Tris((1-benzyl-4-triazolyl)methyl)amine (TBTA) is a tertiary amine containing the 1,2,3-triazole moiety. When used as a ligand, complexed to copper(I), it allows for quantitative, regioselective formal Huisgen 1,3-dipolar cycloadditions between alkynes and azides, in a variety of aqueous and organic solvents.

Tris(benzyltriazolylmethyl)amine

Names
Preferred IUPAC name 1-(1-Benzyl-1H-1,2,3-triazol-4-yl)-N,N-bis[(1-benzyl-1H-1,2,3-triazol-4-yl)methyl]methanamine
Identifiers
CAS Number	510758-28-8 Y
3D model (JSmol)	Interactive image
ChemSpider	9378431 Y
ECHA InfoCard	100.221.401
PubChem CID	11203363
UNII	TC4DSF6TA2 Y
CompTox Dashboard (EPA)	DTXSID20458589
InChI InChI=1S/C30H30N10/c1-4-10-25(11-5-1)16-38-22-28(31-34-38)19-37(20-29-23-39(35-32-29)17-26-12-6-2-7-13-26)21-30-24-40(36-33-30)18-27-14-8-3-9-15-27/h1-15,22-24H,16-21H2 Key: WKGZJBVXZWCZQC-UHFFFAOYSA-N Y InChI=1S/C30H30N10/c1-4-10-25(11-5-1)16-38-22-28(31-34-38)19-37(20-29-23-39(35-32-29)17-26-12-6-2-7-13-26)21-30-24-40(36-33-30)18-27-14-8-3-9-15-27/h1-15,22-24H,16-21H2 InChI=1S/C30H30N10/c1-4-10-25(11-5-1)16-38-22-28(31-34-38)19-37(20-29-23-39(35-32-29)17-26-12-6-2-7-13-26)21-30-24-40(36-33-30)18-27-14-8-3-9-15-27/h1-15,22-24H,16-21H2 Key: WKGZJBVXZWCZQC-UHFFFAOYSA-N
SMILES c1ccc(cc1)Cn2cc(nn2)CN(Cc3cn(nn3)Cc4ccccc4)Cc5cn(nn5)Cc6ccccc6
Properties
Chemical formula	C30H30N10
Molar mass	530.640 g·mol−1
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa). Y verify (what is YN ?) Infobox references

It is believed that the ligand promotes catalysis through the stabilization of the copper(I)-oxidation state, while still allowing for the catalytic cycle of the CuAAC reaction to proceed.

Single crystal X-ray diffraction of the Cu(I) complex of tris((1-benzyl-4-triazolyl)methyl)amine revealed an unusual dinuclear dication with one triazole unit bridging two metal centers, and is an effective catalyst for the 'click' cycloaddition reaction. The structure of the complex of TBTA with Cu(II) in the crystalline state is trigonal bipyramidal and can be reduced to the active 'click' catalyst form by sodium ascorbate, copper metal, or other reducing agents.

In the literature, it has been gaining widespread use as a biochemical tool for the tagging of proteins and enzymes. The compound is now commercially available through Sigma-Aldrich and Invitrogen. It may be prepared by the click reaction between tripropargylamine and benzyl azide:^[1][2]