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4,4,5,5-tetramethyl-2-(spiro[2.5]oct-5-en-6-yl)-1,3,2-dioxaborolane; CAS No.: 859219-46-8; This spirocyclic boronate ester highlights our capabilities in strained hydrocarbon systems. The unique spiro[2.5]octene structure induces torsional strain that can be leveraged in transition metal catalysis. ChemShuttle's custom synthesis services include optimization of ring-closing metathesis conditions for these challenging small-ring systems.