Es wird ein Verfahren zum doppelten Ringschluss des3,6-Diphenyl-phtalsäureanhydridszum酮英-(2',1':1,2)-芴和异氰酸酯还原Zum Indeno-(2',1':1,2) -氟(endo-cis-Fluorenaphen VII)Angegeben。
Superelectrophilic-Initiated C–H Functionalization at the β-Position of Thiophenes: A One-Pot Synthesis of <i>trans</i>-Stereospecific Saddle-Shaped Cyclic Compounds
Superelectrophilic-initiated direct C–H functionalization of thiophenes at the β-position was developed. A series of trans-stereospecific [2,1-a]-IF-thiophene-fused cyclic compounds (4) with saddle-shaped structure were prepared in 17–30% yields through a one-pot superelectrophilic Friedel–Crafts reaction of dihydroindenofluorene with thiophene derivatives. From the crystal packing analyses of 4a, its
Serendipitous Rediscovery of the Facile Cyclization of
<i>Z</i>
,
<i>Z</i>
‐3,5‐Octadiene‐1,7‐diyne Derivatives to Afford Stable, Substituted Naphthocyclobutadienes
作者:Joshua E. Barker、Takuya Kodama、Min K. Song、Conerd K. Frederickson、Tanguy Jousselin‐Oba、Lev N. Zakharov、Jérôme Marrot、Michel Frigoli、Richard P. Johnson、Michael M. Haley
DOI:10.1002/cplu.201800605
日期:2019.6
The serendipitous isolation of very small amounts of two naphthocyclobutadiene (NCB) derivatives has led to the computational re-examination of the electrocyclization of Z,Z-3,5-octadiene-1,7-diyne as well as the experimental and computational study of diethynylindeno[2,1-a]fluorene derivatives that contain the 3,5-octadiene-1,7-diyne motif as part of a larger π-framework. In both cases the calculated
Twisted Polycyclic Aromatic Hydrocarbon with a Cyclooctatetraene Core via Formal [4+4] Dimerization of Indenofluorene
作者:Yoshito Tobe、Shunpei Nobusue
DOI:10.1055/s-0035-1562361
日期:——
A polycyclic aromatic hydrocarbon having a twisted cyclooctatetraene (COT) core was prepared by a formal [4+4] dimerization of an in situ generated indeno[2,1-a]fluorene derivative. The compound consists of two indenofluorene frameworks connected with two double bonds and adopts a twisted geometry to avoid intramolecular steric repulsion. It exhibits a long-wavelength absorption band with a maximum
Indeno[2,1-a]fluorene: An Air-Stable ortho-Quinodimethane Derivative
作者:Akihiro Shimizu、Yoshito Tobe
DOI:10.1002/anie.201101950
日期:2011.7.18
A new isomer: 11,12‐Dimesitylindeno[2,1‐a]fluorene was synthesized and isolated in crystal form. The indenofluorene exhibits significant bond‐length alternation in the o‐quinodimethane structure, limited singlet biradical character, and weakly antiaromatic character. Optical and electrochemical properties suggest that indeno[2,1‐a]fluorenederivatives may be candidates for optoelectronic materials
合成了一种新的异构体:11,12-二甲双胍[2,1- a ]芴,并以晶体形式分离出。茚并芴在邻喹啉甲烷结构中具有明显的键长交替,有限的单线双自由基特性和弱的芳香性。光学和电化学性质表明,茚并[2,1- a ]芴衍生物可能是光电子材料的候选者。