Having -c(=x)-, Wherein X Is Chalcogen, Bonded Directly To The Hetero Ring Patents (Class 549/483)
The -c(=x)- is part of a -c(=x)x- group, wherein the x's are the same or diverse chalcogens (Class 549/484)
Nitrogen bonded directly to the -c(=x)- group (Class 549/487)
Additional chalcogen attached indirectly to the hetero ring by nonionic bonding (Class 549/488)
Preparation of furfural (i.e., furan-2-aldehyde) (Class 549/489)
Purification or recovery of furfural (Class 549/490)
  • Process for the production of caboxylic acid cyanides
    Patent number: 4339591
    Abstract: There are produced carboxylic acid cyanides, e.g., acyl cyanides by reacting a carboxylic acid halide with an alkali cyanide or hydrogen cyanide in the presence of a copper (I) salt and a carboxylic acid nitrile. Especially advantageous are glutaric acid dinitrile and 2-methyl glutaric acid dinitrile.
    Type: Grant
    Filed: March 23, 1981
    Date of Patent: July 13, 1982
    Assignee: Degussa Aktiengesellschaft
    Inventors: Axel Kleemann, Bernd Lehmann, Herbert Klenk
  • Process for producing 5-methylfurfural
    Patent number: 4335049
    Abstract: A process for producing 5-methylfurfural by reducing 5-chloromethylfurfural which is used as a starting material or to be obtained by decomposing glucides commercially available more cheaply with hydrochloric acid, with hydrogen in an organic solvent in the presence of a palladium catalyst.
    Type: Grant
    Filed: June 30, 1981
    Date of Patent: June 15, 1982
    Assignee: Sumitomo Chemical Company, Limited
    Inventors: Kazuhiko Hamada, Goufu Suzukamo, Koichi Fujisawa