Quick wins for a faster PC:
Fix the driver behind crashes, sound loss and screen glitchesFind Drivers →Repair Windows errors before they cause bigger problemsFix Now →Scan for outdated or missing drivers - takes under a minuteDriver Scan →A 2017 report described a click-chemistry strategy that uses thionyl tetrafluoride (SOF4) as a central sulfur hub. Rather than building a mainly linear connection through azide–alkyne coupling, the method adds different groups in sequence around sulfur, creating a tetrahedral arrangement with up to three connections from the hub.
How the sulfur-based method works
The reported process begins with SOF4 gas. Its sulfur center has fluorine atoms that can be displaced in a controlled sequence through sulfur(VI) fluoride exchange, or SuFEx, chemistry. The sequence allows researchers to attach different functional groups to one central point rather than joining components only end to end.
As an Amazon Associate I earn from qualifying purchases.
First connection: a primary amine
A primary amine can displace two fluorine atoms in the presence of a tertiary amine catalyst, forming the initial connection at the sulfur hub.
Adding a third group
A secondary amine, an amino acid, or a protected phenol can displace a third fluorine under basic catalysis. If the third group is a protected phenol, the remaining fluorine can then be displaced either by a secondary amine directly or by another protected phenol using a phosphazene base catalyst. These are reported reaction sequences, not a general recipe for every substrate.
#1 Best Overall
- 5-WAY WATER TESTING: Accurately tests chlorine, bromine, pH, acid demand, and total alkalinity to help maintain clean, balanced pool and spa water
- POOL & SPA CHEMICAL TEST KIT: Liquid reagent test kit supports routine swimming pool, hot tub, and spa water testing for better water care and maintenance
- EASY COLOR MATCHING: Clear-view comparator block with integrated color chips helps make pool water testing faster, easier, and more accurate
- COMPLETE LIQUID REAGENT KIT: Includes 1 oz. Solutions #1, #2, and #3, plus 1/2 oz. Solutions #4 and #5 for complete 5-way pool water testing
- 5-WAY PHENOL RED FORMULA: Solution #2 Phenol Red is formulated for 5-way test kits only and should not be substituted with 2-way or 3-way Phenol Red
What makes the linkage three-dimensional
The important distinction is the geometry: the attached groups extend from a tetrahedral sulfur center. The report presents this as a way to create up to three sequential connections from a single hub, offering a different arrangement from the more linear linkage commonly associated with azide–alkyne click chemistry. John Moses of the University of Nottingham described the result as three sequential reactions, each creating a unique connection, extending “from a single sulfur hub into the 3D world.”
The report called the sulfur(VI) fluoride compounds “sleeping beauties,” describing them as stable until exposure to tertiary amines, which can initiate controlled reactions. That phrase characterizes the researchers’ account; it is not a general guarantee of stability, safe handling, or suitability for storage.
Rank #2
- Includes 1 each of R-0001, R-0002, R-0004
- 2 oz. bottles
- Prevents corrosion
- Taylor brand
- Liquid volume: 2 Fluid Ounces
Why chemists may find it useful
A central hub with several distinct connections could give chemists another way to assemble and modify complex molecules. The 2017 account identified biomolecule tagging, fragment-based drug discovery, and functional polymers as relevant research directions. Eric Anslyn of the University of Texas at Austin described the approach as an extension of click chemistry that could offer more controllable three-dimensional organization at the conjugating agent, and noted its potential relevance to assembling fragments around a single core.
What’s actually slowing this PC down?
Pick the symptom - the matching free tool is one click away.
These are prospective applications, not evidence of clinical use or commercial deployment. The report does not provide a full head-to-head performance dataset against conventional azide–alkyne methods, so it does not establish that the sulfur approach is faster, more efficient, or broadly preferable.
Rank #3
- Get the most accurate results possible
- Keep your pool water chemistry properly balanced
- It is recommended that you replace your reagents every year
Availability and safety context
Chemistry World reported in February 2017 that SOF4 was not commercially available at that time and that the research team was working with a Chinese company toward a ton-scale process. This is historical information, not a statement about current supply. Current commercial availability and applicable handling or regulatory restrictions are not established here; anyone considering the reagent would need up-to-date supplier and safety information.
Independent reader supportYour contribution helps us test, update, and keep practical guides available for everyone.Source and scope
The method was covered by Chemistry World in February 2017. The underlying paper is S. Li et al., Angewandte Chemie International Edition (2017), DOI 10.1002/anie.201611048. The account here follows the Chemistry World report rather than an independent examination of the paper.
Quick Recap
Best Value
- 3-WAY POOL & SPA WATER TESTING: Accurately test Total Chlorine, Total Bromine, and pH levels with one simple kit. Designed for residential swimming pools, hot tubs, and spas, this water testing kit works with both freshwater and saltwater systems to help maintain balanced, safe water.
- FAST & EASY TO USE: Get clear, reliable results in seconds. Simply collect a water sample using the included comparator, add the designated reagents, and match the color results. Use the step-by-step instructions with easy-to-follow diagrams to make testing simple.
- EXPERT-GRADE ACCURACY: Engineered to meet trusted industry standards for dependable results. Regular testing helps prevent cloudy water, skin irritation, and equipment damage by keeping your pool or spa chemistry properly balanced.
- COMPLETE TEST KIT INCLUDED: Each pool testing kit includes 1 x Heavy-duty plastic storage case, 1 x Instruction manual, 1 x Comparator, 1 x 0.67oz Orthotolidine reagent bottle & 1 x 0.67oz pH indicator solution bottle.
- DURABLE & LONG-LASTING: The East Bay Water Testing Kit offers enough materials for over 100 individual tests, providing enduring value and reliability for your water testing needs.
Rank #4
- Forensic Reagent Test Kit – Laboratory-grade chemical reagent designed to demonstrate color-change reactions for research, training, and harm-reduction education.
- Observe Clear Color Reactions – When you add the reagent to a sample, the liquid changes color.
- All-In-One Kit – Includes one dropper bottle of reagent, a reusable glass test tube, and a color reference chart for convenient, repeatable testing demonstrations.
- Safe & Responsible Use – Intended strictly for forensic, educational, and harm-reduction awareness purposes. Not for diagnostic or human consumption use.
- Made in Knoxville, Tennessee, USA – Proudly produced, bottled, and quality-checked by TN Scientific, a trusted harm-reduction laboratory supply company.
Product prices and availability are accurate as of the date/time indicated and are subject to change. Any price and availability information displayed on Amazon at the time of purchase will apply.
