Research Progress on the New Process of Sulfonyl Chloride Fragment in Pyraflufen-ethyl
1. Overview and Development History of Pyraflufen-ethyl
Pyraflufen-ethyl (trade names: Granite, Grasp, Daojie) is a highly effective broad-spectrum herbicide with the chemical name 3-(2,2-difluoroethoxy)-N-(5,8-dimethoxy-[1,2,4]triazolo[1,5-c]pyrimidin-2-yl)-α,α,α-trifluorotoluene sulfonamide. This compound was developed by Dow AgroSciences in the United States and completed formal registration with the U.S. Environmental Protection Agency (EPA) in September 2004. It began commercial promotion and application in southern rice areas of the United States in 2005 and received pesticide registration approval in China in 2008.
From a market performance perspective, pyraflufen-ethyl has shown strong growth momentum. Global sales data from 2013 indicated that total sales reached $255 million USD; among these, non-agricultural sector sales amounted to $140 million USD—surpassing traditional rice field applications. This shift reflects an expansion of pyraflufen-ethyl's application range into non-agricultural fields where it is often combined with fertilizers for enhanced weed control effects.
2. Application Characteristics and Market Distribution of Pyraflufen-ethyl
2.1 Herbicidal Properties and Applicable Scope
As a specialized broad-spectrum herbicide for rice paddies, pyraflufen-ethyl exhibits significant herbicidal activity with a long-lasting effect typically lasting between 30 to 60 days; one-time application can effectively control weeds throughout an entire growing season. The product is suitable for various rice cultivation modes including dry direct seeding and transplanted paddy fields while demonstrating excellent efficacy against all types of weeds.
In terms of weed control spectrum, pyraflufen-ethyl shows outstanding effectiveness against barnyard grass (including resistant varieties). Additionally, it effectively controls various broadleaf weeds such as water hyacinth flowers and other aquatic plants like sedges.
2.2 Crop Safety and Environmental Adaptability
Pyraflufen-ethyl demonstrates high safety levels towards rice crops even at excessive recommended dosages; any initial inhibitory effects are minor but recover quickly without impacting final yield significantly making it one of the preferred products for weeding rice paddies.
Globally speaking about its market distribution—pyraflufen ethyl has been widely applied across major world regions covering Europe Asia America Africa etc., primarily found within markets such as Argentina Austria Brazil China Chile Czech Republic Egypt France Germany Greece Indonesia Italy Japan Malaysia Pakistan Philippines Portugal Slovakia South Korea Spain Switzerland Turkey USA Vietnam etc..
3 Mechanism Of Action And Registration Information n **3 .1 Biochemical Mechanism Of Action ** n Pyraf luf en - eth yl belongs t o th e class o f tr iaz ol op yr im id ine s ul fo ny l am ide h er bi ci de s w ith ac ty la ct ic acid synthase( ALS )as its target enzyme which plays key roles i n synthesizing branched-chain amino acids(v aline leucine iso leu cine )in plants fungi bacteria ; however this metabolic pathway does not exist within animals thus providing high selectivity toward targeted species while being low toxicity toward mammals hence environmentally friendly nature overall . n **3 .2 Global Registration Status ** n According t o public registrati on information ,py rafl uf en - eth yl ha s b een wid ely registered globally . In Ch ina’s pesticide registration system multiple companies hold original drug registrations including Shandong Weifang Runfeng Chemical Jiangsu Hormone Research Institute Hebei Xingbai Agricultural Technology Huai’an Guorui Chemical Jiangsu Green Li Lai Jiangsu Fenghua Chemical Mudanjiang Baijiaxin Biotechnology Jiangxi Tianyu Chemical Hefei Xingyu Chemistry Zhejiang Tianfeng Biological Science amongst others whose certificates mostly extend until year2020 maintaining98% active ingredient standards respectively .. n ### Four Patent Status And Synthesis Process Advances ## 4 .1 Patent Expiration Situation## In Sep tember2017 patents protecting compounds were successively expired across Europe US &China marking entry into post-patent phase allowing legal space development generic products yet bringing fierce competition landscape ahead too.. ## 4 .2 Synthetic Route Analysis## The chemical synthesis mainly involves two critical fragments :amino dimethoxyt riazolopyrimidine specific sul fonyl chloride derivatives currently research improvements focus upon preparation methods concerning both segments involved herein .. For aminodimethoxyt riazo lo pyrimidine fragment literature reports several synthetic routes each having distinct characteristics regarding raw material selection reaction conditions yields relatively limited innovation potential facing lower risks infringing existing patents during this section therefore … ## 4 .3 Breakthroughs On Sulfonyl Chloride Segment Processes## Synthesis processes pertaining specifically onto sul fon yl chlor ide exhibit greater technological innovation opportunities wherein original patent methodologies employ two approaches : firstly US6433169 describes diazotization process facing challenges related high costs strict low temperature operational requirements unsatisfactory yields alongside safety concerns secondly Org.Process Res.Dev reported lithium bromide low-temperature lithiation route necessitating rigorous cold condition complexity controlling likewise yielding insufficient results similarly … Notably domestic enterprises achieved remarkable breakthroughs regarding segment synthesis techniques Nanjing Zhengrong Pharmaceutical utilized unique intermediates fluorination technologies developing entirely new process routes substantially reducing production costs enhancing efficiency yield rates thereby bolstering competitive advantages whilst remaining vigilant over possible infringement risks relevant technical details accessible via Chinese patent CN104693080A documentation.. ### Five Market Prospects Technical Development Recommendations As global paddy acreage stabilizes increasing demand arises surrounding herbicides promising expansive future prospects awaiting further exploration particularly emphasizing expansions beyond agricultural realms presenting novel growth avenues especially maintenance scenarios involving lawns livestock grounds clearing practices though heightened competition ensues following expiration period requiring preparedness optimizing procedures managing cost structures aligning intellectual property strategies adequately ... Enterprises aiming entering this domain advised focusing innovations optimizations surrounding synthesis processes additionally closely monitoring foundational company’s patent frameworks avoiding infringements risk furthermore developing new formulations combinations improving product competitiveness viable pathways navigating globalization landscapes necessitate attentiveness regulatory shifts occurring respective major paddy producing zones planning strategic approaches accordingly.
