4,4,5,5-tetramethyl-1,3,2-dioxa-borolane is a chemical compound with the molecular formula C8H21BO2. It is a boron-containing heterocycle with tetramethylated oxygen atoms. This compound is commonly used in organic synthesis as a versatile reagent for various transformations due to its unique structure and reactivity. The boron center imparts distinct properties, making it valuable in synthetic chemistry applications.