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Description
TCI D3566 5'-O-(4,4'-Dimethoxytrityl)thymidine is a protected nucleoside that serves as an essential starting material in oligonucleotide synthesis. The molecule is thymidine in which the hydroxyl group at the 5' position has been protected by a dimethoxytrityl group, while the 3' hydroxyl group is left free. This selective protection is precisely what makes directed assembly of DNA chains possible, because each coupling step can only occur at one planned position. In the laboratory, this material is the point of departure for preparing phosphoramidites and for attaching nucleosides to solid supports.
The property that makes this compound especially valuable is the character of the dimethoxytrityl group, which is labile toward weak acid yet stable under basic and neutral conditions. The group can be removed rapidly and cleanly with dilute acid solution, and the trityl cation that is formed has a characteristic color, so the efficiency of every coupling cycle can be monitored quantitatively through absorbance measurement. This capacity for direct monitoring is what has established the dimethoxytrityl strategy as the standard in automated oligonucleotide synthesis. The large size of the protecting group additionally blocks side reactions at the 5' position.
In Indonesian laboratories, this reagent is typically used by research groups and service facilities engaged in nucleic acid chemistry, molecular biology support work, and the in-house preparation of synthetic DNA building blocks. It is handled as a bench-scale synthetic intermediate, weighed out for phosphoramidite preparation or solid-support loading, and its color-based coupling readout makes it well suited to teaching and method-development settings where each synthetic cycle needs to be verified rather than assumed.
Laboratory Applications
Phosphoramidite preparation: the free 3' hydroxyl group is available for phosphitylation while the 5' position stays protected, giving a clean single-site reaction for building synthesis-ready monomers.
Solid-support loading: the compound serves as the starting nucleoside attached to a solid support, establishing the defined 3' anchor point from which the oligonucleotide chain is extended.
Automated oligonucleotide synthesis: acid-labile yet base-stable protection fits standard synthesis cycles, allowing repeated deprotection and coupling steps without disturbing other functional groups.
Coupling efficiency monitoring: removal of the dimethoxytrityl group releases a characteristically colored trityl cation, so absorbance measurement gives a quantitative stepwise yield for each cycle.
Directed DNA chain assembly: selective protection of only the 5' hydroxyl ensures each elongation step proceeds at a single planned position, preventing uncontrolled branching or side reaction.
Specifications
Brand: TCI
CAS number: 40615-39-2
Category: Chemistry > Building Blocks > Heterocyclic Building Blocks
Chemical name: 5'-O-(4,4'-Dimethoxytrityl)thymidine
Pack sizes: available in standard TCI catalogue pack sizes; please confirm the required quantity when ordering
Storage: store in a closed container under the conditions stated on the manufacturer's label
Handling and Storage
Keep the container tightly closed and store it in a cool, dry place away from moisture, direct sunlight, and sources of acid, since the dimethoxytrityl protecting group is sensitive to acidic conditions. Original manufacturer packaging or a tightly sealed amber glass container is suitable, and transfers are best carried out in a dry environment to limit exposure to atmospheric humidity. Handle the material in a fume hood using gloves, safety glasses, and a laboratory coat, and weigh it with clean, dry spatulas to avoid cross-contamination. Always consult the manufacturer's safety data sheet before use, and dispose of residues and contaminated consumables through the laboratory's chemical waste procedure.
