Neue Sulfamidsäurehalogenide und Verfahren zur Herstellung von Sulfamidsäurehalogeniden
申请人:BASF Aktiengesellschaft
公开号:EP0007439B1
公开(公告)日:1982-07-28
US3969372A
申请人:——
公开号:US3969372A
公开(公告)日:1976-07-13
US4091033A
申请人:——
公开号:US4091033A
公开(公告)日:1978-05-23
Method of making 2-alkoxy-2,3-dihydro-benzofuran-5-ols and their alkyl
申请人:Fisons Limited
公开号:US04091033A1
公开(公告)日:1978-05-23
Compounds of the formula: ##STR1## wherein R.sub.1 and R.sub.2 are the same or different and each is selected from the group consisting of hydrogen, an alkyl group and together, an alkylene chain; M is alkyl of 1 to 6 carbon atoms; and R.sub.6 is selected from the group consisting of hydrogen and R.sub.5 SO.sub.2 -- wherein R.sub.5 is alkyl of 1 to 6 carbon atoms, are prepared by a procedure in which the key step is reacting benzoquinone with an enamine R.sub.1 R.sub.2 C.dbd.CHNR.sub.d 3 R.sub.4 in the presence of a compound of the formula R.sub.1 R.sub.2 CHCHO. The product contains a lower proportion of hydroquinone impurity and is useful as a herbicide.