Synthesis and Properties of the 1,2,SThiadiborol SystemCleavage of 1.4-diborin derivatives 1 a and 2a by triiodoborthiin, redox reactions between o-diiodoarenes, triiodoborane and sulfur, and cyclisation of aryldiiodoboranes with triiodoborthiin lead to the formation of the thiadiborol derivatives 31 and 4a. These iodo compounds are converted by redox reactions and ligand exchange into the corresponding Br, C1, SCH3 and CH, derivatives. The halogen compounds form I : I and 2: 1 donor-acceptorcomplexes with the Lewis base (CH3)zS. Substitution of the sulfur by amine-and hydrazine derivatives yields the heterocycles BzC~N, 10, and BzCzNz, 12.
W a l t e r S i e b e r t , K l a u s -J u e r g e n S c h a p e r u n d B a g h e r A s g a r o u l a d i I n s titu t für Anorganische Chemie der U n iv ersität W ürzburg Triiodoborane, Diborylarenes O f th e three diiodobenzenes th e 1,3-and 1,4-isomer react w ith B I 3 to give th e cor responding bis(diiodoboryl)benzenes. D ue to th e electronic acceptor properties of th e B I 2-group th e form ation of th e 1,3-isomer is favored over th e 1,4-product. A tte m p ts to p repare th e l,2-bis(diiodoboryl)benzene resulted in th e form ation of a dibenzo-1,4-diborine derivative.
Durch Kondensation des Dijodbenzols (I) bzw. des Thiophens (IV) mit" B13 wurden die Diborine (II) und (V) dargestellt, die mit Trijodborthiin "in die [auch direkt aus (I) bzw. (IV), B13 und Schwefel zugänglichen] Thiadiborole (III) bzw. (VI) gespalten werden konnten.
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