Oxypentyl-modified Nucleoside Phosphoramidites are designed for the synthesis of oligonucleotides containing a thermolabile 3'-blocking group, which prevents primer hybridization and extension at low temperatures and is automatically removed during high-temperature activation.

Oligonucleotides synthesized using these phosphoramidites function as built-in hot-start primers, eliminating premature annealing and nonspecific extension during reaction setup and thermal cycling.

Key features:

• Temporary 3′-blocking with thermal removal
• Suppression of nonspecific primer binding
• Reduction of dimer formation
• Compatibility with standard oligonucleotide synthesizers

Oxypentyl phosphoramidites provide a chemical approach to hot-start PCR, allowing precise control of primer activity without the use of modified enzymes.