Durch reduktive Kopplung des Dichlorphosphins (I) in Gegenwart von (II) wurde das Diphosphen (III) dargestellt.

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The crystal structure of dimethylfulvene has been determined at -50 °C. The crystal system is monoclinic; the space group is C2/c, with four molecules per unit cell; a=12.07, b=8.36, c=7.27 A, fl=lll.5 °.Molecular parameters have been determined by Fourier and least-squares refinements of 3 dimensional data.The five membered ring is coplanar; the methyl carbon atoms are only 0-035 A out of that plane. The two double bonds in the ring are 1.346 A long; the double bond outside the ring is 1.343 A long; single bonds in the ring are 1.439 and 1.435/~ long; the single C-C bonds to the methyl groups are 1.520/~ long. The average standard deviation of bond lengths is 0.011 A.An interesting system of conjugated single and double bonds is present in the dimethylfulvene molecule,This investigation was undertaken primarily to determine the effect of the conjugation on the relative lengths of the single and double carbon to carbon bonds.

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