaneous dehydrocoupling in peri-substituted phosphine-borane adducts

Laurence John Taylor, Brian Andrew Surgenor, Piotr Wawrzyniak, Matthew James Ray, David Bradford Cordes, Alexandra Martha Zoya Slawin, Petr Kilian

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6 Citations (Scopus)
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Abstract

Bis(borane) adducts Acenap(PiPr2·BH3)(PRH·BH3) (Acenap = acenaphthene-5,6-diyl; 4a, R = Ph; 4b, R = ferrocenyl, Fc; 4c, R = H) were synthesised by the reaction of excess H3B·SMe2 with either phosphino-phosphonium salts [Acenap(PiPr2)(PR)]+Cl (1a, R = Ph; 1b, R = Fc), or bis(phosphine) Acenap(PiPr2)(PH2) (3). Bis(borane) adducts 4a–c were found to undergo dihydrogen elimination at room temperature, this spontaneous catalyst-free phosphine-borane dehydrocoupling yields BH2 bridged species Acenap(PiPr2)(µ-BH2)(PR·BH3) (5a, R = Ph; 5b, R = Fc; 5c, R = H). Thermolysis of 5c results in loss of the terminal borane moiety to afford Acenap(PiPr2)(µ-BH2)(PH) (14). Single crystal X-ray structures of 3, 4b and 5a–c are reported.

Original languageEnglish
Pages (from-to)1976-1986
JournalDalton Transactions
Volume45
Issue number5
Early online date21 Aug 2015
DOIs
Publication statusPublished - 7 Feb 2016

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