1-Ethynyl-dSpacer CE Phosphoramidite


Product Specifications

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1-Ethynyl-dSpacer CE Phosphoramidite can be used in any position within an oligonucleotide while still retaining the high efficiency of click chemistry. The modifier is efficiently incorporated into oligonucleotides using standard phosphoramidite chemistry, is stable to common deprotection conditions, and is compatible with Glen-Pak™ purification. 1-Ethynyl-dSpacer generates a substituted 1,2,3-triazole pseudo-nucleobase after click chemistry conjugation with an azide The 1-ethynyl-dSpacer modification exhibits similar duplex stability to the standard dSpacer (10-1914) and destabilizes the duplex when internally incorporated. Upon cycloaddition, the duplex stability is moderated by the resulting structure of the modification. Simple 1,2,3-triazoles were destabilizing, as were modifications that incorporated TEG linkers (6-FAM-TEG and Amino-TEG). Modifications that incorporated aromatic functional groups restored duplex stability to varying degrees with coumarin and psoralen significantly restoring stability. A 5’-iodo-modified oligonucleotide (prepared using 5’-Iodo-dT) can be quantitatively converted to the corresponding 5’-azide



  • Coupling: No changes needed from standard method recommended by synthesizer manufacturer.
  • Deprotection: Compatible with all standard deprotection conditions. Best results are obtained with AMA, 65°C, 10 minutes.
Diluent Anhydrous Acetonitrile
Storage Refrigerated storage, maximum of 2-8°C, dry
Stability 1-2 days

Dilution/Coupling Data

The table below show pack size data and, for solutions, dilution and approximate coupling based on normal priming procedures.

ABI 392/394

Catalog # Pack Size Grams/Pack 0.1M Dil. (mL) Approximate Number of Additions
LV40 LV200 40nm 0.2μm 1μm 10μm
10-1910-02 0.25 g .25grams 3.88 116 69.6 43.5 31.64 23.2 5.8
10-1910-90 100 µmol .064grams 1 20 12 7.5 5.45 4 1
10-1910-95 50 µmol .032grams 0.5 3.33 2 1.25 0.91 0.67 0.17


Catalog # Pack Size Grams/Pack Dilution (mL) Approximate Number of Additions
Molarity 50nm 0.2μm 1μm 15μm
10-1910-02 0.25 g .25grams 5.79 0.07 109.4 68.38 49.73 6.84
10-1910-90 100 µmol .064grams 1.5 0.07 23.6 14.75 10.73 1.48
10-1910-95 50 µmol .032grams 0.75 0.07 8.6 5.38 3.91 0.54