US 12,435,044 B2
Pyridazinone herbicides and pyridazinone intermediates used to prepare a herbicide
Thomas Paul Selby, Hockessin, DE (US); Thomas Martin Stevenson, Newark, DE (US); Stephen Frederick McCann, Newark, DE (US); Eric Allen Marshall, Rising Sun, MD (US); and Yuzhong Chen, Wilmington, DE (US)
Assigned to FMC Corporation, Philadelphia, PA (US)
Appl. No. 17/280,611
Filed by FMC Corporation, Philadelphia, PA (US)
PCT Filed Sep. 26, 2019, PCT No. PCT/US2019/053053
§ 371(c)(1), (2) Date Mar. 26, 2021,
PCT Pub. No. WO2020/069057, PCT Pub. Date Apr. 2, 2020.
Claims priority of provisional application 62/737,894, filed on Sep. 27, 2018.
Prior Publication US 2022/0041560 A1, Feb. 10, 2022
Int. Cl. C07D 237/16 (2006.01); A01N 43/58 (2006.01); C07D 237/14 (2006.01)
CPC C07D 237/16 (2013.01) [A01N 43/58 (2013.01); C07D 237/14 (2013.01)] 17 Claims
 
1. A compound of Formula I and N-oxides or salts thereof,

OG Complex Work Unit Chemistry
wherein
R1 is C1-C4 alkyl or C3-C6 cycloalkyl;
R2 is Cl;
R3 is Cl or OR4;
R4 is H or C1-C4 alkyl;
R5 is F, Cl or CH3; and
R6 is H.