Patents by Inventor Steven A. Roman

Steven A. Roman has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).

  • Oxyimino-substituted (1R, trans)-cyclopropanecarboxylic acids and derivatives thereof
    Patent number: 4254277
    Abstract: (1R, Trans)-cyclopropane compounds, substantially free of other stereoisomers, and having the formula ##STR1## wherein X is chlorine, bromine or OR in whichR is hydrogen, a salt-forming cation, an alkyl group or residues of certain other alcohols; andR.sup.1 is certain optionally halogenated hydrocarbyl groups, are highly active pesticides or intermediates therefore.
    Type: Grant
    Filed: December 20, 1979
    Date of Patent: March 3, 1981
    Assignee: Shell Oil Company
    Inventors: Steven A. Roman, Samuel B. Soloway
  • Cyclopropanecarboxylate pesticides
    Patent number: 4241081
    Abstract: Compounds of the formula ##STR1## wherein R.sup.1 is an acyl group or certain optionally halo-substituted hydrocarbyl groups, and X is --CH.sub.2 CH(OCH.sub.3).sub.2, --CH.sub.2 CHO, --CH.dbd.CHOR.sup.2 in which R.sup.2 is acyl,--CHO,--C(O)Cl, --C(O)Br or --C(O)OR in which R is H, a salt-forming cation, an alkyl group or the residue of a pyrethroid alcohol are new pesticides or intermediates therefore. The compounds are prepared using a multi-step synthesis starting from the natural terpene, 3-carene.
    Type: Grant
    Filed: July 23, 1979
    Date of Patent: December 23, 1980
    Assignee: Shell Oil Company
    Inventor: Steven A. Roman
  • Oxyimino-substituted cyclopropanecarboxylate pesticides
    Patent number: 4237123
    Abstract: New cyclopropane compounds have the formula ##STR1## wherein X is chlorine, bromine or OR in whichR is hydrogen, a salt-forming cation, an alkyl group or residues of certain other alcohols; andW is thienyl, furfuryl, --CO.sub.2 R.sup.1, --CONR.sup.1 R.sup.2, --SO.sub.3 R.sup.1, --SO.sub.2 NR.sup.1 R.sup.2, --PO.sub.3 H, --PO(OR.sup.1).sub.2, --NO.sub.2, --CN, --OR.sup.1, --SR.sup.1, --S(O)R.sup.1, --S(O).sub.2 R.sup.1, --NR.sup.1 R.sup.2, --N(O)R.sup.1 R.sup.2, or --(OCH.sub.2 CH.sub.2).sub.q --OR.sup.1 in which R.sup.1 and R.sup.2 are H or certain optionally-substituted hydrocarbyl groups, q is 1--4, p is 1 or 2 and when p is 1 then W.sup.1 is alkyl or when p is 2 then W.sup.1 is H. The compounds are pesticides or intermediates therefore.
    Type: Grant
    Filed: June 25, 1979
    Date of Patent: December 2, 1980
    Assignee: Shell Oil Company
    Inventor: Steven A. Roman
  • Hydrazono-substituted cyclopropanecarboxylate pesticides
    Patent number: 4237163
    Abstract: Cyclopropane compounds having the formula ##STR1## wherein X is chlorine, bromine or OR in whichR is hydrogen, a salt-forming cation, an alkyl group or residues of certain other alcohols andR.sup.1 and R.sup.2 each independently is hydrogen, or certain hydrocarbyl groups,are pesticides or intermediates therefore.
    Type: Grant
    Filed: June 11, 1979
    Date of Patent: December 2, 1980
    Assignee: Shell Oil Company
    Inventor: Steven A. Roman
  • Insecticidal sulfonium salts
    Patent number: 4230863
    Abstract: Novel insecticidal sulfonium salts of 2-(alkylthio)ethyl esters of .alpha.-nitro-.alpha.-1-azacycloalk-2-ylidene) acetic acid.
    Type: Grant
    Filed: June 2, 1975
    Date of Patent: October 28, 1980
    Assignee: Shell Oil Company
    Inventor: Steven A. Roman
  • 3-(Hydrocarbylthiomethyl)-2,2-dimethyl-cyclopropanecarboxylate pesticides and their preparation
    Patent number: 4223155
    Abstract: Compounds of the formula ##STR1## wherein R.sup.1 is an optionally halo-substituted hydrocarbyl group, and X is --C(O)Cl, --C(O)Br or C(O)OR in which R is H, a salt-forming cation, an alkyl group or the residue of a pyrethroid alcohol are new pesticides or intermediates therefore. The compounds are prepared using a multi-step synthesis starting from the neutral terpene, 3-carene.
