Beiträge zur Chemie des Bors, 125. Über ein Addukt von 4,6‐Dibrom‐1,2,3,5,4,6‐tetrathiadiborinan mit 1,2,3‐Trimethyl‐1,3,2‐diazaborolidin

Contributions to the Chemistry of Boron, 125. An Adduct of 4,6‐Dibromo‐1,2,3,5,4,6‐tetrathiadiborinane with 1,2,3‐Trimethyl‐1,3,2‐diazaborolidine The exchange of substituents between 3,5‐dibromo‐1,2,4,3,5‐trithiadiborolane ( 1 ) and 1,2,3‐trimethyl‐1,3,2‐diazaborolidine ( 2 ) proceeds via formation of adducts as indicated by tetracoordinated boron atoms but definite products could not be isolated. However, a well defined crystalline adduct was obtained in low yield using aged and somewhat impure 1 . X‐ray analysis showed it to be a 1:1 adduct 6 between 2 and the new heterocycle 4,6‐dibromo‐1,2,3,5,4,6‐tetrathiadiborinane containing tetracoordinate boron atoms exclusively.