7-(4-nitrophenoxy)-2,4,4-trimethyl-4H-1-benzopyran 、 甲醇 在
甲醇 作用下,
以
甲苯 为溶剂,
反应 4.5h,
以to give 6.7 g (90%) of the desired product as a white powder (melting point 125° C.)的产率得到2,3-dihydro-2-methoxy-7-(4-nitrophenoxy)-2,4,4-trimethyl-4H-1-benzopyran
参考文献:
名称:
Aromatic urea derivatives and their use as herbicide
NOVEL UREA DERIVATIVES, PROCESSES FOR PRODUCTION THEREOF AND HERBICIDE
申请人:MITSUI PETROCHEMICAL INDUSTRIES, LTD.
公开号:EP0230475B1
公开(公告)日:1992-03-18
US4838924A
申请人:——
公开号:US4838924A
公开(公告)日:1989-06-13
Aromatic urea derivatives and their use as herbicide
申请人:Mitsui Petrochemical Industries, Ltd.
公开号:US04838924A1
公开(公告)日:1989-06-13
This invention relates to novel compounds of formula [I], a process for their production, and their use as a herbicide. ##STR1## wherein A represents the bond ##STR2## in which X is a hydrogen atom, a chlorine atom, a nitro group or a trifluoromethyl group; B represents a hydrogen atom, a methyl group or a methoxy group; and Ar represents one member selected from the group consisting of ##STR3## in which R.sup.1 to R.sup.38, are as defined hereinafter.