US PATENT SUBCLASS 556 / 21
.~.~.~.~.~ Exactly three carbons bonded directly to the phosphorus (e.g., triphenylphosphines, 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}
13  DF  .~.~ Phosphorus containing {6}
19  DF  .~.~.~ Carbon bonded directly to the phosphorus {1}
20  DF  .~.~.~.~ Plural carbons bonded directly to the phosphorus {1}
21.~.~.~.~.~ Exactly three carbons bonded directly to the phosphorus (e.g., triphenylphosphines, etc.) {2}
22  DF  .~.~.~.~.~.~> And carbon bonded directly to the heavy metal
23  DF  .~.~.~.~.~.~> Hydrogen or halogen bonded directly to the heavy metal

DEFINITION

Classification: 556/21

(under subclass 20) Compounds wherein exactly three carbons are bonded directly to the phosphorus.

(1) Note. An example of a compound provided for herein is: [figure]