    Type: Grant
    Filed: July 26, 1979
    Date of Patent: September 16, 1980
    Assignee: Shell Oil Company
    Inventor: Steven A. Roman
  • 3-(Hydrocarbylthiomethyl)-2,2-dimethylcyclopropanecarboxylate pesticides
    Patent number: 4219562
    Abstract: Compounds of the formula ##STR1## wherein R.sup.1 is an optionally halo-substituted hydroxcarbyl group, and X is --C(O)Cl, --C(O)Br or C(O)OR in which R is H, a salt-forming cation, an alkyl group or the residue of a pyrethroid alcohol are new pesticides or intermediates therefore. The compounds are prepared using a multi-step synthesis starting from the natural terpene, 3-carene.
    Type: Grant
    Filed: March 8, 1979
    Date of Patent: August 26, 1980
    Assignee: Shell Oil Company
    Inventor: Steven A. Roman
  • Oxyimino-substituted cyclopropanecarboxylate pesticides
    Patent number: 4219565
    Abstract: A cyclopropane compound having the formula ##STR1## wherein R is a residue of certain alcohols; andR.sup.1 is hydrogen, or certain optionally halogenated hydrocarbyl groups,are highly active pesticides.
    Type: Grant
    Filed: June 26, 1979
    Date of Patent: August 26, 1980
    Assignee: Shell Oil Company
    Inventor: Steven A. Roman
  • 6,6-Dimethyl-3-thiabicyclo[3.1.0]hexan-2-one
    Patent number: 4219658
    Abstract: Compounds of the formula ##STR1## wherein R.sup.1 is an optionally halo-substituted hydrocarbyl group, and X is --C(O)Cl, --C(O)Br or C(O)OR in which R is H, a salt-forming cation, an alkyl group or the residue of a pyrethroid alcohol are new pesticides or intermediates therefore. The compounds are prepared using a multi-step synthesis starting from the natural terpene, 3-carene.
    Type: Grant
    Filed: July 26, 1979
    Date of Patent: August 26, 1980
    Assignee: Shell Oil Company
    Inventor: Steven A. Roman
  • Preparation of 2,2-dimethyl-3-((oxyimino)methyl)cyclopropanecarboxylic acids
    Patent number: 4218402
    Abstract: 2,2-Dimethyl-3-((oxyimino)methyl)cyclopropanecarboxylic acids are prepared by treating the mixed anhydride of acetic and caronaldehydic acids with an acid addition salt of a hydroxylamine or of a hydrocarbyloxylamine followed by hydrolysis of the oxyimino-substituted product thereby obtained.
    Type: Grant
    Filed: July 16, 1979
    Date of Patent: August 19, 1980
    Assignee: Shell Oil Company
    Inventor: Steven A. Roman
  • Oxyimino-substituted (1R,trans)-cyclopropanecarboxylate pesticides
    Patent number: 4211792
    Abstract: (1R,trans)-cyclopropane compounds, substantially free of other stereoisomers, and having the formula ##STR1## wherein X is chlorine, bromine or OR in whichR is hydrogen, a salt-forming cation, an alkyl group or residues of certain other alcohols; andR.sup.1 is certain optionally halogenated hydrocarbyl groups, are highly active pesticides or intermediates therefore.
    Type: Grant
    Filed: February 21, 1979
    Date of Patent: July 8, 1980
    Assignee: Shell Oil Company
    Inventors: Steven A. Roman, Samuel B. Soloway
  • Oxyimino-substituted (1R,cis)-cyclopropanecarboxylate pesticides
    Patent number: 4211789
    Abstract: (1R,cis)-cyclopropane compounds, substantially free of other stereoisomers, and having the formula ##STR1## wherein R is the residue of certain alcohols; andR.sup.1 is hydrogen, or certain optionally halogenated hydrocarbyl groups, are highly active pesticides.
