Influence of the anion nature on styryl dye crystal packing and feasibility of the direct and back [2 + 2] photocycloaddition reactions without single crystal degradation
Synthesis, structure, and stereospecific cross-[2+2] photocycloaddition of pseudodimeric complexes based on ammonioalkyl derivatives of styryl dyes
作者:Sergey P. Gromov、Artem I. Vedernikov、Sergey K. Sazonov、Lyudmila G. Kuz’mina、Natalia A. Lobova、Yuri A. Strelenko、Judith A. K. Howard
DOI:10.1039/c5nj03500g
日期:——
Two different styryl dyes form pseudodimeric complexes via hydrogen bonding and stacking interactions; irradiation of these complexes gives rctt-cyclobutane derivatives.
Design of crystal packings of styrylheterocycles and [2+2] photocycloaddition reactions in their single crystals 6. Synthesis and crystal packings of neutral crown-containing and model styrylheterocycles
作者:L. G. Kuz’mina、A. I. Vedernikov、N. A. Lobova、S. K. Sazonov、S. S. Basok、J. A. K. Howard、S. P. Gromov
DOI:10.1007/s11172-009-0155-7
日期:2009.6
Neutral crown-containing and model styrylheterocycles of the 4-pyridine, 4-quinoline, and 9-acridine series were synthesized under acidic catalysis. The influence of the molecular geometry of these compounds, as well as of related styrylheterocycles of the 2-benzothiazole and benzobisthiazole series, on the formation of a particular crystal packing was investigated based on X-ray diffraction data. An extension of the conjugation system in the molecules can result in the sandwich-herringbone packing motif as the only one of the three packing motifs most typical of this class of compounds. This packing provides the preorganization of the structural units for the [2+2] photocycloaddition reaction. The styrylheterocycle containing the bulky 9-acridine moiety is nonplanar due to strong intramolecular steric interactions. The packing motifs formed by nonplanar molecules do not provide the preorganization of the molecules for the [2+2] photocycloaddition. The introduction of the crown ether moiety into the benzene ring of the styrylheterocycle can decrease the predictability of the packing motif as a result of the inclusion of solvent molecules capable of hydrogen bonding with the heteroatoms of the macrocycle in the crystal structure.
Styryl dyes. Synthesis and study of the solid-state [2+2] autophotocycloaddition by NMR spectroscopy and X-ray diffraction
作者:A. I. Vedernikov、L. G. Kuz’mina、S. K. Sazonov、N. A. Lobova、P. S. Loginov、A. V. Churakov、Yu. A. Strelenko、J. A. K. Howard、M. V. Alfimov、S. P. Gromov
DOI:10.1007/s11172-007-0289-4
日期:2007.9
benzene fragment of styryldyes extend the range of the mutual orientations of the molecules in the dimeric pairs, resulting in the formation of two or even four isomeric cyclobutanes in the PCA reactions. The structures of somedyes were established by X-ray diffraction. In the overwhelming majority of the structures, one of two packing modes, either syn-head-to-tail or syn-head-to-head, with extensive
Synthesis and structures of azine-based crown-containing hetarylphenylethenes
作者:E. N. Andryukhina、M. M. Mashura、O. A. Fedorova、L. G. Kuz'mina、J. A. K. Howard、S. P. Gromov
DOI:10.1007/s11172-006-0025-5
日期:2005.7
Condensation of methyl-substituted six-membered heteroaromatics containing one or two nitrogen atoms with aldehyde derived from benzo-15-crown-5 ether in DMF in the presence of ButOK afforded 15-crown-5-containing hetarylphenylethenes. According to the results of NMR spectroscopy, these compounds exist as mixtures of syn and anti conformers in solution (MeCN-d3). The structures of two compounds were established by X-ray diffraction analysis.
甲基取代的含一个或两个氮原子的六元杂芳香族化合物与苯并-15-冠醚衍生的醛在 DMF 和 ButOK 的存在下缩合,得到了含有 15-冠-5-的 hetarylphenylethenes。根据核磁共振光谱的结果,这些化合物在溶液(MeCN-d3)中以同构和反构的混合物形式存在。通过 X 射线衍射分析确定了两种化合物的结构。
Design of crystal packings of styrylheterocycles and [2+2] photocycloaddition reactions in their single crystals 7. Crystal structures of 4-styrylpyridine hydroperchlorates and solid-state [2+2] autophotocycloaddition reactions of these compounds
作者:L. G. Kuz’mina、A. I. Vedernikov、S. K. Sazonov、N. A. Lobova、A. V. Churakov、E. Kh. Lermontova、J. A. K. Howard、M. V. Alfimov、S. P. Gromov
DOI:10.1007/s11172-011-0259-8
日期:2011.8
4-tetrasubstituted cyclobutanes was investigated. Unlike neutral styrylpyridines, their protonated forms are better preorganized for the solid-state PCA reaction. According to the X-ray diffraction data, the cations of these compounds, like related styryl dyes, are mainly stacked in crystals in a head-to-head or head-to-tail fashion with equal probability. Only in the latter type of stacks, the PCA