MMT-Hexylaminolinker Phosphoramidite is primarily used in the synthesis of oligonucleotides, where it serves as a crucial reagent for introducing amino-modified groups into DNA or RNA sequences. This modification is essential for creating functionalized oligonucleotides that can be further conjugated with various molecules, such as fluorescent dyes, biotin, or other ligands, enabling applications in molecular biology and diagnostics. It is particularly valuable in the development of probes for hybridization assays, microarray technologies, and therapeutic oligonucleotides, where precise labeling and targeting are required. The MMT protecting group ensures selective deprotection during synthesis, allowing for controlled and efficient modification of the oligonucleotide chain.