PHOSPHORUS BORON AND PHOSPHORUS-SILICON RING-SYSTEMS FUNCTIONALIZATION OF PHOSPHORUS RING-SYSTEMS

The diphosphide K-2[(t-Bu)P-BN(i-Pr)(2)-P(t-Bu)] reacts with t-BuPCl(2) to form the P3B ring system (i-Pr)(2)NB(t-BuP)(3) 1. The five-membered P4B ring system (i-Pr)2NB(t-BuP)(4) 2 is formed from K-2[(t-BuP)(4)] 3 and (i-Pr)(2)NBCl2 analogous to the above reaction. The reaction of 3 with SiCl4 or Si2Cl6 produces the novel five-membered ring systems (t-BuP)(4)SiCl2 4 or (t-BuP)(4)Si(Cl)SiCl3 5 respectively. New routes to the synthesis of the monofunctionalized cyclophosphanes (t-BuP)(2)PCl 6 and (t-BuP)(3)PCl 7 and to the new bifunctionalized cyclophosphane 1-Br-3-[(t-Bu)(Br)P]-2.4-(t-Bu)(2)-P-4 8 will be reported. 1, 2, 4, and 7 could be characterized by X-ray structure analysis; the structures of 5 and 8 could be inferred from NMR data. The P-31 NMR spectra of 2 and 7 indicate (B-10,B-11) and (Cl-35,Cl-37) isotopic shifts respectively.