Patent number: 6175007
Abstract: Phosphonic acid compounds I
wherein
Eth is optionally substituted 1,2-ethynediyl, ethanediyl or ethene-1,2-diyl;
Y1 is oxygen or sulfur;
Y2 is oxygen, sulfur or —N(R6)—;
Y3 is oxygen, sulfur or —N(R7)—;
R1, R2, R6 and R7 are hydrogen or
optionally substituted alkyl, alkenyl, alkynyl, cycloalkyl, phenyl or heterocyclyl, or
R1 and R2, R1 and R6, R2 and R7 together are optionally substituted 1,2-ethanediyl, 1,3-propylene, tetramethylene, pentamethylene or ethyleneoxyethylene, or
R1 and R2 together are optionally substituted 1,2-phenylene;
R3 is cyano, halogen, alkyl, haloalkyl, alkoxy or haloalkoxy;
R4 is hydrogen or halogen, and
R5 is a heterocycle &PHgr;1 to &PHgr;22 as defined in the specification,
their manufacture and intermediates therefore. The phosphonic acid compounds are effective against unwanted plants and act as desiccants and defoliants.
Type:
Grant
Filed:
August 4, 1998
Date of Patent:
January 16, 2001
Assignee:
BASF Aktiengesellschaft
Inventors:
Cyrill Zagar, Elisabeth Heistracher, Olaf Menke, Gerhard Hamprecht, Markus Menges, Peter Sch{umlaut over (a)}fer, Karl-Otto Westphalen, Ulf Misslitz, Helmut Walter
