Abstract
In a search for cyclic phosphine—boranes, which can be expected to undergo ring opening polymerisation, or decomposition, to leave boron phosphide, the hydroboration reaction of ω-alkenyl-diphenylphosphines with boranes was investigated. Addition of one equivalent of borane (introduced as its tetrahydrofuran adduct) to phosphines H 2C CH (CH 2) n PPh 2 ( n = 0, 1, 2) gave the corresponding phosphine—boranes H 2C CH (CH 2) n -PPh 2BH 3 without any further cyclisation. With an excess of (thf)BH 3, hydroboration of the olefinic function occurred, but again no ring closure. Treatment of the alkenylphosphines with 9-borabicyclononane gave the expected cyclic phosphine—boranes (C 8H 14)B (CH 2) n PPh 2 ( n = 3, 4) in good yield as crystalline products. The structures of the two heterocycles have been determined by X-ray diffraction methods. They show the expected strain-free ring systems with short P B bonds, comparable with the isoelectronic Si C systems.
Sign-in/Register to access full text options 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
