Synthesis and cycloreversion of benzocyclobutene- and benzocyclobutadiene-anthracene adducts
作者:Keiji Okada、Hideki Kawai、Masaji Oda
DOI:10.1016/0040-4039(92)88065-d
日期:1992.1
The [4+2]-cycloadducts of anthracene and benzocyclobutene or benzocyclobutadiene were synthesized and their cycloreversion was investigated.
合成了蒽与苯并环丁烯或苯并环丁二烯的[4 + 2]-环加合物,并研究了它们的环还原反应。
The Elusive Benzocyclobutenylidene: A Combined Computational and Experimental Attempt
作者:Athanassios Nicolaides、Takeshi Matsushita、Kohichi Yonezawa、Shinji Sawai、Hideo Tomioka、Louise L. Stracener、Jonathan A. Hodges、Robert J. McMahon
DOI:10.1021/ja0039482
日期:2001.3.1
Ab initio and density functional theory calculations predict that benzocyclobutenylidene (1) has a singlet ground state in contrast to the parent phenylcarbene and many other simply substituted arylcarbenes. Calculations also predict that 1 should lie in a relatively deep potential well, while its tripler state is 14.5 kcal mol(-1) higher in energy. However,:attempts to observe 1 directly by photolysis of two different nitrogenous precursors were not successful. Irradiation of diazobenzocyclobutene (7) (lambda > 534 nm or lambda > 300 nm) or azibenzocycllobutene (10) (lambda > 328 nm) in Ar matrixes at 10 K leads to the formation of the strained cycloalkyne 7-methylenecyclohepta-3,5-dien-1-yne (3). C-13-Labeled 3 was also prepared in a similar manner. There is very good agreement between experimental IR spectra and computationally derived harmonic vibrational frequencies for 3 and [C-13]-3 and excellent agreement between observed and calculated isotopic shifts. Prolonged short-wavelength irradiation converts 3 into benzocyclobutadiene (5). Phenylacetylene (6) and benzocyclo- butadiene dimer (11) were identified as products arising from flash vacuum pyrolysis of diazirine 10 at 500 degreesC.
Photochemical and thermal denitrogenations of azoalkanes as mechanistic probes for the diradical intermediates involved in the di-.pi.-methane rearrangement of dibenzobarrelene
作者:Waldemar Adam、Ottorino De Lucchi、Karl Peters、Eva Maria Peters、Hans Georg Von Schnering
DOI:10.1021/ja00385a032
日期:1982.10
Banciu, Mircea D.; Pop, Mircea; Petride, Aurica, Revue Roumaine de Chimie, 1991, vol. 36, # 8, p. 907 - 916
作者:Banciu, Mircea D.、Pop, Mircea、Petride, Aurica、Stanescu, Michaela Dina
DOI:——
日期:——
Unsaturated eight-membered ring compounds. X. 1,2,3,4,7-cyclooctapentaene, a possible intermediate in the conversion of cis,cis-3,5-octadiene-1,7-diyne to benzocyclobutadiene dimer