George C Chiang

US Patent:

6737383, May 18, 2004

Filed:

Jun 29, 2001

Appl. No.:

09/869771

Inventors:

Gary David Annis - Landenberg PA
George Chih-Shu Chiang - Wilmington DE
David Raymond Forney - Elkton MD
Kanu Maganbhai Patel - Wilmington DE
Morris Padgett Rorer - Newark DE
Thomas Martin Stevenson - Newark DE
Chi-Ping Tseng - Wilmington DE

Assignee:

The Regents of the University of California - Oakland CA

International Classification:

C07D27107

US Classification:

504265, 548132

Abstract:

Compounds of Formula (1) and processes for their preparation, their N-oxides and agriculturally suitable salts, are disclosed which are useful for controlling undesired vegetation wherein Q, X , X , X , R , R , R and R are as defined in the disclosure. Also disclosed are novel intermediates of Formula (5), Formula (8) and Formula (20) wherein R is â(CR R ) âQ; R , R , q, Q, X and X are as defined in the disclosure. Also disclosed are compositions containing the compounds of Formula (1) and a method for controlling undesired vegetation which involves contacting the vegetation or its environment with an effective amount of a compound of Formula (1).

US Patent:

20040063581, Apr 1, 2004

Filed:

Aug 4, 2003

Appl. No.:

10/634706

Inventors:

Gary Annis - Landenberg PA, US
George Chiang - Wilmington DE, US
David Forney - Elkton MD, US
Kanu Patel - Wilmington DE, US
Morris Rorer - Newark DE, US
William Smith - Elkton MD, US
Thomas Stevenson - Newark DE, US
Chi-Ping Tseng - Wilmington DE, US

Assignee:

The Regents of the University of California

International Classification:

A01N043/72
A01N043/84
A01N043/60
A01N043/82

US Classification:

504/221000, 504/225000, 504/235000, 504/265000

Abstract:

Compounds of Formula (1) and processes for their preparation, their N-oxides and agriculturally suitable salts, are disclosed which are useful for controlling undesired vegetation wherein Q, X, X, X, R, R, Rand Rare as defined in the disclosure. Also disclosed are novel intermediates of Formula (5), Formula (8) and Formula (20) wherein Ris —(CRR)Q; R, R, q, Q, Xand Xare as defined in the disclosure. Also disclosed are compositions containing the compounds of Formula (1) and a method for controlling undesired vegetation which involves contacting the vegetation or its environment with an effective amount of a compound of Formula (1).

US Patent:

48868817, Dec 12, 1989

Filed:

May 12, 1989

Appl. No.:

7/351102

Inventors:

George C. Chiang - Wilmington DE
Masuo Toji - Sewell NJ

Assignee:

E. I. Du Pont de Nemours and Company - Wilmington DE

International Classification:

C07D25116
C07D25142

US Classification:

544194

Abstract:

Process for preparing aminotriazines wherein it is not necessary to make any separations before completing the preparation. The process of the invention involves reacting dicyandiamides with trimethylorthoacetate in the presence of a catalyst to form aminotriazines.

US Patent:

55502385, Aug 27, 1996

Filed:

Aug 23, 1995

Appl. No.:

8/518435

Inventors:

George C. Chiang - Wilmington DE
Richard F. Davis - Newark DE
Kwaku O. Temeng - Wilmington DE

Assignee:

E. I. Du Pont de Nemours and Company - Wilmington DE

International Classification:

C07D25142
C07D25148
C07D23942
C07D23948

US Classification:

544211

Abstract:

This invention relates to a process for preparing sulfonylureas comprising reacting a sulfonyl chloride with a cyanate salt and an amine base in the presence of an inert aprotic solvent to give an isocyanate complex which is then reacted with an amino heterocycle to form the sulfonylurea product and a process for converting the crystal form of the prepared sulfonylurea product to a more stable crystal product form.

US Patent:

49334506, Jun 12, 1990

Filed:

Jun 29, 1989

Appl. No.:

7/373073

Inventors:

George C. Chiang - Wilmington DE

Assignee:

E.I. du Pont de Nemours and Company - Wilmington DE

International Classification:

C07D25116

US Classification:

544194

Abstract:

A metal. dicyanimide. ligand complex having the formula M[N(CN). sub. 2 ]. sub. 2. ligand. sub. 2 wherein M is Zn, Cu, Mg, Ca, Fe, Al or Si and ligand is a group capable of donating a pair of electrons, a process for its preparation, and its use in the preparation of aminotriazines is disclosed.

US Patent:

51070570, Apr 21, 1992

Filed:

Jun 12, 1990

Appl. No.:

7/659413

Inventors:

George C. Chiang - Wilmington DE
Felix E. Granchelli - Arlington MA
Christopher Wright - Somerville MA

Assignee:

E. I. Du Pont de Nemours and Company - Wilmington DE

International Classification:

C07D21312
C07D21356
C07D21362
C07C25507

US Classification:

546250

Abstract:

This invention relates to certain cyano-dienes and halopyridines and the processes for their preparation from a protected 1,3-dialdehyde and a cyano-diene.

US Patent:

H18090, Oct 5, 1999

Filed:

Apr 8, 1998

Appl. No.:

9/056689

Inventors:

Charles De Witt Adams - Newark DE
George Chihshu Chiang - Wilmington DE
Simon Lingqi Xu - Newark DE

Assignee:

E. I. du Pont de Nemours and Company - Wilmington DE

International Classification:

C07D24908

US Classification:

5482622

Abstract:

An advantageous process for preparing agriculturally suitable precursor compositions containing a compound of Formula IV is disclosed. The process involves (a) reacting a compound of Formula V with a nitrosating agent to provide a diazonium ion of Formula Va, (b) reacting the diazonium ion with a compound of Formula VI in the presence of a copper salt catalyst to obtain a reaction product containing the compound of Formula IV and greater than 100 ppm copper (based on the weight of Formula IV compound), and (c) separating copper from the Formula IV compound to obtain a purified product composition containing the compound of Formula IV and less than 10 ppm copper (based on the weight of Formula IV compound). ##STR1## A method for preparing a cyclic urea fungicides of Formula I is disclosed, which involves (1) preparing an agriculturally suitable precursor composition as indicated (2) reacting the oxime of Formula IV from said precursor composition with a compound of Formula III to provide a compound of Formula II, and (3) reacting the compound of Formula II with a compound of Formula MOR. sup. 1. ##STR2## Suitable R. sup. 1 -R. sup. 5, R. sup. 7, R. sup.

US Patent:

54400430, Aug 8, 1995

Filed:

Apr 19, 1994

Appl. No.:

8/229888

Inventors:

Charles D. Adams - Newark DE
Greg A. Bullock - Hockessin DE
George C. Chiang - Wilmington DE

Assignee:

E. I. Du Pont de Nemours and Company - Wilmington DE

International Classification:

C07D21355
C07D21356
C07D21357
C07D21380

US Classification:

546291

Abstract:

The present invention relates to novel substituted pyridine compounds useful as intermediates in the preparation of herbicidal compounds and the process for the preparation of said pyridine compounds.