Further investigation on the nitration of BODIPY with cupric nitrate: crystal structures of 4,4-di­fluoro-1,3,5,7,8-penta­methyl-2-nitro-4-bora-3a,4a-di­aza-s-indacene, 4,4-di­fluoro-3-nitro-8-phenyl-4-bora-3a,4a-di­aza-s-indacene, and 3-chloro-6-ethyl-5,7,8-trimethyl-2-nitro-4,4-diphenyl-4-bora-3a,4a-di­aza-s-indacene

Acta Crystallographica Section E: Crystallographic Communications

Joshi, D.J.¹  Jun, M.² 

[1] Department of Chemistry, Brock University, 1812 Sir Isaac Brock Way, St., Catharines, ON, L2S 3A1, Canada;Department of Chemistry, University of Toronto, Toronto, Ontario, M5S 3H6, Canada

关键词: BODIPY;    NITRATION;    CUPRIC NITRATE;    REGIOSELECTIVITY;    X-RAY CRYSTAL STRUCTURE;   

DOI  :  10.1107/S2056989017018564

学科分类：数学（综合）

来源: International Union of Crystallography

【 摘 要 】

The treatment of non-fully substituted 4,4-di­fluoro-4-bora-3a,4a-di­aza-s-indacene (BODIPY) with cupric nitrate leads to the introduction of a nitro group at different positions of the BODIPY core, depending on the substitution pattern. This methodology complements the treatment of fully substituted BODIPY with cupric nitrate that was previously reported. The crystal structures of 4,4-di­fluoro-1,3,5,7,8-penta­methyl-2-nitro-4-bora-3a,4a-di­aza-s-indacene, C14H16BF2N3O2 (5a) 4,4-di­fluoro-3-nitro-8-phenyl-4-bora-3a,4a-di­aza-s-indacene, C15H10BF2N3O2 (5b) and 3-chloro-6-ethyl-5,7,8-trimethyl-2-nitro-4,4-diphenyl-4-bora-3a,4a-di­aza-s-indacene, C26H25BClN3O2 (5d) are presented. In all three structures, the fused ring system is in a very flattened `V-shape', with dihedral angles between the two outer five membered rings of 8.12 (14), 6.67 (9) and 12.30 (18) Å for 5a, 5b and 5d, respectively. In each case, the central six-membered ring is in a flattened sofa conformation. In the crystal of 5a, mol­ecules are linked by weak C—H⋯O and C—H⋯F hydrogen bonds forming sheets parallel to (10-1). In the crystal of 5b mol­ecules are linked by weak C—H⋯O and C—H⋯F hydrogen bonds and π–π inter­actions forming sheets parallel to (001). In the crystal of 5d, weak C—H⋯O hydrogen bonds link mol­ecules into chains along [001]. In compound 5d, the atoms of the nitro group were refined as disordered over two sets of sites with occupancies 0.618 (12) and 0.382 (12).

【 授权许可】

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