SiliCycle SiliaBond Functionalised Silica Gel

• Fast Kinetics: Since the silica is surface functionalised, the rate of reaction is not controlled by the diffusion in and out of the polymer. Most of our scavengers work under an hour.
• Solvent Independent: Silica neither shrinks nor swells in any solvent and because it is endcapped, it will not dissolve in any solvent. The SiliaBond does not dictate the solvent of your reaction.
• Easy to Use: Easy to weigh and handle since silica does not carry a static charge and is always free flowing. Its high density makes it suitable for small volume work. It does not require extensive washing for high recoveries, and will not stick to glassware. It is amenable to automation.
• Mechanically Stable: Works well with overhead stirring and can be used with a bottom coupled spin bar for up to four hours.
• Thermally Stable: Most SiliaBond can withstand temperatures of over 200°C and are suitable for use in microwave synthesizers.
• Easily Scalable: Works on the microgram to the multi-ton scale.
• Flexible Formats: Because it does not swell, silica gel can be packed into a variety of flow through formats such as HPLC columns, flash and SPE cartridges, and 96 well plates.
• Controlled Loading: Consistent and accurate loading (lot-to-lot).

SiliaBond Glycidoxy (Si-GLY) may be used as a linker for further modification of the surface and for the immobilisation of molecules bearing amino, hydroxy, mercapto and thio-carboxylic acid groups

SiliaBond Pyridine (Si-PYR)  can be used as a tertiary amine for acid removal. It can also anchor Cu²⁺ ions and then be used as a catalyst for hydroquinone oxidation

SiliaBond Dimethylamine is a silica bound tertiary amine base that can be used in most applications requiring a tertiary amine, particularly as a HCl sponge. Silica bound ammonium salt by-products are easily separated by filtration. This dimethylamine immobilised on silica gel can be used as a base catalyst in Michael or Knoevenagel reactions. It can also be used as a catalyst for alkane oxidation.

SiliaBond Propylsulfonic Acid (SCX-2) - Strong acid widely used in different fields of synthetic organic chemistry. Among these applications, we denote their uses as acid catalysts, stationary phases for ion chromatography and basic impurity scavengers. The most common use is probably as a strong cation exchanger (SCX) for the amine "Catch and Release" purification technique in SPE cartridges.

SiliaBond Amine (Si-NH₂) is an effective scavenger of acid chlorides, sulfonyl chlorides, isocyanates and other electrophiles. Si-NH₂ has been shown to be effective metal scavenger and catalyst for Knoevenagel reactions. SiliaBond Amine is also used in chromatography as normal phase sorbent.

SiliaBond Allyl (Si-Allyl) can be used as solid support for further derivatisation.

SiliaBond Bromophenyl (Si-BRP) can be used as solid support for further derivatisation.

SiliaBond Propyl Bromide (Si-PBR) is a versatile solid support for amines and alcohols. It is more reactive than the chloride towards displacement.

SiliaBond Phenylmethylchloride (Si-PMC) can be used as solid support for further derivatisation.

SiliaBond Piperazine (Si-PPZ) is a useful deprotecting and scavenging agent for Fmoc1 and Bsmoc2 amino protecting groups and as a solid phase Knoevenagel catalyst. According to the results of a study, Si-PPZ is superior to its polystyrene based equivalent. SiliaBond Piperazine may also be used to scavenge electrophiles.

SiliaBond Tosic Acid (SiliaBond SCX, Si-TsOH) is a versatile bound strong acid with a pK_a <<1, widely used for the scavenging of amines and other basic functionalities, including weakly basic anilines, borohydrides, and metals such as Ni and Ag. It can also be used as an acid catalyst for organic reactions. Si-TsOH can serve as an alternative method to quench reactions instead of aqueous or organic soluble acids.

SiliaBond Carbonate (Si-CO₃) is the silica bound equivalent of tetramethyl ammonium carbonate. It can be used as a general base to quench a reaction, to free base amines in their ammonium salt form and to scavenge acids and acidic phenols, including HOBt, which is widely used in amide coupling reactions.

SiliaBond Morpholine (Si-MOR) is commonly used as an acid sponge. It is used in the same manner as morpholine functionalised polymers.

SiliaBond Carboxylic Acid (Si-CAA) can be used as a scavenger for amines or carbonates, and for the quench of alkoxides and organometallic reagents. SiliaBond Carboxylic Acid is primarily used as a weak cation exchanger (WCX) in solid phase extraction (SPE) and in HPLC.

SiliaBond Piperidine (Si-PIP) is a general purpose tertiary amine base to scavenge acids, thereby avoiding salt elimination problems. Also used as a base catalyst for Knoevenagel condensation.

SiliaBond DMAP (Si-DMAP) is the supported equivalent of 4-dimethylaminopyridine commonly used as a nucleophilic catalyst in a wide variety of reactions such as acylation, amidation or acetylation.

SiliaBond Triethylamine (SiliaBond WAX-2) is a silica bound tertiary amine base and can be used in most applications requiring a tertiary amine, particularly as a HCl sponge. SiliaBond Triethylamine is also used as weak anion exchanger (WAX) in SPE.

SiliaBond BTMA Chloride is mainly used as strong anion exchanger (SAX) in ion chromatography and ion exchange SPE. The function bears a positive charge across the whole pH range as well as in organic solvents. It is especially used for the “Catch and Release” purification of weak acids.

SiliaBond Guanidine is a silica supported diisopropylguanidine ligand. It is a very powerful scavenger for the chelating of organic acids in general, especially boronic acids and phenolic acids. It may also be used as a very strong base. It is sufficiently basic to deprotonate moderately acidic hydrogens, as in the alkylation of amines and phenols (Williamson ether synthesis) and the esterification of carboxylic acids using alkyl halides.

SiliaBond TMA Acetate - Strong anion exchangers (SAX) have been widely used in both chromatography and ion exchange SPE to selectively bind acidic drugs and/or analytes. In particular, weakly acidic compounds can be effectively extracted as those types of sorbents retain a permanent positive charge across the pH range. Most commercially available silica based SAX sorbents are produced with a high selectivity chloride counter ion which reduced retention of acidic drugs when compared with lower selectivity counter ions such as acetate.

SiliaBond TMA Chloride (SiliaBond SAX, Si-TMACl) is mainly used as strong anion exchanger (SAX) in ion chromatography and ion exchange SPE. The function bears a positive charge across the whole pH range as well as in organic solvents. It is especially used for the “Catch and Release” purification of weak acids.

SiliaBond Diphenylphosphine (Si-DPP) can be used as linker for catalyst immobilisation such as tetrakis-(triphenylphosphine)palladium(0) for Suzuki coupling.

SiliaBond Propyl Chloride can be used as solid support for further derivatisation.