US PATENT SUBCLASS 558 / 349
.~.~.~.~ On benzene ring (e.g., benzonitrile from benzene, etc.)

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

*  DD  ORGANIC COMPOUNDS (Class 532, Subclass 1) {21}
303  DF  .~ Nitriles (i.e., compounds having cyano bonded directly to carbon, which carbon may be single bonded to any atom but may be multiple bonded only to carbon) {21}
332  DF  .~.~ Processes of attaching cyano to carbon by reaction of an inorganic cyanide with an organic compound (e.g., using HCN, cyanogen, metal cyanide, ammonium cyanide, cyanogen chloride, etc.) {10}
348  DF  .~.~.~ Replacing hydrogen with cyano (e.g., malononitrile from acetonitrile, etc.) {1}
349.~.~.~.~ On benzene ring (e.g., benzonitrile from benzene, etc.)

DEFINITION

Classification: 558/349

(under subclass 348) Processes wherein cyano replaces hydrogen bonded directly to a benzene ring.

(1) Note. An example of prosess provided for herein is: the production of phthalonitrile by the reaction of benxonitrile and HCN in the presence of a tungsten catalyst.