Biphenylene readily forms co-ordination compounds using one or both of its six-membered rings, but not its four-membered ring.BIPHENYLENE can be written with five Kekulb structures of which one represents it as a cyclobutane derivative (I), two as a cyclobutadiene derivative, and the remaining two as a cyclobutene derivative. In might therefore be expected to form co-ordination compounds by using either of its six-, or its four-membered ring. We have attempted to obtain both types of complex but succeeded in getting only the benzene type.When biphenylene is heated at 130" for 4 hr. with tricarbonyldiglymemolybdenum (4 mols.) [diglyme = 0 (CH,*CH,*OMe) , ] it readily forms scarlet p-biphenylenebis(tricarbonylmolybdenum) (11). The trans-arrangement is implied from the molecular centre of symmetry shown by the X-ray crystal data. This substance is stable in air and only sparingly soluble in hot organic solvents, giving solutions which rapidly decompose. Equimolecular proportions of the above reactants, heated at 100" for 64 hr., form orange tricarbonylbiphenylenemolybdenum , [C,,H,Mo (CO),] , soluble in organic solvents. [196l]n-Complexes of Biphenylene.

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Complexes of the types M [PtCI,ac] and trans- [PtCl,ac(amine)], where M = Na or K, and ac = a tertiary a-hydroxyalkyl-or a-methoxyalkylacetylene, are described. The stabilities of the complexes depend on the nature of the ct-substituents of the acetylene.The infrared spectra of the complexes show that the CiC stretching frequency of the acetylenes is reduced by some 200 cm.-l on complex formation, and that the O-H stretching frequency of the hydroxyacetylenes is similarly reduced by 110-140 crn.-l. Evidence is presented for a structure in which the hydroxyacetylene is bonded to the platinum atom through its triple bond and also to the chlorine atoms through its hydroxyl groups. Dipole moments and pertinent features of the infrared and nuclear magnetic resonance spectra are recorded. Ally1 alcohol complexes have analogous structures. The methoxyacetylenes form relatively unstable complexes having the methoxyl groups turned away from the platinum atom.