K. Maitra et Jh. Nelson, REGIOSELECTIVE INTRAMOLECULAR [4-ALDER CYCLOADDITION REACTIONS OF ALLENYLPHOSPHINEPENTACARBONYLMOLYBDENUM COMPLEXES WITH 3,4-DIMETHYL-1-PHENYLPHOSPHOLE(2] DIELS), Bulletin de la Societe chimique de France, 134(10-11), 1997, pp. 859-867
Intramolecular [4 + 2] Diels-Alder cycloaddition reactions of cis(alle
nylphosphine) (3,4-dimethyl-1-phenylphosphole) tetracarbonylmolybdenum
complexes occur regioselectively at the allenyl C-alpha = C-beta doub
le bond to form hosphino-3-exo-methylene-7-phosphanorbornenetetrac arb
onylmolybdenum complexes. Analogous ropargylphosphine)(3,4-dimethyl-1-
phenylphosphole) tetracarbonylmolybdenum complexes do not undergo intr
amolecular cycloadditions. The new complexes were characterized by ele
mental analyses, physical properties, H-1, C-13(H-1), P-31(H-1) NMR sp
ectroscopy, infrared spectroscopy and X-ray crystallography.