Abstract: The invention provides herbicidally-active 2,3-dihydro-5-cyanobenzofurans of the formula: ##STR1## (wherein: R.sup.1 and R.sup.2 together represent .dbd.O or R.sup.1 represents hydrogen and R.sup.2 represents hydrogen, hydroxy, alkoxy, acyloxy, alkoxycarbonyloxy, alkylthiocarbonyloxy, halogen, isothiocyanato, amino, alkylamino, dialkylamino, arylamino, acylamino, alkoxycarbonylamino, alkylthiocarbonylamino, N-bonded heterocyclyl, cyano or alkylthio; R.sup.3 and R.sup.4 together represent alkylene or each represent hydrogen or alkyl; and R.sup.5, R.sup.6 and R.sup.7, which may be the same or different, each represent hydrogen, halogen, alkyl, alkoxy, acyl or cyano), processes for their preparation and herbicidal compositions containing them.
Type:
Grant
Filed:
July 27, 1979
Date of Patent:
April 21, 1981
Assignee:
Fisons Limited
Inventors:
Peter S. Gates, Derek Baldwin, Carol A. Wilson, John Gillon
Abstract: This invention discloses new compounds of the formula ##STR1## wherein X,Y,Z and Q are each independently selected from the group consisting of oxygen and sulfur; R.sup.1 is selected from the group consisting of alkyl, and ##STR2## wherein A may be different at different positions and is selected from the group consisting of alkyl, alkoxy, alkylthio, halogen, nitro and cyano, p is an integer from 0 to 5; R.sup.2 is selected from the group consisting of alkyl, alkoxy, alkylthio, amino, alkylamino, dialkylamino and ##STR3## wherein B may be different at different positions and is selected from the group consisting of alkyl, alkoxy, alkylthio, halogen, nitro and cyano, and q is an integer from 0 to 5; R.sup.3 is selected from the group consisting of hydrogen, alkyl and ##STR4## wherein D may be different at different positions and is selected from the group consisting of alkyl, alkoxy, alkylthio, halogen, nitro and cyano, and r is an integer from 0 to 5; R.sup.
Abstract: A process is provided for the continuous or semi-continuous production of hetero-macrocyclic compounds including lactones and cyclic esters. The process involves the catalyzed depolymerization of linear polyesters at elevated temperature and under reduced pressure in the presence of a specified amount of monocarboxylate moieties while providing top-to-bottom mixing throughout essentially the total volume of the reaction mass.
Abstract: Isochromans, isothiochromans, 2-benzoxepins, and 2-benzothiepins are described. These compounds are useful for preparing corresponding amino derivatives that possess antihypertensive and CNS activity.
Abstract: A process is provided for the continuous or semi-continuous production of hetero-macrocyclic compounds including lactones and cyclic esters. The process involves the catalyzed depolymerization of a linear polyester at an elevated temperature and under reduced pressure in the presence of a specified amount of monocarboxylate moieties and while providing top-to-bottom mixing throughout essentially the total volume of the reaction mass.