781-92-0Relevant articles and documents
Hyperconjugative and Inductive Perturbations in Poly(p-phenylene vinylenes)
Kim, Youngmi,Zhu, Zhengguo,Swager, Timothy M.
, p. 452 - 453 (2004)
New polymers having high solid-state fluorescence quantum yields and the ability to tune their electron affinity without effecting their band gap using hyperconjugative interactions is reported. The novel three-dimensional poly(phenylene vinylenes) having [2.2.2] bicyclic ring systems shown were synthesized, and the different hyperconjugative perturbations provide differential fluorescence sensory quenching responses to electron-rich and electron-deficient analytes in solution and solid thin films. Copyright
BF3-H2O catalyzed hydroxyalkylation of aromatics with aromatic aldehydes and dicarboxaldehydes: Efficient synthesis of triarylmethanes, diarylmethylbenzaldehydes, and anthracene derivatives
Prakash, G. K. Surya,Panja, Chiradeep,Shakhmin, Anton,Shah, Eric,Mathew, Thomas,Olah, George A.
supporting information; experimental part, p. 8659 - 8668 (2009/12/30)
(Figure Presented) BF3-monohydrate is found to be an efficient and strong acid catalyst as well as an effective protosolvating medium suitable for the hydroxyalkylation of arenes with aromatic aldehydes. This reaction has been extended to aromatic dialdehydes, such as terephthalic dicarboxaldehyde and isoterephthalic dicarboxaldehyde, for the efficient synthesis of diarylmethylbenzaldehydes, which are useful synthons for various organic transformations. Further, successful one step convergent synthesis of various synthetically useful anthracene derivatives from phthalaldehyde was also achieved. BF3-H2O is less expensive and acts as an efficient substitute for nonoxidizing strong protic acids/superacids.
Chemical syntheses of syn- and anti-1,2;3,4-diepoxides derived from 1,4-dimethyl-and 1,2,3,4-tetramethylanthracenes and naphthalenes
Rigaudy, Jean,Lachgar, Mohamed,Caspar, Alain,Chassagnard, Claude
, p. 481 - 490 (2007/10/03)
Chemical isomerization of 1,4-endoperoxides 1a,b,n derived from meso-unsubstituted 1,4-dimethyl- or 1,2,3,4-tetramethylanthracenes (and naphthalenes) to syn-1,2;3,4-diepoxides 2a,b,n has been achieved by treatment at room temperature with FeSO4 in CH3CN containing pyridine. With analogous 9,10-diphenyl derivatives 1c,d, heating appears necessary and the same isomerization is then superseded by another type of rearrangement leading to dihydronaphthoxanthenols 4c,d. An electron-exchange mechanism may explain the difference between both series. In contrast, the isomeric anti-1,2;3,4-diepoxides 19b,c,d,n have been prepared by direct epoxidation of the hydrocarbons 18a-d,n with dimethyldioxirane generated in situ. In this case, the reaction is more efficient for 9,10-diphenyl derivatives 18c,d than for meso-unsubstituted ones 18a,b as the latter can undergo competitive oxidations at meso-positions leading to 10-hydroxy-9-anthrones 22a,b at the same time as anthraquinones 23a,b. Elsevier.
