US PATENT SUBCLASS 556 / 143
.~.~.~.~ Plural unsaturated five-membered carbocyclic rings bonded directly to the metal (e.g., ferrorcenes, bis indenyl iron, etc.)

Current as of: June, 1999
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556 /   HD   ORGANIC COMPOUNDS -- PART OF THE CLASS 532-570 SERIES

*  DD  ORGANIC COMPOUNDS (Class 532, Subclass 1) {3}
1  DF  .~ HEAVY METAL CONTAINING (e.g., Ga, In or T1, etc.) {19}
138  DF  .~.~ Iron, cobalt, or nickel containing (Fe, Co, or Ni) {3}
140  DF  .~.~.~ Carbon bonded directly to the metal {2}
143.~.~.~.~ Plural unsaturated five-membered carbocyclic rings bonded directly to the metal (e.g., ferrorcenes, bis indenyl iron, etc.) {1}
144  DF  .~.~.~.~.~> Chalcogen, nitrogen or halogen containing {1}

DEFINITION

Classification: 556/143

(under subclass 140) Compounds wherein at least two unsaturated five-membered carbocyclic rings are bonded directly to the metal.

(1) Note. Examples of compounds provided for herein are: [figure] [figure] [figure]