Transition-metal-substituted diphosphenes. 16. [1 + 4] Cycloaddition of a diphosphene to a,b-unsaturated carbonyl compounds: synthesis of dihydro-1,2-l5-oxaphospholes with exocyclic phosphorus-phosphorus double bonds and x-ray structure analysis of [cyclic] (h5-C5Me5)(CO)2FeP[OCH:CHCH2](:PAr) (Ar = 2,4,6-tert-Bu3C6H2).
The reaction of [Fe]P:PR ([Fe] = (h5-C5Me5)(CO)2Fe, R = 2,4,6-tert-Bu3C6H2] with acrolein, methacrolein, and 3-buten-2-one in benzene at 20 Deg afforded the oxaphospholes I (R1 = R2 = H; R1 = H, R2 = Me; R1 = Me, R2 = H) with exocylic P:P double bonds. A similar Ru diphosphenyl complex was also prepd. The crystal structure of I (R1 = R2 = H) was detd.
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