Synthesis and Structure of a 1,1‘-Diphospha[2]ferrocenophane

2001-03-13T00:00:00Z (GMT) by
A four-step sequence allows us to transform 1-phenyl-3,4-dimethylphosphole-2-carboxaldehyde (<b>1</b>) into the bis(phosphole) <b>5</b> with a CH<sub>2</sub>CH<sub>2</sub> bridge between the two α-carbons. The cleavage of the two P−phenyl bonds of <b>5</b> by lithium, followed by the reaction of the bis(phospholide) thus formed with FeCl<sub>2</sub>, gives the corresponding 1,1‘-diphospha[2]ferrocenophane <b>7</b>, which displays a tilt angle of 20°.