Crystalline form of l-glufosinate ammonium salt and process for production thereof
AssigneeUpl Ltd
InventorsPrashant Vasant Kini, Chandrasekhar Dayal Mudaliar, Ashishkumar Ravindra Mishra, Santosh Ganpat Shelke
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Abstract
The present disclosure relates to a novel crystalline form of L-glufosinate ammonium salt and a process for preparation thereof. The present disclosure also provides compositions comprising said form and a method for the control of undesired plant growth using said compositions.
Claims22
A crystalline form of L-glufosinate ammonium salt characterized by one or more of
- an X-ray powder diffractogram pattern having peaks at 9.0, 11.6, 13.1, 14.1, 17.6, 18.2, 18.9, 19.5, 22.4, 23.4, 26.0, 31.1, 33.3 and 36.3 degree 20±0.2 degree 2θ;
- an X-ray powder diffractogram pattern having at least three peaks selected from the group consisting of 9.0, 11.6, 13.1, 14.1, 17.6, 18.2, 18.9, 19.5, 22.4, 23.4, 26.0, 31.1, 33.3 and 36.3 degree 2θ±0.2 degree 2θ;
- an X-ray powder diffractogram pattern substantially as depicted in FIG. 1;
- a differential Scanning Calorimetry thermogram having at least two characteristic thermal events in the range of 65-115° C., 185-210° C. and 210-235° C.;
- a differential Scanning Calorimetry thermogram substantially as depicted in FIG. 2;
- and
- combinations thereof.
A crystalline form of L-glufosinate ammonium, wherein the ratio of L-glufosinate to ammonium is in the range of 9.5-11:1.
A process for producing a compound of Formula (I)
- said process comprising:
- a) suspending an acid addition salt a compound of following Formula (II), wherein A− is an anion, in an alcohol solvent to form a suspension;
- b) contacting the suspension with gaseous ammonia until complete dissolution of the compound of Formula (II) to form a solution;
- and
- c) subjecting the solution to conditions to precipitate the compound of Formula (I).
A process for preparation of a compound of Formula (I) comprising:
- a) contacting a suspension comprising an acid addition salt compound of Formula (II), wherein A− is an anion, in an alcohol solvent with gaseous ammonia under nonaqueous conditions to form a solution;
- and
- b) subjecting the solution to conditions to precipitate the compound of Formula (I).
The process for producing the compound of Formula (I) according to claim wherein a ratio of the acid addition salt compound of Formula (II) to the alcohol is from about 1:5 to about 1:10 by weight.
L-glufosinate ammonium salt that is substantially free from an acid addition salt of L-glufosinate, and/or L-glufosinate.
L-glufosinate ammonium salt having a volume average particle size distribution D50 less than or equal to about 250 microns.
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An agrochemical composition comprising:
- i) a crystalline form of L-glufosinate ammonium salt;
- and
- ii) one or more agrochemically acceptable additive.
A method for control of undesired plant growth, comprising applying to the plants or their locus to the action a crystalline form of L-glufosinate ammonium salt.
Dependencies are inferred from the claim text.