879280-58-7Relevant academic research and scientific papers
Reactivity of cyclooligophosphanes: Synthesis and structural characterisation of cyclo-1,4-(BH3)2(P4Ph 4CH2) and cyclo-1,2-(BH3)2(P 5Ph5)
Wolf, Robert,Finger, Markus,Limburg, Carolin,Willis, Anthony C.,Wild, S. Bruce,Hey-Hawkins, Evamarie
, p. 831 - 837 (2007/10/03)
The borane complexes cyclo-1,4-(BH3)2(P 4Ph4CH2) (3) and cyclo-1,2-(BH 3)2(P5Ph5) (4) were prepared by reaction of cyclo-(P4Ph4CH2) and cyclo-(P 5Ph5) with BH3(SMe2). Only the 2: 1 complexes 3 and 4 were isolated, even when an excess of the borane source was used. In solution, 3 exists as a mixture of the two diastereomers (R P*,SP*,SP*,R P*)-(±)-3 and (RP*,R P*,RP*,RP*)-(±)-3. However, in the solid state the (RP*,SP*, SP*,RP*)-(±) diastereomer is the major stereoisomer. Similarly, while only one isomer of 4 is observed in its X-ray structure, NMR spectroscopic investigations reveal that it forms a complex mixture of isomers in solution. 3 may be deprotonated with tBuLi to give the lithium salt cyclo-1,4-(BH3)2(P 4Ph4CHLi) (3·Li), though this could not be isolated in pure form. The Royal Society of Chemistry 2006.
