The mass spectra of the following compounds are reported: (1) the π-cycloheptatrienyl derivatives C<sub>5</sub>H<sub>5</sub><i>MC</i><sub>7</sub>H<sub>7</sub> (<i>M</i> = V and Cr); (2) the π-pyrrolyl derivative C<sub>5</sub>H5 FeC<sub>4</sub>H<sub>4</sub>N; (3) the ethylene derivative C<sub>5</sub>H<sub>5</sub>Rh (C<sub>2</sub>H<sub>4</sub>)<sub>2</sub>; (4) the 1,5-cyclooctadiene derivatives C<sub>5</sub>H<sub>5</sub><i>M</i>C<sub>8</sub>H<sub>12</sub> (<i>M</i> = Rh or Ir); (5) the trimethylplatinum derivative (CH<sub>3</sub>)<sub>3</sub>PtC<sub>5</sub>H<sub>5</sub>; (6) the nickel and palladium complexes C<sub>3</sub>H<sub>5</sub>PdC<sub>5</sub>H<sub>5</sub>, C<sub>10</sub>H<sub>12</sub>OCH<sub>3</sub>PdC<sub>5</sub>H<sub>5</sub>, and C<sub>5</sub>H<sub>5</sub>NiC<sub>13</sub>H<sub>17</sub>. The following features of particular interest were observed: (1) evidence for elimination of neutral C<sub>6</sub>H<sub>6</sub> fragments from the C<sub>5</sub>H<sub>5</sub>-<i>M</i>C<sub>7</sub>H<sub>7</sub> compounds; (2) evidence for elimination of C<sub>2</sub>H<sub>2</sub>, HCN, C<sub>2</sub>H<sub>2</sub>N, C<sub>4</sub>H<sub>4</sub>N, and Fe fragments from the parent ion of C<sub>5</sub>H<sub>5</sub>FeC<sub>4</sub>H<sub>4</sub>N; (3) evidence for stepwise elimination of ethylene ligands from C<sub>5</sub>H<sub>5</sub>Rh (C<sub>2</sub>H<sub>4</sub>)<sub>2</sub>; (4) evidence for relatively weak metal–π-cyclopentadienyl bonds in the nickel and palladium derivatives.

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