    Type: Grant
    Filed: February 21, 1979
    Date of Patent: July 8, 1980
    Assignee: Shell Oil Company
    Inventors: Steven A. Roman, Samuel B. Soloway
  • Cyclopropylmethanol pesticide
    Patent number: 4209642
    Abstract: Compounds of the formula ##STR1## wherein R.sup.1 is an acyl group or certain optionally halo-substituted hydrocarbyl groups, and X is --CH.sub.2 CH(OCH.sub.3).sub.2, --CH.sub.2 CHO, --CH.dbd.CHOR.sup.2 in which R.sup.2 is acyl, --CHO, --C(O)Cl, --C(O)Br or --C(O)OR in which R is H, a salt-forming cation, an alkyl group or the residue of a pyrethroid alcohol are new pesticides or intermediates therefore. The compounds are prepared using a multi-step synthesis starting from the natural terpene, 3-carene.
    Type: Grant
    Filed: March 15, 1979
    Date of Patent: June 24, 1980
    Assignee: Shell Oil Company
    Inventor: Steven A. Roman
  • Mixed anhydride of acetic acid and (1R,cis)-caronaldehydic acids
    Patent number: 4156692
    Abstract: The mixed anhydride of acetic and (1R,cis)-caronaldehydic acids is a new and useful chemical intermediate.
    Type: Grant
    Filed: October 16, 1978
    Date of Patent: May 29, 1979
    Assignee: Shell Oil Company
    Inventor: Steven A. Roman
  • Enol lactone intermediate for the preparation of (1R,cis)-caronaldehydic acid
    Patent number: 4132717
    Abstract: (1R,cis)-caronaldehydic acid is prepared from (+)-.DELTA..sup.3 -carene by a multistep process in which the (+)-.DELTA..sup.3 -carene derivative, (1R,cis)-2,2-dimethyl-3-(2-oxopropyl)cyclopropane-1-carboxylic acid, is cyclodehydrated, the resulting novel intermediate enol lactone is treated with ozone, the resulting ozonide is subjected to reductive cleavage to afford the mixed anhydride of the open form of (1R,cis)caronaldehydic acid and this mixed anhydride is hydrolyzed to the desired product. The intermediate enol lactone is a new compound.
    Type: Grant
    Filed: August 9, 1977
    Date of Patent: January 2, 1979
    Assignee: Shell Oil Company
    Inventor: Steven A. Roman
  • Derivatives of 3-oxomethyl-2-(1-nitro-2-oxoethylidene)-tetrahydro-2H-1,3-thiazines as insecticides
    Patent number: 4076813
    Abstract: Novel compounds defined in the title, useful as insecticides.
    Type: Grant
    Filed: January 14, 1977
    Date of Patent: February 28, 1978
    Assignee: Shell Oil Company
    Inventors: Steven A. Roman, James E. Powell
  • Esters of derivatives of 2-imidazolidinylidenenitroacetic acid
    Patent number: 4052411
    Abstract: Herbicidal compounds of the formula ##STR1## wherein R and R.sup.1 each is alkyl of from one to twenty carbon atoms and R.sup.2 is 2,4-dichloro-, 2-methyl-4-chloro- or 2,4,5-trichlorophenyl.
    Type: Grant
    Filed: October 6, 1976
    Date of Patent: October 4, 1977
    Assignee: Shell Oil Company
    Inventor: Steven A. Roman
  • Esters of nitro(tetrahydro-2H-1,3-thiazin-2-ylidene)acetic acid
    Patent number: 4049652
    Abstract: Novel insecticidal esters of nitro(tetrahydro-2H-1,3-thiazin-2-ylidene)acetic acid.
    Type: Grant
    Filed: July 19, 1976
    Date of Patent: September 20, 1977
    Assignee: Shell Oil Company
    Inventor: Steven A. Roman
  • Esters of nitro(tetrahydro-2H-1,3-thiazin-2-ylidene)acetic acids
    Patent number: 4045434
    Abstract: Novel insecticidal esters of nitro(tetrahydro-2H-1,3-thiazin-2-ylidene)acetic acids.
    Type: Grant
    Filed: July 19, 1976
    Date of Patent: August 30, 1977
    Assignee: Shell Oil Company
    Inventor: Steven A. Roman
  • Use as insecticides of esters of nitro(tetrahydro-2H-1,3-thiazin-2-ylidene)acetic acids
    Patent number: 4045559
    Abstract: Use as insecticides of esters of nitro(tetrahydro-2H-1,3-thiazin-2-ylidene)acetic acids.
    Type: Grant
    Filed: March 11, 1976
    Date of Patent: August 30, 1977
    Assignee: Shell Oil Company
    Inventor: Steven A. Roman