text: Yo, check it out, I got a story to tell
  About 44 phosphines, put 'em to the test, oh well
  Combined with [RuCl(2)(C(6)H(6))](2), four more precursors too
  See if they could make catalysts for CO(2) reduction, true
  
  Half of 'em, 22, showed some activity
  But only 6 had that high productivity
  PMe(3), PPhMe(2), dppm, and dppe
  Plus cis- and trans-Ph(2)PCH=CHPPh(2), the VIPs
  
  In situ catalysts, made with [RuCl(2)(C(6)H(6))](2) in the mix
  Matched the efficiency of RuCl(O(2)CMe)(PMe(3))(4), no tricks
  Basicity of monophosphines ain't linked to activity
  But diphosphines with small bite angles, they got the key
  
  The weakly basic ones, they showed that fire
  While the strongly basic ones, they went the opposite desire
  In situ (31)P NMR spectroscopy revealed
  Trans-Ru(H)(2)(dppm)(2), trans-RuCl(2)(dppm)(2), and the deal
  
  Trans-RuHCl(dppm)(2), cis-Ru(H)(O(2)CH)(dppm)(2), keep it real
  Cis-Ru(O(2)CH)(2)(dppm)(2), the major players, oh what a thrill
  Reacting with dppm, [RuCl(2)(C(6)H(6))](2) in the mix
  Under catalytic conditions at 50 degrees C, that's the fix